Environmental Engineering and Water Resources Research...Environmental Engineering and Water Resources Research. Dr. Sajjad Ahmad, P.E. Chair & Professor, Department of Civil and Environmental

Environmental Engineering and Water Resources

Research

March 2019 1

Environmental Engineering and Water Resources Research

Dr. Rama VenkatDean, College of EngineeringPhone: (702) 895-1094Email: [email protected]

Dr. Mohamed TrabiaAssociate Dean, College of EngineeringPhone: (702) 895-0957Email: [email protected]

Currently at UNLV, researchers are actively pursuing research in environmental engineering, water quality, and water resources. This research, which is funded by multiple agencies and industries, specifically address very important questions to the state, the southwest, and the world.

We would like to introduce you to some of our researchers. Please feel to contact us if we can help with future collaboration.

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• Geographic information systems (GIS)

• Remote sensing

• Data visualization

• Hydrologic and hydraulic modeling

• Urban thermodynamic and hydrodynamic modeling

• Hydro climatology

• Sustainable water resources management

• Water-energy nexus

• Vulnerability assessment to floods and droughts

• Estimation of streamflow and precipitation

• Estimation of water depth, soil moisture, and flooding using satellites

Environmental Engineering and Water ResourcesResearch Areas of Expertise

• Modeling and assessment of surface water quality

• Trace organic contaminants

• Environmental microbiology

• Adsorption processes and ion-exchange technology

• Bio-regeneration of ion exchange

• Water quality control

• Removal of organic and inorganic contaminants from water

• Paved road dust emissions

• Solar distillation

• Disinfection byproducts

• Stormwater pollution control

• Lab-on-a-chip technologies towards water and wastewater treatment

• Advanced oxidation with ozone

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Why UNLV?

• UNLV is situated in the center of a metropolitan area faced with serious challenges related to the quality of air and water.

• UNLV’s researchers have contributed steadily to meet these challenges.

• UNLV’s researchers have established strong collaborations with federal and local agencies in addition to developing strong partnerships with industries.


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Dr. Sajjad Ahmad, P.E.Chair & Professor, Department of Civil and Environmental Engineering and Construction

Dr. Jacimaria Batista, P.E.Professor, Department of Civil and Environmental Engineering and Construction

Dr. Daniel GerrityAssociate Professor, Department of Civil and Environmental Engineering and Construction

Dr. Dave James, P.E., F. NSPEAssociate Professor, Department of Civil and Environmental Engineering and ConstructionDirector, Solar and Renewable Energy Programs

Dr. Eakalak KhanProfessor, Department of Civil and Environmental Engineering and Construction

Dr. Erica MartiAssistant Professor, Department of Civil and Environmental Engineering and Construction

Dr. Emma RegentovaProfessor, Department of Electrical and Computer Engineering

Dr. Haroon StephenAssociate Professor, Department of Civil & Environmental EngineeringDirector, GIS and Remote Sensing Core Lab and Visualization Facility

Faculty Involved in Environmental Engineering and Water Resources Research

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Additional Resources

GIS and Remote Sensing Core Laboratory

Losing the Lake: An educational computer simulation game to increase awareness about climate change and

water management in the Colorado River Basin

http://gis.unlv.edu/

http://www.cse.unr.edu/%7Ehpcvis2/Projects/LosingTheLake/LosingTheLake_V2.swf

http://www.cse.unr.edu/%7Ehpcvis2/Projects/LosingTheLake/LosingTheLake_V2.swf

Environmental Engineering and Water Resources

Research Highlights

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Phone: (702) 895-5456

Email: [email protected]

Website: http://faculty.unlv.edu/sajjad/

• Expertise• Water management in response to climate

variability and change• Seasonal-to-interannual estimation of streamflow

and precipitation• Hydrologic and hydraulic modeling• Estimation of water depth, soil moisture, and

flooding using Satellite Remote Sensing• Sustainable water resources management• Water-energy nexus• Vulnerability assessment to floods and droughts• Public health

Dr. Sajjad Ahmad, P.E.Chair and Professor, Department of Civil and Environmental Engineering and Construction

March 2019 8


Dr. Sajjad Ahmad, P.E.Chair & Professor, Department of Civil and Environmental Engineering and ConstructionRecent Publications

• Chen C, Ahmad S, Kalra A (2019). Hydrologic Responses to Climate Change Using Downscaled GCM Data on a Watershed Scale, Journal of Water and Climate Change 10 (1), 63-77.

• MM Rahaman, B Thakur, A Kalra, S Ahmad (2019). Modeling of GRACE-Derived Groundwater Information in the Colorado River Basin, Hydrology 6 (1), 19.

• KA Tamaddun, A Kalra, M Bernardez, S Ahmad (2019). Effects of ENSO on Temperature, Precipitation, and Potential Evapotranspiration of North India’s Monsoon: An Analysis of Trend and Entropy, Water 11 (2), 189.

• Chen C, Ahmad S, Kalra A (2018). Hydrologic Responses to Climate Change Using Downscaled GCM Data on a Watershed Scale, Journal of Water and Climate Change.

• Tamaddun K, Kalra A, Ahmad S (2018). Potential of rooftop rainwater harvesting to meet outdoor water demand in arid regions, Journal of Arid Land, 10(1): 68-83.

• Bukhary S, Batista J, Ahmad S (2017). Analyzing Land and Water Requirements for Solar Deployment in the Southwestern United States, Renewable and Sustainable Energy Reviews.

• Kalra A, Sagarika S, Pathak P, Ahmad S (2017). Hydro-climatological changes in the Colorado River Basin over a century, Hydrological Sciences Journal.

• Tamaddun K, Kalra A, Bernardez M, Ahmad S (2017). Multi-scale Correlation between Western U.S. Snow Water Equivalent and ENSO/PDO Using Wavelet Analyses, Water Resources Management.

• Thakali R, Kalra A, Ahmad S (2016). Analyzing the Effects on Design Storms for Urban Stormwater Infrastructures Using Future Climate Change Scenarios, Hydrology 3(4), 34.

• Pathak P, Kalra A, Ahmad S, Bernardez M (2016). Wavelet-aided analysis to estimate seasonal variability and dominant periodicities in temperature, precipitation, and streamflow in the Midwestern United States, Water Resources Management.

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Phone: (702) 895-1585


• Expertise• Water and wastewater treatment• Water reuse• Water quality control• Adsorption processes and ion-exchange

technology• Biological nutrient removal• Bio-regeneration of ion exchange• Algal toxin treatment• Perchlorate treatment and remediation• Removal of arsenic, chromium, perchlorate,

selenium, uranium, and fluoride from water

Dr. Jacimaria Batista, P.E.Professor, Department of Civil and Environmental Engineering and Construction

March 2019 10

Environmental Engineering and Water Resources ResearchDr. Jacimaria Batista, P.E.Professor, Department of Civil and Environmental Engineering and ConstructionRecent Publications• S Mortazavian, A Saber, J Hong, JH Bae, D Chun, N Wong, D Gerrity, J Batista, K Kim, and J Moon. Synthesis, characterization, and

kinetic study of activated carbon modified by polysulfide rubber coating for aqueous hexavalent chromium removal. Journal of Industrial and Engineering Chemistry 69, 196-210 (2019).

• PP Shrestha, R Maharjan, JR Batista. Performance of Design-Build and Construction Manager-at-Risk Methods in Water and Wastewater Projects. Practice Periodical on Structural Design and Construction 24 (1), 04018029 (2018).

• M Arnold, J Batista, E Dickenson, D Gerrity. Use of ozone-biofiltration for bulk organic removal and disinfection byproduct mitigation in potable reuse applications. Chemosphere 202, 228-237 (2018).

• S Bukhary, S Ahmad, J Batista. Analyzing land and water requirements for solar deployment in the Southwestern United States. Renewable and Sustainable Energy Reviews 82, 3288-3305 (2018).

• M Sarria, JM Gonzales, D Gerrity, J Batista. Biological Reduction of Nitrate and Perchlorate in Soil Microcosms: An Electron Donor Comparison of Glycerol, Emulsified Oil, and Mulch Extract. Groundwater Monitoring & Remediation (2018).

• EJ Marti, JR Batista, RA Trenholm, ERV Dickenson (2017). Treatment of Specific NDMA Precursors by Biofiltration. Journal-American Water Works Association 109 (6).

• PP Shrestha, J Batista, R Maharjan (2016). Risks Involved in Using Alternative Project Delivery (APD) Methods in Water and Wastewater Projects. Procedia Engineering 145, 219-223.

• PP Shrestha, R Maharajan, JR Batista, B Shakya (2016). Comparison of Utility Managers’ and Project Managers’ Satisfaction Rating of Alternative Project Delivery Methods Used in Water and Wastewater Infrastructures. Public Works Management & Policy 21 (3), 263-279.

• E Christian, JR Batista, D Gerrity (2016). Use of COD, TOC, and Fluorescence Spectroscopy to Estimate BOD in Wastewater. Water environment research: a research publication of the Water Environment Federation.

• M Sharbatmaleki, RF Unz, JR Batista (2015). Potential mechanisms for bioregeneration of perchlorate-containing ion-exchange resin. Water research 75, 1-10.

• SA Begum, JR Batista (2014). Impact of butyrate on microbial selection in enhanced biological phosphorus removal systems. Environmental technology 35 (23), 2961-2972.

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Phone: (702) 895-3955


• Expertise• Water and wastewater treatment• Potable reuse• Advanced oxidation processes• Trace organic contaminants• Environmental microbiology• Online treatment monitoring

Using fluorescence to evaluate drinking water quality and identify contaminants.

Dr. Daniel GerrityAssociate Professor, Department of Civil and Environmental Engineering and Construction

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Potable reuse of water ranges from (left) a system where the wastewater of one community becomes the drinking water of another to (right) ‘planned’ potable reuse within a single community.

Cytopathogenic effects caused by infectious adenoviruses during cell culture.

Environmental Engineering and Water Resources ResearchDr. Daniel GerrityAssociate Professor, Department of Civil and Environmental Engineering and Construction

March 2019 13

Recent Publications• Bacaro, F., Dickenson, E., Trenholm, R.A., Gerrity, D. (2019). N-Nitrosodimethylamine (NDMA) formation and mitigation in potable reuse

treatment trains employing ozone and biofiltration. Environ. Sci. Water Res. Technol. In press.• Mortazavian, S., Sichani, A.S., Chun, D., Wong, N., Gerrity, D., Batista, J., Kim, K., Moon, J. (2019). Synthesis, characterization, and kinetic

study of activated carbon modified by polysulfide rubber coating for aqueous hexavalent chromium removal. J. Ind. Eng. Chem. 69, 196-210.

• Gerrity, D., Neyestani, M. (2019). Impacts of solids retention time and antibiotic loading in activated sludge systems on secondary effluent water quality and microbial community structure. Water Env. Res. In press.

• Sarria, M., Gonzales, J.M., Gerrity, D., Batista, J. (2019). Biological reduction of nitrate and perchlorate in soil microcosms: An electron donor comparison of glycerol, emulsified oil, and mulch extract. Ground Water Monit. Rem. In press. 2018

• Arnold, M., Batista, J., Dickenson, E., Gerrity, D. (2018). Use of ozone-biofiltration for bulk organic removal and disinfection byproduct mitigation in potable reuse applications. Chemosphere. 202, 228- 237.

• de Vera, G.A., Gerrity, D., Stoker, M., Frehner, W., Wert, E.C. (2018). Impact of upstream chlorination on filter performance and microbial community structure of GAC and anthracite biofilters. Environ. Sci. Water Res. Technol. 4, 1133-1144.

• Gerrity, D., Arnold, M., Dickenson, E., Moser, D., Sackett, J., Wert, E. (2018). Microbial community characterization of ozone-biofiltrationsystems in drinking water and potable reuse applications. Water Res. 135, 207-219.

• Gifford, M., Selvy, A., Gerrity, D. (2018). Optimizing ozone-biofiltration systems for organic carbon removal in potable reuse applications. Ozone Sci. Eng. 40(6), 427-440

• Christian, E., Batista, J., Gerrity, D. (2017). Use of COD, TOC, and fluorescence spectroscopy to estimate BOD in wastewater. Water Environ. Res. 89, 168-177.

• Gerrity, D., Lee, Y., Gamage, S., Lee, M., Pisarenko, A.N., Trenholm, R.A., von Gunten, U., Snyder, S.A. (2016). Development of semi-empirical models and correlations to predict trace organic contaminant abatement with UV and UV/H2O2. Environ. Sci. Water Res. Technol. 2, 460-473.


Phone: (702) 895-5804


• Expertise• Water quality data analysis• Paved road and vacant land dust emissions• Dust control• Sampling strategies, finite populations

Dr. Dave James, P.E., F.NSPEAssociate Professor,Department of Civil and Environmental Engineering and ConstructionDirector, Solar and Renewable Energy Programs

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Right: Recovering road silt from a paved road.

Above: Long-term testing of single-basin solar stills.

Above: Measuring PM10 emission rates on a paved road.


Recent Publications

• James, D. ,Schraw, G., & Kuch, F. (2019). Assessment & Evaluation in Higher Education Using the margin of error statistic to examine the effects of aggregating student evaluations of teaching. Assessment & Evaluation in Higher Education, 1-11.

• Saber, A., James, D. E., & Hayes, D. F. (2018). Effects of seasonal fluctuations of surface heat flux and wind stress on mixing and vertical diffusivity of water column in deep lakes. Advances in Water Resources, 119, 150-163.

• Saber, Ali, Milad Tafazzoli, Sorossh Mortazavian, David E. James (2018). Investigation of kinetics and absorption isotherm models for hydroponic remediation of waters contaminated with sulfate. Accepted in Journal of Environmental Management, 1 February 2018, vol. 207, pages 276-291 DOI 10.1016/j.envman.2017.11.039 .

• Saber, Ali, Soroosh Mortazavian, David E. James, and Hasti Hasheminijad (2017). Optimization of Collaborative Photo-Fenton Oxidation and Coagulation for the Treatment of Petroleum Refinery Wastewater with Scrap Iron. Journal of Water Air and Soil Pollution, July 31, 2017, vol. 228: p. 312-324. DOI 10.1007/s11270-017-3494-2.

• James, David E., Gregory Schraw & Fred Kuch (2014). Using the sampling margin of error to assess the interpretative validity of student evaluations of teaching, Assessment & Evaluation in Higher Education, 40:8, 1123-1141.

Santos, N., A. Said, D. James and N. Venkatesh (2012). Modeling solar still production using local weather data andartificial neural networks, Renewable Energy, v. 40:71-79.

China, S. and D. James (2012). Influence of pavement macrotexture on PM10 emissions from paved roads: Acontrolled study. Atmospheric Environment, v.63: 313-326.

China, S. and D. James (2012). Comparison of Laser-Based and Sand Patch Measurements of Pavement SurfaceMacrotexture, ASCE J.Transp. Eng., v.138(2): 176–181 .

Dr. Dave James, P.E., F.NSPEAssociate Professor, Department of Civil and Environmental Engineering and ConstructionDirector, Solar and Renewable Energy Programs

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Phone: (702) 774-1449


• Expertise• Removal of specific and bulk chemical contaminants from water

and wastewater focusing on process development

• Biodegradation of organic contaminants and method development for measuring biodegradability and bioavailability of bulk contaminants in water and wastewater

• Impact of nanotechnology on microbes and bioprocesses

• Fate and transport of contaminants in environment

• Stormwater pollution control

Dr. Eakalak Khan, P.E.Professor, Department of Civil and Environmental Engineering and Construction

March 2019 16

Above: A scanning electron microscopic image of the cross-section of an alginate bead with entrapped Pseudomonas putida. The P. putida cells changed their morphology from bacilli to coccoidalafter 2 weeks of entrapment and with municipal wastewater as a substrate.

Right: A conceptual diagram of entrapped cell-based enricher reactor (ER)-permeable reactive biobarrier for groundwater remediation.

Right: A scanning electron microscopic image of entrapped Pseudomonas putida in a polyvinyl alcohol bead. The P. putida cells produced nanowires after 2 weeks of entrapment and with municipal wastewater as a substrate.


Recent Publications

• Sun, Y., Lei, C., Khan, E., Chen, S.S., Tsang, D.C.W., Ok, Y.S., Lin, D., Feng, Y., and Li, X. (2018). Aging Effects on Chemical Transformation and Metal(loid) Removal by Entrapped Nanoscale Zero-valent Iron for Hydraulic Fracturing Wastewater Treatment. Science of the Total Environment, 615, pp. 498-507.

• Thuptimdang, P., Limpiyakorn, T., and Khan, E. (2017). Dependence of Toxicity of Silver Nanoparticles on Pseudomonas putida Biofilm Structure. Chemosphere, 188, pp. 199-207.

• Juntawang, C., Rongsayamanont, C., and Khan, E. (2017). Entrapped Cells-Based-Anaerobic Membrane Bioreactor Treating Domestic Wastewater: Performances, Fouling, and Bacterial Community Structure. Chemosphere, 187, pp. 147-155.

• Roy, D., McEvoy, J., Blonigen, M., Amundson, M., and Khan, E. (2017). Seasonal Variation and Ex-Situ Nitrification Activity of Ammonia Oxidizing Archaea in Biofilm Based Wastewater Treatment Processes. Bioresource Technology, 244, pp. 850-859.

• Kotchaplai, P., Khan, E., and Vangnai, A.S. (2017). Membrane Alterations in Pseudomonas putida F1 Exposed to Nanoscale Zerovalent Iron: Effects of Short-Term and Repetitive nZVI Exposure. Environmental Science and Technology, 51(14), pp. 7804-7813.

• Torres, L., Yadav, O., and Khan, E. (2017). Holistic Risk Assessment of Surface Water Contamination due to Pb-210 in Oil Produced Water from the Bakken Shale. Chemosphere, 169, pp. 627-635.

• Juntawang, C., Rongsayamanont, C., and Khan, E. (2017). Fouling Characterization in Entrapped Cells-Based Membrane Bioreactor Treating Wastewater. Separation and Purification Technology, 175, pp. 321-329.

• Chaithawiwat, K., Vangnai, A., McEvoy, J., Pruess, B., Krajangpan, S., and Khan, E. (2016). Role of Oxidative Stress in Inactivation of Escherichia coli BW25113 by Nanoscale Zero-valent Iron. Science of the Total Environment, 565, pp. 857-862.

• Kiattisaksiri, P., Khan, E., Punyapalakul, P., and Ratpukdi, T. (2016). Photodegradation of Haloacetonitriles in Water by Vacuum Ultraviolet Irradiation: Mechanisms and Intermediate Formation. Water Research, 98, pp. 160-167.

• Simsek, H., Kasi, M., Ohm, J.-B., Murthy, S., and Khan, E. (2016). Impact of Solids Retention Time on Dissolved Organic Nitrogen and its Biodegradability in Treated Wastewater. Water Research, 92, pp. 44-51.

Dr. Eakalak Khan, P.E.Professor, Department of Civil and Environmental Engineering and Construction

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Phone: (702) 895-2693Email: [email protected]

• Expertise• Water and wastewater treatment• Disinfection byproducts• Potable water reuse• Fate and transport of trace contaminants (e.g.,

estrogen, pharmaceuticals)• Environmental analytical chemistry• Advanced oxidation with ozone

Dr. Erica MartiAssistant Professor, Department of Civil and Environmental Engineering and Construction

March 2019 18

Trade-offs during disinfection in potable

water reuse.

Examples of water reuse scenarios.

Ozonation in water and wastewater treatment.

Environmental Engineering and Water Resources ResearchDr. Erica MartiAssistant Professor, Department of Civil and Environmental Engineering & Construction

March 2019 19

Recent PublicationsJournal articles• Marti, E.J., Batista, J.R., Dickenson, E.R.V. Treatment of Specific NDMA Precursors by Biofiltration. Journal - American Water

Works Association 109:6 (2017) E273-E286. DOI: 10.5942/jawwa.2017.109.0070.• Woods-Chabane, G., Glover, C., Marti, E.J., Dickenson, E.R.V. A novel assay to measure tertiary and quaternary amines in

wastewater: An indicator for NDMA wastewater precursors. Chemosphere 179 (2017) 298-305. DOI: 10.1016/j.chemosphere.2017.03.045.

• Zeng, T., Glover, C.M., Marti, E.J., Woods-Chabane, G.C., Karanfil, T., Mitch, W.A., Dickenson, E.R.V. Relative Important of Different Water Categories as Sources of N-Nitrosamine Precursors. Environmental Science and Technology 50 (2016) 13239-13248. DOI: 10.1021/acs.est.6b04650.

• Marti, E.J., Pisarenko, A.N., Peller, J., Dickenson, E.R.V. N-Nitrosodimethylamine (NDMA) Formation from the Ozonation of Model Compounds. Water Research 72 (2015) 262-270. DOI: 10.1016/j.watres.2014.08.047.

• Gerrity, D., Pisarenko, A.N., Marti, E.J., Trenholm, R.A., Gerringer, F., Reungoat, J., Dickenson, E.R.V. Nitrosamines in pilot-scale and full-scale wastewater treatment plants with ozonation. Water Research 72 (2015) 251-261. DOI: 10.1016/j.watres.2014.06.025.

• Pisarenko, A.N., Marti, E.J., Gerrity, D., Peller, J., Dickenson, E.R.V. Effects of molecular ozone and hydroxyl radical on formation of N-nitrosamines and perfluoroalkyl acids during ozonation of treated wastewaters. Environmental Science: Water Research & Technology 1, (2015) 668-678. DOI: 10.1039/C5EW00046G.

• Marti, E.J. and Batista, J.R. Impact of Sludge Handling Processes and Secondary Treatment Types on Estrogen Concentration in Wastewater Sludge. Science of the Total Environment 470–471 (2014) 1056–1067. DOI: 10.1016/j.scitotenv.2013.10.070.

Book chapter• Linge, K., Liew, D., Marti, E.J., Dickenson, E., Heitz, A., Joll, C.A. (2014). N-Nitrosodimethylamine Precursors in Wastewater:

Removal Via Activated Sludge Treatment. In C. Thompson, S. Gillespie, and E. Goslan (Eds.), Disinfection By-products in Drinking Water (14-28). Cambridge, UK: The Royal Society of Chemistry.


Phone: (702) 895-3187


• Expertise• Water uptake by plant roots at the

rhizosphere scale• Synchrotron X-ray microtomography

(XMT) imaging


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Top: Segmentation of XMT image segmentation. Bottom: Air-water interface.


Recent Publications

• Aravena, J.E. M. Berli, M. Menon, T.A. Ghezzehei, A. K. Mandava, E.E. Regentova, K.K. Potteti, N.S. Pillai, J. Steude, M.H. Young, S.W. Tyler and P.S. Nico. Synchrotron X-ray Microtomography(XMT)-New Means to Quantify Root Induced Changes of Rhizosphere Physical Properties. Tomography of Soil-Water-Root Processes, Soil Science Society (2013).

• Jazmin E. Aravena, Siul Ruiz, Ajay Kumar Mandava, Emma E. Regentova, Teamrat Ghezzehei, Markus Berli, Scott W. Tyler, Synchrotron X-Ray Microtomography (XMT) – New Means to Quantify Root Induced Changes of Rhizosphere Physical Properties, ASA, CSSA and SSSA Annual Meetings (2012).

• Jazmin E. Aravena, Siul Ruiz, Ajay Kumar Mandava, Emma E. Regentova, Teamrat Ghezzehei, Markus Berli, Scott W. Tyler, Simulating root-induced rhizosphere deformation and its effect on water flow, AGU 2011, SFO, Dec 13 - Dec 17, 2010, abstract # H51A-1182.


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Phone: (702) 895-2623


• Expertise• Microwave remote sensing• Geographic information systems (GIS)• Land scatterometry and radiometry• Remote sensing applications to water

resources and hydrologic studies• Data visualization• Integration of remote sensing, GIS, and

global position systems for Earth system science research

• Surface water hydrology• Urban thermodynamic and hydrodynamic

modeling

Dr. Haroon StephenAssociate Professor, Department of Civil and Environmental Engineering and ConstructionDirector, GIS and Remote Sensing Core Lab and Visualization Facility

March 2019 22

Results of hydrological modeling of a September 2012 on-campus flood using GIS.

The time series of inundation depth illustrates onset and temporal evolution of flooding. The underlaid

frames depict the spatial extent of flooding at selected times. This approach can be used to

assess flooding risks under various precipitation and urban development scenarios.


Recent Publications

• Abedin, S. J. H., & Stephen, H. (2019). GIS Framework for Spatiotemporal Mapping of Urban Flooding. Geosciences, 9(2), 77.

• Stephen, H. (2018). Trend Analysis of Las Vegas Land Cover and Temperature Using Remote Sensing. Land, 7(4), 135.• Edalat, M. M., & Stephen, H. (2017). Effects of two utility-scale solar energy plants on land-cover patterns using SMA of

Thematic Mapper data. Renewable and Sustainable Energy Reviews, 67(1), 1139-1152.• Lachniet, M. S., Lawson, D. E., Stephen, H., Sloat, A. R., & Patterson, W. P. (2016). Isoscapes of δ18O and δ2H reveal

climatic forcings on Alaska and Yukon precipitation. Water Resources Research, 52(8), 6575-6586.• Sawyer, P. S., & Stephen, H. (2016). Surface Cover Spectra of the Big Pine Creek Watershed. International Journal of

Research in Environmental Science, 2(1), 29-37.• Sawyer, P. S., & Stephen, H. (2015). Climate Driven Vegetative Composition Changes in the Big Pine Creek Watershed

Using Spectral Mixture Analysis and Time Series Analysis of Landsat Surface Reflectance Data over a 30 Year Period. Journal of Biodiversity Bioprospecting and Development, 2(146), 2376-0214.

• Acharya, A., Piechota, T.C., Stephen, H., & Tootle, G. (2011). Modeled streamflow response under cloud seeding in the North Platte River watershed. Journal of Hydrology, 409(1), 305-314, doi: 10.1016/j.jydrol.2011.08.027.

• Puri, S., Stephen, H., & Ahmad, S. (2011). Relating TRMM precipitation radar land surface backscatter response to soil moisture in the Southern United States. Journal of Hydrology, 402(1), 115-125, doi: 10.1016/j.jhydrol.2011.03.012.

• Stephen, H., Ahmad, S., Piechota, T. C., & Tang, C. (2010). Relating surface backscatter response from TRMM precipitation radar to soil moisture: results over a semi-arid region. Hydrology and Earth System Sciences, 14, 193-204, doi:10.5194/hess-14-193-2010.

• Ahmad, S., Kalra, A., & Stephen, H. (2010). Estimating soil moisture using remote sensing data: A machine learning approach. Advances in Water Resources, 33(1), 69-80, doi: 10.1016/j.advwatres.2099.10.008.

Dr. Haroon StephenAssociate Professor, Department of Civil and Environmental Engineering and ConstructionDirector, GIS and Remote Sensing Core Lab and Visualization Facility

March 2019 23

Documents

Environmental Engineering and Water Resources Research...Environmental Engineering and Water Resources Research. Dr. Sajjad Ahmad, P.E. Chair & Professor, Department of Civil and Environmental