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Contact Info
Home:
Ferdi Hellweger
235 Commonwealth Avenue, #7
Boston, MA 02116
(917) 238-3010
Office:
Ferdi Hellweger
400 Snell Engineering Center
Northeastern University
Boston, MA 02115
Phone: (617) 373-3992
Fax: (617) 373-4419
Email: ferdi@coe.neu.edu
Education
Employment History
Northeastern University, 2004 - Present
Civil and Environmental Engineering Department
Northeastern University, Boston, Massachusetts
Last/Current Rank: Assistant Professor
Associate Director, Center for Urban Environmental Studies
HydroQual, 1997 - 2004
Environmental Engineering Consulting Firm
HydroQual, Inc., Mahwah, New Jersey
Last/Current Rank: Project Manager
Center for Research in Water Resources, 1995 - 1997
University Research Center
CRWR, Austin, Texas
Cochrane Associates, 1992 - 1995
Environmental Engineering Consulting Firm
Cochrane Associates, Inc., Boston, Massachusetts
Cambridge DPW, 1992
Department of Public Works, Engineering and Sewer Division
City of Cambridge, Cambridge, Massachusetts
WARTIG, Summer 1990, 1991
Environmental Chemistry Consulting Firm
WARTIG Chemieberatung GMBH, Hamburg, Germany
Research Experience
The general problem area of my research at Columbia University was the cycling of elements in the environment. Specifically, I was investigating the transformation of arsenic by phytoplankton, which is the predominant process affecting arsenic speciation in oxygenated surface waters. The major contributions of my PhD research are: (1) the establishment of a link between the phosphorus luxury uptake mechanism of algae and arsenic transformation, and the development of a model for the process; and (2) the development of a novel ecological model that accounts for variable phytoplankton composition (i.e. not Redfield) and “luxury uptake” of nutrients. At UT Austin, my research was focused on surface hydrology and non-point source pollution, and the use of geographic information system (GIS) technology in these areas. I have also participated in several research projects at HydroQual. These include investigating the effect of chemical properties on the long-range transport and deposition potential of persistent, bioaccumulative and toxic chemicals (PBTs); and investigating the potential for pharmaceuticals to enter drinking water supplies on a national scale. I am the PI for EPRI’s (Electric Power Research Institute) MARS (Model for the Assessment and Remediation of Sediments) model. I have also participated in the development of a methodology to estimate the toxicity of non-aqueous phase liquids (NAPLs), like coal tar and crude oil, in sediment and water.
Teaching Experience
Description
While an undergraduate student at Northeastern University, I served as TA for a fluid mechanics undergraduate course for two years. At UT Austin, I served as TA for a geographic information system (GIS) graduate course and several continuing education courses on the use of the HEC-RAS model. I have taught five short courses (three full day) on the application of GIS technology to water quality problems at meetings of the Society of Environmental Toxicology and Chemistry (SETAC). I have taught at Manhattan College’s Institute for Water Pollution Control, Water Quality Modeling Section for three years. Recently, I instructed on the use of models in a full-day pre-conference workshop entitled “Assessment and Remediation of Contaminated Sediments” at the national SETAC meeting. I have also taught in a classroom setting as part of training and marketing efforts for HydroQual. This included a 1-week training course on the use of an environmental information system in Bolivia. Other topics included prediction of the toxicity of organic chemicals and metals in water and sediment, hydrodynamic and sediment transport, and contaminant fate and transport modeling. My teaching evaluations have always been very positive.
Courses
Hellweger, F. L., 2007. Environmental Engineering I, Undergraduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2007. Surface Water Hydraulics and Quality Modeling, Graduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2006. Hydrology, Graduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2006. Sr. Design Proj-General (aka Capstone), Undergraduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2005. Hydrology, Graduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2005. Surface Water Hydraulics and Quality Modeling, Graduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Hellweger, F. L., 2004. Hydrologic Engineering, Undergraduate course, Northeastern University, Boston, Massachusetts.
[ Syllabus (PDF) ]
Di Toro, D., R. Mutch, C. Ingersoll, K. J. Farley, J. McGrath, and F. L. Hellweger, 2003. Characterization and Remediation of Contaminated Sediments. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Austin, Texas.
[ Abstract ]
Di Toro, D. M., K. J. Farley, F. L. Hellweger, and P. Paquin, 2003. Water Quality Modeling. 48th Institute on Water Pollution Control. Manhattan College, Riverdale, New York.
Hellweger, F. L., D. Ames, J. Rowe, W. Saunders, and J. Horsburgh, 2002. Application of Geographic Information System (GIS) Technology to Water Quality Problems. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Salt Lake City, Utah.
[ Abstract ]
Hellweger, F. L., W. Saunders, and G. Carter, 2001. Application of Geographic Information System (GIS) Technology to Water Quality Problems. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Baltimore, Maryland.
[ Abstract ]
[ JPG ]
Hellweger, F. L., 2001. Geographic Information System (GIS). Annual Meeting, Hudson-Delaware Chapter, Society of Environmental Toxicology and Chemistry (SETAC), West Chester, Pennsylvania.
[ Abstract ]
Hellweger, F. L., G. M. Ostroff, E. M. Naranjo, and W. Wheaton, 2000. Application of Geographic Information System (GIS) Technology to Water Quality Problems. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Nashville, Tennessee.
[ Abstract ]
Hellweger, F. L., 2000. Geographic Information System (GIS). Annual Meeting, Hudson-Delaware Chapter, Society of Environmental Toxicology and Chemistry (SETAC), Stockton, New Jersey.
[ Abstract ]
Lectures
Hellweger, F. L., 2004. Urban Drainage Design. Senior Design Project. Undergraduate course (Prof. Wang), Northeastern University, Boston, Massachusetts.
Hellweger, F. L., 2004. Urban Hydrology for Small Watersheds (TR-55). Hydrology. Graduate course (Prof. Novotny), Northeastern University, Boston, Massachusetts.
Hellweger, F. L., 2004. Arsenic speciation in surface water. Water Quality Modeling. Graduate course (Prof. Chapra), Tufts University, Medford, Massachusetts.
Hellweger, F. L., 2003. Introduction to Spatial Hydrologic Calculations. Physical Hydrology. Graduate course (Prof. Lall, E6240), Columbia University, New York, New York.
Hellweger, F. L., 2002. Introduction to BASINS & GIS. Summer Institute, Manhattan College, Riverdale, New York.
Hellweger, F. L., 2000. Toxic chemical modeling using GIS. Summer Institute, Manhattan College, Riverdale, New York.
Hellweger, F. L., 1999. GIS Applications to Environmental Problems. Undergraduate course (Prof. Gorokhovich, E1001), Columbia University, New York, New York.
Hellweger, F. L., 1999. Introduction to Programming. Undergraduate Course (Prof. Assaf-Anid, ENGS-116), Manhattan College, Riverdale, New York.
Independent Studies
Hellweger, F. L., 2004. Modeling Water Quality in Drinking Water Distribution Networks. Graduate course, Northeastern University, Boston, Massachusetts.
Hellweger, F. L., 2004. Literature Review on Fecal Contamination Indicators: Spatial and temporal variability. Graduate course, Northeastern University, Boston, Massachusetts.
Consulting Experience
Description
I have ten years of experience as an environmental engineering consultant (3 years at Cochrane Associates and 7 years at HydroQual). My recent focus has been on analyzing the fate, transport, bioaccumulation and potential toxic effects of substances of concern in the aquatic environment. I have participated, and served as technical and project manager, in numerous projects for government and industry in the U.S. and abroad. Those projects have addressed a diverse range of chemicals including polychlorinated biphenyls (PCBs), monoaromatic hydrocarbons (BTEX), polyaromatic hydrocarbons (PAHs), aliphatic hydrocarbons, dioxins and metals. Water bodies examined include the Passaic River, Ajkwa River and Arafura Sea (Indonesia), Delaware Estuary, Hudson River, Hudson Estuary, Fox River, Lavaca Bay, New Bedford Harbor, Susquehanna River and Prince William Sound. Contamination scenarios investigated include legacy sediment pollution (Superfund), accidental releases (i.e. oil spills) and contemporary point and non-point source discharges (Total Maximum Daily Loads, TMDLs). I have applied existing models (e.g. WASP), authored new models (SIA, GISTOX, MARS, NAPLTOX) and evaluated models developed and applied by other parties. Recently, I served as project manager representing a coalition of point source dischargers (Amtrak, Camden, DuPont, Exelon, Motiva, Oxy, Philadelphia, PSE&G, Rohm & Haas, Valero) in the development of a TMDL for PCBs in the Delaware Estuary.
Past Clients
Aluminum Company of America (ALCOA);
Amherst (Town of), MA;
Amtrak;
Bolivian Mining Ministry;
Boston Edison;
Camden County Municipal Utilities Authority;
Central Hudson Gas & Electric (CHG&E) ;
Consolidated Edison (ConEdison);
Daddario, Francis D. (Developer);
Dartmouth (Town of), MA;
Dow Corning;
DuPont;
Electric Power Research Institute (EPRI);
Exelon Power;
ExxonMobil;
Fairhaven (Town of), MA;
Freeport McMoRan;
General Electric (GE) ;
Mansfield (Town of), MA;
MeadWestvaco Co. ;
Motiva Enterprises LLC;
New York State Gas & Electric (NYSEG) ;
North Attleboro (Town of), MA;
Oxy (Occidental Petroleum Co);
Pfizer;
Philadelphia (City of);
Plymouth (Town of), MA;
Public Service Electric & Gas (PSE&G);
Revere Copper Products;
Rohm & Haas;
Suffield (Town of), CT;
Sunoco;
U.S. EPA;
U.S. FWS;
Valero Energy Co.;
Webster (Town of), MA;
Wisconsin DNR;
Wisconsin Energies (WE) ;
Woonsocket (City of), RI;
Selected Projects
Title: Lower Passaic River Toxic Chemical Fate and Transport
Client: US EPA
The Lower Passaic River, New Jersey, is surrounded by one of the earliest industrial centers of the US. As a result the sediment bed in the river is contaminated with a variety of pollutants, including dioxins, polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs) and various metals (e.g. Hg, Cd). Portions of the river have been listed on the National Priorities List (NPL, Superfund). To understand the contribution of the various sources (sediment bed, storm sewers, combined sewer overflow, nonpoint sources, atmospheric flux) to concentrations in the water column, preliminary mass balance modeling is being conducted. This includes estimating inventories and mass fluxes for each pollutant. Future work will include time-variable, high resolution hydrodynamic, sediment transport and chemical fate and transport modeling.
Title: New Bedford Harbor Copper Fate and Transport
Client: Revere Copper Products, Inc.
Past and possibly ongoing discharges of copper from a copper mill have potentially contaminated the sediments of New Bedford Harbor, Massachusetts. A single sediment sample with elevated concentrations of copper has raised concern over the potential for more widespread contamination and raised questions about the source the copper. To answer those questions a more comprehensive sampling plan was designed to characterize the extent of contamination and gain insights into the source of the copper. The toxicity of copper is being addressed by accounting for the bio-availability of copper in the sediments (SEM/AVS) and water column (BLM).
Title: Delaware Estuary PCB Fate and Transport
Client: Delaware River TMDL Coalition (Amtrak, Camden, DuPont, Exelon, Motiva, Oxy, Philadelphia, PSE&G, Rohm & Haas, Valero)
Past and present inputs of polychlorinated biphenyls (PCBs) into the Delaware Estuary have lead to ambient concentrations in excess of criteria values. To develop a total maximum daily load (TMDL) and wasteload allocations (WLAs) a PCB fate and transport model is being developed by another party. To verify that the model properly accounts for the interaction with the sediment bed (a reservoir of PCBs) it is used to simulate the long-term decadal scale PCB dynamics in the system. Data for the long-term simulation are compiled to construct forcing functions and ambient concentrations for calibration/validation.
Title: Tarrytown Harbor PAH Fate and Transport
Client: Consolidated Edison Company of New York (Con Edison)
Past discharge of coal tar from former manufactured gas plant (MGP) operations have contaminated the sediments of Tarrytown Harbor, New York with polyaromatic hydrocarbons (PAHs). To predict the concentration of PAHs under various management alternatives a model was constructed. The model consists of hydrodynamic, sediment transport and PAH fate and transport sub-models. Various remediation scenarios are currently being evaluated.
Title: Prince William Sound Crude Oil Toxicity
Client: Confidential Industrial Client
The grounding of the T/V Exxon Valdez in Prince William Sound, Alaska has caused large quantities of crude oil to be released to the environment. There are concerns and questions about the past and present effect of the crude oil and associated constituents (polyaromatic hydrocarbons, PAHs) on the ecology of the sound. However, the aquatic toxicity of crude oil is poorly understood. In this project a methodology for predicting the toxicity of crude oil was developed. The model accounts for dissolution of individual PAHs from the crude oil (Raoult’s Law) and their combined narcotic toxic effect. The methodology was validated against laboratory and field data from Prince William Sound.
Title: Newburgh Bay PAH Fate and Transport
Client: Central Hudson Gas & Electric Corporation
Past discharge of coal tar from former manufactured gas plant (MGP) operations have contaminated the sediments of the Newburgh Bay, New York with polyaromatic hydrocarbons (PAHs). To predict future concentrations under various management scenarios (e.g. no action, capping) a fate and transport model was developed. The model consists of hydrodynamic, sediment transport and PAH fate and transport sub-models. The model was used to predict the concentration for no action and various capping scenarios. In this application localized concentrations were sufficiently to adversely affect benthic biota, which reduced bioturbation mixing and slowed the rate of natural attenuation.
Title: Irian Jaya, Indonesia Copper Fate and Transport
Client: Freeport-McMoRan Copper & Gold
Large quantities of processed ore (tailings) are discharged from a mine to the Ajkwa River, which discharges into the Arafura Sea. High concentrations of copper in the tailings have prompted an analysis of the ecological and human health risk in the area. To predict future concentrations of copper and associated risk, a model was developed. The model simulates the fate and transport of copper in the river and estuary system. The time-variable model is one-dimensional in the river portion and three-dimensional in the estuary. The sediment bed is modeled using a three-layer sediment bed model. Processes modeled include copper sorption to solids, settling of solids, oxidation of copper sulfide and mineral copper (chalcopyrite) and copper binding to acid-volatile sulfide (AVS).
Title: Susquehanna River PAH Fate and Transport
Client: New York State Electric and Gas (NYSEG)
Past discharge of coal tar from former manufactured gas plant (MGP) operations have contaminated the sediments of the Susquehanna River, New York with polyaromatic hydrocarbons (PAHs). To analyze the future fate and transport of PAHs, a model was constructed. The model consisted of hydrodynamic, sediment transport and chemical fate and transport sub-models. Sediment bed concentrations of fluoranthene were predicted ten years into the future for different management scenarios (e.g. natural attenuation). One of the scenarios modeled was the removal of an ongoing source. Fluoranthene was advected by groundwater from the land portion of the site to the sediment bed of the river.
Title: A GIS Based Toxic Chemical Model (GISTOX)
Client: US EPA
EPA’s BASINS modeling framework for the development of total maximum daily loads (TMDLs) does not account for the important fate and transport processes affecting toxic chemicals (e.g. sorption, bioaccumulation). For this purpose a GIS based toxic chemical model was developed. The project included developing a geographic information system (GIS) interface for EPA's WASTOX model. WASTOX is an established toxic chemical fate and transport and bioaccumulation model. The system developed as part of this project, called GISTOX, is compatible with and utilizes data from EPA's BASINS system.
Title: Fox River Sediment Erosion
Client: Wisconsin Electric (WE Energies)
Past discharge of coal tar from former manufactured gas plant (MGP) operations have contaminated the sediments of the Fox River, Wisconsin with polyaromatic hydrocarbons (PAHs). This project addressed the concern of export of PAH contaminated sediments from the site to downstream, uncontaminated areas. A hydrodynamic model of a portion of the river was constructed used to calculate shear stresses at the water column-sediment bed interface during extreme flow events (e.g. 100-year flood). The shear stresses were used in a non-cohesive sediment erosion calculation. The output consisted of a qualitative description of the likelihood of sediment erosion during extreme events.
Title: Bolivia Environmental Information System
Client: COMIBOL, Bolivian Mining Commission
Mining of metals is often associated with discharge of pollutants to the environment. This can, for example, include discharge of processed ore (tailings) containing elevated concentrations of metals. To predict the impact of past, present and future mining activities to the environment a tool is required. This project included setting up a geographic information system (GIS), compiling existing data, and developing screening-level environmental models. Three models were developed to estimate metal concentrations in surface water, air and groundwater. The models are based on established modeling frameworks. The surface water model, for example, is based on EPA's WASTOX program. All the models are integrated into the graphical user interface (GUI) of the GIS.
Title: Long-Range Transport and Deposition - The Role of Henry's Law Constant
Client: European Chemical Industry Council
Many persistent organic pollutants (POPs), like DDT and PCBs, can travel long distances through the atmosphere and condense out at the colder high latitude regions. For screening purposes, it is important to understand the potential of a chemical to exhibit this behavior. This project involved quantifying the effect of Henry's Law constant on the long-range transport and deposition of potential POPs. Two simple screening-level models (puff and continuous release) were developed and applied to a number of representative chemicals. The models quantify the amount of chemical deposited in the North Polar Region.
Title: Pharmaceuticals in Drinking Water
Client: Confidential Industrial Client
High population densities can lead to significant recycling of water in the manner: People > wastewater treatment plant > surface water > water treatment plant > people. The conventional concern is infectious diseases, but other constituents, like those related pharmaceuticals (e.g. hormones from birth control pills) can also be communicated in this manner. In this project this recycling was analyzed for a hypothetical pharmaceutical chemical. National databases (USGS HUC, EPA RF1 and NPDES) were used to calculate concentrations in surface waters that serve as drinking water sources. The calculations were done for several rivers representative of average and possible worst-case locations. Mean and low flow (7Q10) hydrologic conditions were analyzed.
Title: Model for the Assessment and Remediation of Sediments (MARS)
Client: Electric Power Research Institute (EPRI)
Production of gas from coal (“town gas”) was common throughout the U.S. up to the 1950s. A byproduct of this process is coal tar and many sites of former Manufactured Gas Plants (MGP) have sediments contaminated with coal tar constituents. This includes metals, arsenic and polyaromatic hydrocarbons (PAHs). In this project a modeling framework designed to simulate the fate and transport of contaminants related to former MGP sites was constructed. The model consists of state-of-the-art hydrodynamic, sediment transport and toxic chemical fate and transport sub-models. The models are integrated using a graphical user interface (GUI), and geographic information system (GIS) technology is used to edit and view spatial model input/results.
Title: Chattahoochee River Water Allocation
Client: MeadWestvaco
The Chattahoochee River is used to dilute wastewater from a coated cardboard manufacturing plant. The effective dilution of the wastewater without adverse impacts on downstream water quality requires a minimum river flow rate, which conflicts with upstream interests (e.g. Atlanta drinking water, Lake Lanier recreation). At the time of the project future water allocation (“water rights”) were negotiated. An existing reservoir simulation model (HEC-5) was used to simulate and evaluate various allocation scenarios. The model includes numerous storage, run-of-the-river and power generating reservoirs, withdrawals and discharges.
Title: Lower Fox River PCB Fate and Transport
Client: US Fish and Wildlife
Past discharges of polychlorinated biphenyls (PCBs) into the Lower Fox River, Wisconsin have contaminated the sediments of the river and downstream Green Bay. This project consisted of evaluating a suite of models developed by other parties. The models consisted of sediment transport and PCB fate and transport models of the Lower Fox River and Green Bay. The models were run under varying scenarios to determine their suitability to forecast the response of the system to several remediation scenarios (e.g. dredging).
Title: Lavaca Bay Mercury Bioaccumulation
Client: Aluminum Company of America (ALCOA)
Past discharges of mercury to Lavaca Bay, Texas have contaminated the sediments and biota. To analyze the bioaccumulation of methylmercury, a food chain model consisting of sediment, benthic invertebrates, shellfish (Blue Crab) and finfish (Red Drum, Black Drum) was constructed. The time variable model accounted for uptake and depuration of methylmercury by each individual species as well as transfer up the food chain (e.g. Blue Crab ŕ Red Drum). Multiple age classes and variable feeding habits with age were included for the higher species. The model was used to simulate methylmercury concentrations in the various species and those were compared to data.
Title: Hudson River PCB Bioaccumulation
Client: General Electric Company
Past discharges of polychlorinated biphenyls (PCBs) into the Upper Hudson River, New York have contaminated sediments and fish. As part of a larger project that aimed to understand the past and future fate and transport of PCBs in the system, a PCB bioaccumulation model for Brown Bullhead was developed. The time-variable model accounted for uptake by ingestion of food and diffusion across the gill, and loss by excretion. Total and homolog specific PCB concentrations were simulated and compared to data.
Title: Corpus Christi Bay Total Constituent Load Estimation
Client: Corpus Christi Bay National Estuary Program
This study was driven by concerns over water quality in Corpus Christi Bay, Texas and adjacent bays and estuaries of the “coastal bend” area (e.g. Baffin Bay, Aransas Bay). Constituent loadings from point and nonpoint sources were estimated. This included total nitrogen, total phosphorus, oil and grease, total lead, total copper and total chromium. The nonpoint source loadings were based on mean annual precipitation, a runoff coefficient and a land-use based event mean concentration (EMC) applied to each 100 m grid box in the watershed. Loadings were routed conservatively, based on a digital elevation model (DEM). The loadings were entered into a water quality model, which was used to estimate constituent concentrations in the bay system.
Papers, Talks, etc.
Papers
Hellweger, F. L., Bucci, V., Litman, M. R., Gu, A. Z., Onnis-Hayden, A. 2009. Biphasic Decay Kinetics of Fecal Bacteria in Surface Water Not a Density Effect. Journal of Environmental Engineering, accepted.
Hellweger, F. L. 2009. Carrying photosynthesis genes increases ecological fitness of cyanophage in silico. Environmental Microbiology, accepted.
Hellweger, F. L., Bucci, V. 2009. A bunch of tiny individuals – Individual-based modeling for microbes (review paper). Ecological Modelling, 220(1):8-22.
[ DOI]
Hellweger, F. L., Kravchuk, E. S., Novotny, V., Gladyshev, M. I. 2008. Agent-based modeling of the complex lifecycle of a cyanobacterium (Anabaena) in a shallow reservoir. Limnol. Oceanogr., 53(4):1227-1241.
[ Paper (PDF) ]
Hellweger, F. L. 2008. The role of inter-generation memory in diel phytoplankton division patterns. Ecological Modelling, 212:382-396.
[ DOI]
Hellweger, F. L., Masopust, P. 2008. Investigating the fate and transport of E. coli in the Charles River, Boston using high-resolution observation and modeling. J. Am. Wat. Res. Assoc., 44(2):509-522.
[ DOI]
Hellweger, F. L. 2008. Ecological Models: Biogeochemical Models. In: Encyclopedia of Ecology, S. E. Jorgensen (Editor), pp. 386-396.
Hellweger, F. L. 2008. Spatially Explicit Individual-Based Modeling Using a Fixed Super-Individual Density. Computers & Geosciences, 34(2):144-152.
[ DOI]
Hellweger, F. L. 2007. Is it time to abandon the chemistry approach to biogeochemistry? (agent-based water quality modeling). Proceedings of WEFTEC.07, p. 5646-5665.
[ Paper (PDF) ]
[ Presentation (PPT) ]
Hellweger, F. L. 2007. Ensemble Modeling of E. Coli in the Charles River, Boston, Massachusetts, USA. Wat. Sci. Technol., 56(6):39-46.
[ Paper (PDF) ]
Hellweger, F. L., Kianirad, E. 2007. Individual-Based Modeling of Phytoplankton: Evaluating Approaches for Applying the Cell Quota Model. J. Theor. Bio. 249:554-565.
[ DOI]
Hellweger, F. L., Kianirad, E. 2007. Accounting for Intra-Population Variability in Biogeochemical Models using Agent-Based Methods. Environ. Sci. Technol. 41(8):2855-2860.
[ Electronic Reprints]
[ DOI]
D'Artista, B., Hellweger, F. L. 2007. Urban Hydrology in a Computer Game? Environmental Modeling & Software, 22(11):1679-1684.
[ Link ]
Hellweger, F. L., Miller, W., Oshodi, K. S. 2007 Mapping Turbidity in the Charles River, Boston Using a High-resolution Satellite. Environ. Monitor. Assess., 132(1-3):311-320.
[ Paper (PDF) ]
Blumberg, A. F., and F. L. Hellweger, 2006. Hydrodynamics of the Hudson River Estuary. In: Hudson River Fishes and their Environment, Waldman, J., K. Limburg, and D. Strayer, Eds. American Fisheries Society Symposium 51:9-28.
[ PDF ]
Ghosh, I., Hellweger, F. L., Fritch, T. G. 2006. Fractal Generation of Artificial Sewer Networks for Hydrologic Simulations. Proc. of 2006 ESRI International User Conference.
[ Paper (PDF) ]
[ Presentation (PPT) ]
Hellweger, F. L. 2006. Where the Pipe Ends: The Fate of Discharges. Utility Executive, 9(1):144-15.
[ Paper (PDF) ]
Li, H.; Blumberg, A. F.; Hellweger, F. L.; Ahsan, Q. 2005. Understanding the Hydrodynamics of a Multidam River System. In: Proceedings of the American Water Resources Association 2005 Annual Conference, Steward, C., Ed., Middleburg Virginia.
[ Paper (PDF) ]
[ Abstract ]
McGrath, J., Parkerton, T., Hellweger, F. L., Di Toro, D. M. 2005. Validation of the narcosis target lipid model for petroleum products: gasoline as a case study. Environ. Toxicol. Chem., 24(9):2382-2394.
[ Paper (PDF) ]
Hellweger, F. L., 2005. Measuring and Modeling Large-Scale Pollutant Dispersion in Surface Waters. In: Collection Systems 2005, pp. 812-835, Water Environment Federation (WEF), Alexandria, Virginia.
[ Paper (PDF) ]
[ Appendix (DOC) ]
[ Model (XLS) (6 MB) ]
Hellweger, F. L., 2005. Dynamics of As Speciation in Surface Water: As(III) Production by Algae. Appl. Organometalic Chem., 19:727-735.
[ Paper (PDF) ]
Di Toro, D. M., Hellweger, F. L., Thuman, A. J., 2004. Assessment of PCB Contamination in the Delaware River Estuary - Decadal Scale Consistency Check. Proceedings of WEFTEC 04, Water Environment Federation (WEF). New Orleans, Louisiana.
[ PDF ]
Hellweger, F. L., P. Schlosser, U. Lall, and J. K. Weissel, 2004. Use of Satellite Imagery for Water Quality Studies in New York Harbor. Estuarine Coastal Shelf Sci., 61(3), 437-448.
[ ScienceDirect Link  ]
(#2 on ECSS Most Requested list: [ Elsevier Link ]
[ Archive PDF ])
Hellweger, F. L., A. F. Blumberg, P. Schlosser, D. T. Ho, T. Caplow, U. Lall, and H. Li, 2004. Transport in the Hudson Estuary: A modeling study of estuarine circulation and tidal trapping. Estuaries, 27(3), 527-538.
[ PDF ]
[ PDF (Model Skill Assessment Metrics) ]
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2003. Greedy Algae Reduce Arsenate. Limnol. Oceanogr., 48, 2275-2288.
[ PDF
]
Hellweger, F. L. and A. L. Gordon, 2002. Tracing Amazon River Water into the Caribbean Sea. J. Mar. Res., 60(4), 537-549.
[ Abstract ]
[ PDF ]
Hellweger, F. L., L. Hay Wilson, E. M. Naranjo, and P. J. Anid, 2002. Adding Human Health Risk Analysis Tools to Geographic Information Systems. Transactions in GIS. 6(4), 471-484.
[ Abstract ]
[ PDF ]
McGrath, J. A., F. L. Hellweger and D. M. Di Toro, 2001. Equilibrium Partitioning Sediment Guidelines (ESGs) for PAH Mixtures and their Application to MGP Sites. In: Sediments Guidance Compendium. A. Coleman, Ed. Electric Power Research Institute (EPRI), Palo Alto, California.
Hellweger, F. L., K. J. Farley, D. Damiani, and P. J. Anid, 2001. Mathematical Modeling of Toxics Fate, Transport and Bioaccumulation using GIS . Proceedings of the 21st Annual ESRI International User Conference, Environmental Systems Research Institute, Redlands, California.
Hellweger, F. L., E. Naranjo, G. M. Ostroff, R. Veneros and P. J. Anid, 2000. SWMOD: A Simple GIS Based Toxics Modeling Framework. Proceedings of the Watershed 2000 Specialty Conference, Water Environment Federation, Alexandria, Virginia.
[ PDF ]
Naranjo, E., F. L. Hellweger, L. Wilson and P. J. Anid, 2000. Mapping Risk from Mining Activities: A Case Study of Oruro, Bolivia. Proceedings of the 20th Annual ESRI International User Conference, Environmental Systems Research Institute, Redlands, California.
Hellweger, F. L., and D. R. Maidment, 1999. Definition and Connection of Hydrologic Elements Using Geographic Data. J. Hydrol. Engrg., 4(1), 10-18.
[ Abstract ]
[ PDF ]
Hellweger, F. L., E. Naranjo, P. Shanahan, K. Fellows, G. M. Ostroff and P. J. Anid, 1999. Screening-Level GIS Tools for Modeling Environmental Contamination from Mining Activities. Proceedings of the 19th Annual ESRI International User Conference, Environmental Systems Research Institute, Redlands, California.
[ HTML
]
Cochrane, J. J., A. Banoub, and F. L. Hellweger, 1996. Growing LIMS. Operations Forum, 13(2), 22-25.
Cochrane, J. J., and F. L. Hellweger, 1995. A Method amid the Madness - Introducing a straightforward procedure for process control. Operations Forum, 12(2), 14-17.
Cochrane, J. J., and F. L. Hellweger, 1994. Identifying the key factors for predicting and maintaining treatment plant performance. J. New England Wat. Environ. Assoc., 28(1), 79-90.
Presentations
Hellweger, F. L., Kianirad, E., 2006. Spatially Explicit Individual-Based Modeling:
Global vs. Local Fixed Agent Number Methods. SwarmFest 2006 - Agent-Based Simulation Meeting. Notre Dame University, South Bend, Indiana.
[ PPT (8MB) ]
[ Conference page ]
Hellweger, F. L., 2006. Use of the Internet for Environmental Education – Going Beyond Transferring Files. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ PPT (15MB) ]
[ WEBDOSAG ]
[ UTFLOW ]
[ LION1 ]
Jain, A., Skorobogatov, Y., Gallucci, M., Lingle, J., Blazicek, T., Hellweger, F. 2005. Development of Concept Designs for Remediation Contaminated Sediment Sites using Model for Assessment and Remediation of Sediments (MARS): Current Status and Future Plans. Natural Gas Technologies 2005, Gas Technology Institute (GTI), Orlando, Florida.
[ Program link ]
Hellweger, F. L., A. F. Blumberg, P. Schlosser, D. T. Ho, T. Caplow, U. Lall, and H. Li, 2005. Modeling and Measuring Mixing of Pollutants in Surface Waters. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ Abstract ]
[ PPT (9MB) ]
Hellweger, F. L., 2005. Use of Interactive Web Pages in Environmental Engineering Education. Research and Education Conference, Association of Environmental Engineering and Science Professors (AEESP), Clarkson University, Pottsdam, New York.
[ Abstract ]
[ PPT (15MB) ]
[ WEBDOSAG ]
[ UTFLOW ]
[ LION1 ]
Hellweger, F., 2004. Modeling Phosphorus Luxury Uptake in Lake Biwa, Japan. Summer Meeting. American Society of Limnology and Oceanography (ASLO). Savannah, Georgia.
[ PPT (2.9MB)]
Jain, A., F. Hellweger, Y. Skorobogatov, M. Gallucci, J. Lingle, and T. Blazicek, 2004. Model for the Assessment and Remediation of Sediments (MARS): Recent Modifications with Applications to Tidal Rivers and Future Plans. Natural Gas Technologies II Conference and Exhibition.
Gas Technology Institute (GTI). Phoenix, Arizona.
[ PDF (conference brochure)
]
Farley, K. J., K. J. Rader, R. Costanzo, J. Nemesh, F. L. Hellweger and D. M. DiToro, 2003. Development of a "Unit World" Model for Metals in Aquatic Environments. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Austin, Texas.
McGrath, J. A., F. L. Hellweger, T. F. Parkerton, and D. M. Di Toro, 2003. Application of the Narcosis Target Lipid Model to Complex Mixtures Using Gasolines as a Case Study. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Austin, Texas.
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2003. Arsenic transformation by algae: The role of phosphorus luxury uptake. 226th National Meeting, American Chemical Society (ACS), New York City, New York.
[ Abstract]
[PPT]
Jain, A., M. Gallucci, Y. Skorobogatov, J. Lingle, and F. L. Hellweger, 2003. Model for the Assessment and Remediation of Sediments (MARS): Recent Modifications with Applications to Tidal Rivers and Future Plans. A Workshop on In-situ Contaminated Sediment Capping.
Hosted by EPRI, USEPA, USACE, NOAA and US Navy. University of Cincinnati, Ohio.
Blumberg, A. F., and F. L. Hellweger, 2003. Circulation and Mixing in the Hudson River Estuary. Hudson River Fishes & Their Environment. Hudson River Environmental Society (HRES). Poughkeepsie, New York.
[ PDF (Flyer)
]
[ Abstract ]
[ PPT ]
Farley, K. J., D. M. Di Toro, J. D. Mahony, F. L. Hellweger, P. Dombrowski, K. Bisceglia, and K. Rader, 2002. Modeling Arsenic Cycling in Lakes and Reservoirs. Environmental Science: Water, Gordon Research Conference, Holderness, New Hampshire.
Hellweger, F. L., A. F. Blumberg, P. Schlosser, D. T. Ho, T. Caplow, U. Lall and H. Li, 2002. Mixing in the Hudson Estuary – The role of estuarine circulation and tidal trapping. Fall Meeting, American Geophysical Union (AGU), San Francisco, California.
[Abstract published in Eos. Trans. AGU, 83(47), Fall Meet. Suppl., Abstract OS21D-10, 2002.
PDF
]
[ Abstract ]
[ PPT ]
[ EXE (Animation. It's clean) ]
[ Outstanding Student Paper Award (OSPA) ]
Di Toro, D. M., J. A. McGrath, and F. L. Hellweger, 2001. The Intrinsic Toxicity of Narcotic Chemicals and PAHs in Pure Phases and Mixtures. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Baltimore, Maryland.
McGrath, J. A., F. L. Hellweger, W. Stubblefield, and D. M. Di Toro, 2001. Predicting the Effects of Weathering on Crude Oil Using Narcosis Theory: Case Studies. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Baltimore, Maryland.
Hellweger, F. L., K. J. Farley, D. Damiani, and P. J. Anid, 2001. Mathematical Modeling of Toxics Fate, Transport and Bioacccumulation Using GIS. 33rd Mid-Atlantic Industrial and Hazardous Waste Conference, New York City, New York.
[ Abstract ]
Hellweger, F. L., and G. M. Ostroff, 2001. www.ComCarto.com - An Internet Map Server. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ Abstract ]
Hellweger, F. L., and D. M. Di Toro, 2001. Modeling the Distribution and Fate of PBTs in the Environment. Workshop on Persistent, Bioaccumulative and Toxic Chemicals: Assessing the State of the Science, Water Environment Federation (WEF), Arlington, Virginia.
Hellweger, F. L., K. J. Farley, D. Damiani, and P. J. Anid, 2001. Toxic Fate and Bioaccumulation Modeling Inside GIS. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Nashville, Tennessee.
[ Abstract ]
Shrestha, P. L., A. F. Blumberg, D. M. Di Toro, and F. L. Hellweger, 2000. A Three-Dimensional Model for Cohesive Sediment Dynamics in Shallow Bays. Joint Conference on Water Resources Engineering and Water Resources Planning & Management, American Society of Civil Engineers (ASCE), Minneapolis, Minnesota.
[Abstract published in Water Resources 2000, R. H. Hotchkiss, M. Glade, Eds., ASCE.
HTML
]
[ Abstract ]
Hellweger, F. L., 2000. Mathematical Modeling of Mining Pollution Using GIS. 32nd Annual Mid-Atlantic Industrial and Hazardous Waste Conference, Troy, New York.
Di Toro, D. M., J. A. McGrath, and F. L. Hellweger, 2000. Review and Comparison of Existing and Developing Standards/Criteria/Screening Guidelines. MGP Site Management Sediment Seminar II, Electric Power Research Institute (EPRI), St. Simon's Island, Georgia.
Hellweger, F. L., 2000. Water Quality and GIS: An Overview of Current Technology. Annual Conference. New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ Abstract ]
[ PPT ]
Garland, E. J., F. L. Hellweger, M. J. Carroll, D. M. Di Toro, A. Jain and O. K. Scheible, 1999. MARS: Model for the Assessment and Remediation of Sediments. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Philadelphia, Pennsylvania.
Jain, A., F. Hellweger, K. Summers, and S. Liu, 1998. Development of Remediation Scenarios Using Models, Environmental Biotechnologies and Site Remediation Technologies Conference, Gas Technology Institute (GTI), Orlando, Florida.
Hellweger, F. L., and D. R. Maidment, 1998. BALANCE: A GIS Based Water Quality Model. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ Abstract ]
Hellweger, F. L., and D. R. Maidment, 1997. BALANCE: A GIS Based Water Quality Model. ArcView GIS Application Development Competition (first place), Annual Conference, Environmental Systems Research Institute (ESRI), Redlands, California.
Maidment, D. R., F. L. Hellweger, and A. Quenzer, 1997. Integrating Land Surface Runoff and Receiving Water Impacts in Corpus Christi Bay. Spring Meeting, American Geophysical Union (AGU), Baltimore, Maryland.
[ INVITED Presentation ]
Hellweger, F. L., 1997. Environmental Data and Education on the Internet: An Overview of Current Technology. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Cochrane, J. J., A. Banoub, and F. L. Hellweger, 1996. Implementation of a customized laboratory information management system (LIMS). Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Hellweger, F. L., and J. J. Cochrane, 1996. Using Technical Calculation Software as a Process Design and Evaluation Tool. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Cochrane, J. J., A. Banoub, and F. L. Hellweger, 1995. An affordable customized laboratory information management system (LIMS) for a medium sized plant. Annual Conference, Water Environment Federation (WEF), Miamu Beach, Florida.
Cochrane, J. J., and F. L. Hellweger, 1995. An analysis of the advantages of combined CAD mapping & GIS with computerized collection system maintenance. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Cochrane, J. J., and F. L. Hellweger, 1994. Interpreting Treatment Plant Performance Using an Attainment Frequency Methodology. Annual Conference, Water Environment Federation (WEF), Chicago, Illinois.
Cochrane, J. J., and F. L. Hellweger, 1994. Integrating GIS mapping with computerized collection system maintenance. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Cochrane, J. J., and F. L. Hellweger, 1994. Identifying the key factors for predicting and maintaining treatment plant performance. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Posters
Hellweger, F. L., Kravchuk, E. S., Novotny, V., Gladyshev, M. I. 2007. Agent-based modeling of the complex lifecycle of a cyanobacterium (Anabaena) in a shallow lake. AEESP Conference, Virginia Tech, Blacksburg, VA.
[ PDF ]
Hellweger, F. L., Kianirad, E., 2006. Individial-Based Modeling of Phytoplankton. Environmental Sciences - Water, Gordon Research Conference, Plymouth, New Hampshire.
[ PDF ]
Hellweger, F. L., Ghosh, I., 2006. Simulating Urban Hydrology Using Artificial Sewer Networks. Geological Society of America (GSA), Annual Meeting, Philadelphia, Pennsylvania.Geological Society of America Abstracts with Programs 38(7):290.
[ Abstract@GSA ]
[ Poster PDF ]
[ Errata PDF ]
[ WE&T News Link ]
[ News Archive PDF ]
Hellweger, F. L., Kianirad, E., 2006. From Individuals to Populations in Biogeochemical Modeling. Grand Challenges of the Future for Environmental Modeling. NSF Sponsored Workshop on Modeling for Environmental Observatories, Tucson, Arizona.
[ PDF ]
[ Workshop Homepage ]
Masopust, P., and Hellweger, F. L., 2006. High resolution spatial and temporal patterns of Escherichia Coli in the Charles River. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
[ PDF (0.3MB) ]
Miller, W., and F. L. Hellweger, 2005. Remote Sensing of Turbidity in the Lower Charles River. 3rd Annual Conference of the Massachusetts Water Resources Research Center, University of Massachusetts, Amherst, MA.
[ scaled down PDF (0.2 MB) ]
[ full size JPG (1.0 MB)]
Ho, D., P. Schlosser, F. Hellweger, T. Caplow, 2003. Factors Controlling Net Advection and Longitudinal Dispersion in the Tidal Hudson River: Results from SF6 Tracer Experiments. Fall Meeting, AGU, San Francisco, California.
[Abstract published in Eos. Trans. AGU, 84(46), Fall Meet. Suppl., Abstract H41D-1041, 2003.
HTML
]
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2003. Arsenic transformation by algae: The role of phosphorus luxury uptake. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Austin, Texas.
[ Abstract ]
[ PDF (4.2 MB)]
Hellweger, F. L., M. J. Gallucci, A. Jain, D. K. Jackson, and B. Cheney, 2003. Model Helps Screen Remediation Alternatives at MGP Site. A Workshop on In-situ Contaminated Sediment Capping.
Hosted by EPRI, USEPA, USACE, NOAA and US Navy. University of Cincinnati, Ohio.
[ Abstract ]
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2002. Greedy Algae Reduce Arsenate. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Salt Lake City, Utah.
[ Abstract ]
[ PDF ]
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2002. A Model for Arsenic Transformation by Algae. Environmental Bioinorganic Chemistry, Gordon Research Conference, Andover, New Hampshire.
[ Abstract ]
Hellweger, F. L., J. A. McGrath, W. Stubblefield, and D. M. Di Toro, 2001. Dissolution, Weathering and Toxicity of Exxon Valdez Crude Oil. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Baltimore, Maryland.
[ Abstract ]
Jain, A., and F. L. Hellweger, 2001. MARS: Model for the Assessment and Remediation of Sediments. Forum on Managing Contaminated Sediments at Hazardous Waste Sites, US Environmental Protection Agency (USEPA), Alexandria, Virginia.
Hellweger, F. L., K. J. Farley, U. Lall, and D. M. Di Toro, 2001. Arsenic Fate and Transport Modeling in Lakes: Approach and Preliminary Results. Arsenic in Drinking Water, An International Conference at Columbia University, New York City, New York.
[ Abstract ]
Hellweger, F. L., E. M. Naranjo, G. M. Ostroff, and P. J. Anid, 2000. A Shared Environmental Geographic Information System to Build an Inter-Agency Relationship. Joint Conference on Water Resources Engineering and Water Resources Planning & Management, American Society of Civil Engineers (ASCE), Minneapolis, Minnesota.
[ Abstract ]
Shrestha, P. L., A. F. Blumberg, D. M. Di Toro, J. J. Fitzpatrick, F. L. Hellweger and L.A. Khan, 1999. Sediment-Transport Modeling in Green Bay: A Precursor to Addressing PCB Fate and Transport, Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Philadelphia, Pennsylvania.
Hellweger, F. L. and D. M. Di Toro, 1999. Orthogonal Distance Regression: An Alternative to Ordinary Least Squares, Poster Presentation. Annual Meeting, Society of Environmental Toxicology and Chemistry (SETAC), Philadelphia, Pennsylvania.
Workshops
Hellweger, F. L. 2005. Hurricane Katrina - Environmental Impacts - A Workshop. Northeastern University, Boston, Massachusetts.
[ Workshop homepage ]
Licenses
Professional Engineer (PE), New York (#082650).
Engineer in Training (EIT), Massachusetts (#6539).
Awards
2002. Outstanding Student Presentation Award (OSPA). American Geophysical Union (AGU) Fall Meeting, San Francisco, California.
1997. First Place Programming Competition. Environmental Systems Research Institute (ESRI) User Conference, San Diego, California.
1995. Sears B. Condit Award. Northeastern University, Boston, Massachusetts.
[ GIF ]
Service
Session Chairing and Moderating
Hellweger, F. L., 2006. Saturday Morning Session. SwarmFest 2006 - Agent-Based Simulation Meeting. Notre Dame University, South Bend, Indiana.
[ Conference page ]
Hellweger, F. L., 2006. Session 17 - Controlling CSOs. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Cochrane, J. J. and F. L. Hellweger, 2005. Session 20 - Internet & Computers. Annual Conference, New England Water Environment Association (NEWEA), Boston, Massachusetts.
Hellweger, F., 2004. CS38 Modeling Approaches. Summer Meeting. American Society of Limnology and Oceanography (ASLO). Savannah, Georgia.
[ Program Link HTML ]
Paper Reviewing
Estuarine and Coastal Shelf Science
Water Res. Bull./J. Am. Wat. Res. Assoc. (JAWRA)
Water Resources Management (WARM)
Membership
Last Updated: 1/17/2009.
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