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| EDUCATION |
Ph.D., Environmental Science – 2016
Emphasis in environmental hydrology, hydraulics, and biogeochemistry Iowa State University, Ames, Iowa.
B.S., Environmental Science with a dual major in Chemistry – 2003
Emphasis in hydrology, hydrography, and environmental chemistry University of New Mexico, Albuquerque, New Mexico.
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| PROFESSIONAL EXPERIENCE |
Research Scientist III, Iowa State University, Ames, Iowa
Research into wetland and surface water hydrodynamics and water quality, and watershed rainfall-runoff processes. Des Moines River water quality monitoring. Geographic information systems development and programming. Grant development and administration. Mentoring of graduate students.
Adjunct Assistant Professor, EEOB, Iowa State University, Ames, Iowa Undergraduate and graduate instruction and course development. Serve as a voting member on several PhD and MS program of study committees.
Doctoral Candidate/Pre/Post-doctoral Research Associate, Iowa State University, Ames, Iowa Research into wetland and surface water hydrodynamics and water quality, and watershed rainfall- runoff processes. Des Moines River water quality monitoring. Geographic information systems development and programming. Grant development and administration. Mentoring of graduate students. Taught and co-taught various courses in the Environmental Science undergraduate program. Iowa State University Environmental Science Graduate Research Fellow.
Water Resources Specialist/Hydrologist, New Mexico Interstate Stream Commission, Albuquerque, New Mexico Assisted with the development and analysis of large basin-scale surface water supply and groundwater models. Developed a comprehensive water quality and hydrologic database of the Lower Rio Grande Valley (New Mexico and Texas).
Water Quality Technician, Parsons Engineering, Albuquerque, New Mexico Developed water quality sampling protocols. Collected water quality and material samples for a basin-scale fecal coliform loading study.
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| PUBLICATIONS | REPORTS |
Green, D., and Crumpton, W. 2025. Numerical simulation of the residence time distribution dynamics of a restored agricultural wetland under varying environmental conditions. Water Science & Technology, 91(7), pp.827-849.
Mitchell, Mark E., Anteau, M.J, Pearse A.T. Newcomer-Johnson, T. Christensen, J. Crumpton, W., Dyson, B., Canfield, T.J., Helmers, M., Green, D., Forshay, K.J. 2025. Modeling wetland resources for spring migratory waterbirds under different agricultural management scenarios in the Iowa portion of the Prairie Pothole Region, USA. Wetlands (In-press)
Green, D., Crumpton, W., Stenback, G. 2024. Nutrient modeling for wetlands in Iowa. Report to USEPA Region 7 and USGS National Water Center. Cooperative Agreement G21AC10559
Green, D.I.S., Crumpton, W.G., 2023. Depressional runoff cascade networks of the Des Moines Lobe of Iowa. JAWRA Journal of the American Water Resources Association. 00(0):1-31. https://doi.org/10.1111/1752-1688.13103
Hall, S. J., Tenesaca, C. G., Lawrence, N. C., Green, D. I. S., Helmers, M. J., Crumpton, W. G., Heaton, E. A., & VanLoocke, A., 2023. Poorly drained depressions can be hotspots of nutrient leaching from agricultural soils. 00, 00– 00. https://doi.org/10.1002/jeq2.20461
Zhang, J., Lu, C., Crumpton, W., Jones, C., Tian, H., Villarini, G., Schilling, K., Green, D., 2022. Heavy precipitation impacts on nitrogen loading to the Gulf of Mexico in the 21st century: Model projections under future climate scenarios. Earth's Future, 10, e2021EF002141. https://doi.org/10.1029/2021EF002141
Mitchell, M.E., Newcomer-Johnson, T., Christensen, J., Crumpton, W., Richmond, S., Dyson, B., Canfield, T.J., Helmers, M., Lemke, D., Lechtenberg, M. and Green, D., Forshay, K., 2022. Potential of water quality wetlands to mitigate habitat losses from agricultural drainage modernization. Science of The Total Environment, 838, p.156358
Crumpton, W.G., Stenback, G.A., Fisher, S.W., Stenback, J.Z., Green, D.I.S. 2020. Water Quality Performance of Wetlands receiving nonpoint-source nitrogen loads: Nitrate and total nitrogen removal efficiency and controlling factors. Journal of Environmental Quality 1-10. https://doi.org/10.1002/jeq2.20061
Green, D.I.S., McDeid, S.M., Crumpton, W. G. 2019. Runoff Storage Potential of Drained Depressions on the Des Moines Lobe of Iowa. Journal of the American Water Resources Association 55(3):543-558. https://doi.org/10.1111/1752-1688.12738
Green, D.I.S., Crumpton, W.G., van der Valk, A., Helmers, M., Gelder, B.K., McDeid, S.M. 2018. Characterization of Wetland Depressions in Iowa and Their Potential Influence on Downstream Waters. Report to the United States Environmental Protection Agency, Wetlands Development Program Grant #97754001
McDeid, S.M., Green, D.I.S., Crumpton, W.G. 2018. Morphology of Drained Upland Depressions on the Des Moines Lobe of Iowa. Wetlands. https://doi.org/10.1007/s13157-018-1108-4
Green, D.I.S. 2017. Assessment of the Effects of O’Shaughnessy Dam Removal on the Temperature Dynamics of the Upper Tuolumne River and Don Pedro Reservoir. Report to Restore Hetch Hetchy, Oakland, California.
Green, D.I. 2016. Environmental Factors Affecting the Residence Time Distribution Dynamics of Agricultural Wetlands. Ph.D. Dissertation. Iowa State University. Ames, Iowa.
Otis, D. L., Crumpton, W. G., Green, D.I., Loan-Wilsey, A., Cooper, T. and Johnson, R. R. 2013. Predicted Effect of Landscape Position on Wildlife Habitat Value of Conservation Reserve Enhancement Program Wetlands in a Tile-drained Agricultural Region. Restoration Ecology. https://doi.org/10.1111/j.1526-100X.2012.00898.x
Crumpton, W.G., Green, D.I., Loan-Wilsey, A., McNeely, R., Kane, K., Otis, D., Cooper, T., and Johnson, R. 2010. Assessment of Environmental Services of CREP Wetlands in Iowa and the Mid-western Corn Belt. Iowa Cooperative Fish and Wildlife Research Unit Reports. 3. http://lib.dr.iastate.edu/cfwru_reports/3
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| SPECIALIZED TRAINING IN WATER RESOURCES MODELING |
Environmental Fluid Dynamics Code/EFDC_Explorer (DSI, Knoxville, TN) – Certified 2012
RiverWare II: Advanced River Basin and Reservoir Routing
(CADSWES, Colorado University, Boulder, CO) - Certified 2006
RiverWare I: Intro. River Basin and Reservoir Routing
(CADSWES, Colorado University, Boulder, CO) - Certified 2005
MikeZero and Mike21 (Danish Hydraulic Institute, DK)
WMS and GSSHA (Aquaveo, Provo, UT)
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| TECHNICAL SKILLS |
• ArcGIS with Emphasis on Automation (using ArcPy) and Water Resources
• Python, R, VBA (Excel and MS Access), and Matlab Scientific Scripting and Programming
• Excel and Access Development and Programming Advanced Scientific Computing and Numerical Modeling
• Advanced Multivariate, Spatial, and Temporal Statistical Modeling
• Grant Development and Technical Writing
• Flourometry and Dye Dispersion Studies in Surface Water Systems
• Advanced Contaminant Transport Numerical Model Development, Fitting, and Analysis
• Surface Water and Groundwater Hydrology, Hydrodynamics, and Dispersion Processes
• Extensive Knowledge of Environmental Biogeochemical Processes
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| RELEVANT ACADEMIC TRAINING |
Physical Hydrology|Watershed Hydrology
Intermediate Engineering Hydrology
Open Channel Hydraulics
Environmental Flows and Fluid Mechanics
Hydrogeology|Groundwater Modeling
Groundwater Contaminant Transport Processes
Soil Physics|Advanced Soil Physics
Environmental Biogeochemistry
Wetland Ecology
Aquatic Ecology
Environmental Engineering Chemistry
Quant., Organic, Phys., Bio. Chem. Sequences
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Applied Water Quality Modeling
Ecosystems Ecology
Environmental Systems I & II
Classical Physics I & II
Calculus Sequence for Mathematics Majors
Differential Equations and Laplace Transforms
Numerical Methods and Scientific Computing
Numerical Methods for ODEs and PDEs
Time-series Analysis|Spatial Statistics
Statistics for Researchers|Experimental Design
GIS for Water Resources|Advanced GIS
Programming for GIS Applications
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| RESEARCH GRANT AWARDS |
Morphology of Drained Upland Depressions on the Des Moines Lobe of Iowa and their Hydrologic Connectivity. PIs: Green, D.I., Crumpton, W.G., van der Valk, A., Helmers, M. Gelder, B.K., EPA Wetlands Development Grant. Award Number 97754001. October, 2015 – October, 2018. $178,000
Edge-of-Field (EOF) Practice Location, Performance and Feasibility Analysis: Strategically Located Wetlands. PIs: Crumpton, W.G., Helmers, M., Green, D.I.S, Iowa Department of Agriculture and Land Stewardship. Award Number 17WQI-EOF-2. December 31, 2017 – December 31, 2018. $350,000
Assessing Patterns in Nutrient Transport and Loads. PIs: Crumpton, W.G., Stenback, G., Green, D.I.S, Iowa Nutrient Research and Education Council. December 1, 2017 – December 31, 2018. $148,000
Impacts of Drained Depressions on Runoff and Nutrient Exports in Tile-Drained Agricultural Watersheds. PIs: Green, D.I.S, Crumpton, W.G., Stenback, G.A., EPA Wetlands Program Development Grant. Award Number 97770701. October, 2019 – October, 2021. $158,000
Linking Agricultural Practices to Water Quality Improvement: The Importance of Scale in Accurately Characterizing Nonpoint Source Nutrient Loads in Iowa Streams. PIs: Green, D.I.S., Crumpton, W.G., Chaoqun, L, Isenhart, T., Rehmann, C., Wilkinson, G., Iowa Nutrient Research Center. Award Number 2019-15. July, 2019 – June, 2021. $148,000
Quantifying and mitigating indirect greenhouse gas emissions from tile-drained agricultural catchments. PIs: Green, D.I.S., Hall, Steven, Crumpton W.G., and Chaoqun, L. National Institute for Food and Agriculture. 2023 – Ongoing. $670,000
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| CONFERENCES posters (*) and presentations (†) |
†2019 American Water Resources Annual Conference Salt Lake City, Utah:
Runoff Storage Potential of Drained Wetland Depressions in the Des Moines Lobe of Iowa
†2018 Geological Society of America North-central Chapter Meeting Ames, Iowa:
Three Dimensional Simulation of the Temperature and Residence Time Distribution Dynamics of a Constructed Agricultural Wetland
†2018 EPA Region 7 Wetlands Development Grant Symposium EPA Region 7 Offices, Olathe Kansas:Morphological Characterization of Isolated Wetland Depressions in the Des Moines Lobe of Iowa
†2017 American Water Resources Association Spring Specialty Conference Snow Bird, Utah:
Morphological Characterization of Isolated Wetland Depressions in the Des Moines Lobe of Iowa
†2016 Dissertation Research Presentation, Iowa State University Ames, Iowa:
Environmental Factors Affecting the Residence Time Distribution Dynamics of Constructed Agricultural Wetlands
*2013 – 2015 Annual Environmental Science Graduate Program Research Symposium Iowa State University, Ames: IowaResidence Time Distributions in Agricultural Wetlands
*2006 Lower Rio Grande Salinity Conference:
Lithology of Deep Piezometers in the Mesilla Valley, NM 2006 Lower Rio Grande Salinity Conference
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| TEACHING |
Environmental Science 110. Introduction to Environmental Science. Iowa State University, Ames, Iowa. Fall semester, 2010, 2011, and 2012. Instructor of record. Course development and teaching.
Environmental Science 370X. Introduction to Geographic Information Systems for Environmental Sciences. Fall and spring semesters, 2010, 2011, 2012, and 2013. Instructor of record. Course development and teaching.
Environmental Science 381. Environmental Systems Analysis I. Iowa State University, Ames, Iowa. Fall semester: 2014, 2015, and 2022. Instructor of record. Course development, teaching, supervision of teaching assistants.
Environmental Science 382. Environmental Systems Analysis II. Iowa State University, Ames, Iowa. Spring semester: 2015, 2016, and 2023. Instructor of record. Course development, teaching, supervision of teaching assistants.
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| ADVISING and MENTORING |
Academic advisor, environmental science undergraduate program, Iowa State University, academic years 2010 through 2012. Advised 50 environmental science undergraduate students.
Coordinator, environmental science freshman learning community, Iowa State University academic years 2010 through 2012. Average enrollment of 40 students.
Mentor to three graduate students at Iowa State University: Samuel McDeid, MS, 2017; Jacob Eeling, MS, 2019; and Calvin Wong, MS, 2021.
Committee member for: Jonathan Norton, Iowa State University Environmental Science Graduate Program (PhD); Abdullahi Adeola, Iowa State University Environmental Science Graduate Program (PhD); Julie Lennon, Iowa State University Environmental Science Graduate Program (MS).
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›AGRICULTURAL WETLAND RESEARCH SITES IN IOWA