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Mohamad Hejazi

Mohamad Hejazi

Integrated Modeling & Energy


Mohamad Hejazi is a research scientist with the Joint Global Change Research Institute (JGCRI) and the Pacific Northwest National Laboratory. He holds a Ph.D. (2009) from the University of Illinois at Urbana-Champaign, and a B.S. (2002) and M.S. (2004) degrees from the University of Maryland, College Park. His research interests include: global hydrologic modeling, global and regional sectoral water demand models, separating the effect of climate change, human activities, and climate policies on hydrology, and the value of information (e.g. weather and climate forecasts) to human decisions (e.g., farmers, reservoir operators). Prior to joining JGCRI-PNNL, he worked as a postdoctoral research associate at the University of Illinois Urbana-Champaign and as a research assistant at the USGS and the Illinois Water Survey.

Research Interests

  • Modeling water demand and availability in global integrated assessment models;
  • Understanding the water-energy-land-climate interactions;
  • Watershed, regional, and global hydrologic modeling, reservoir operation and optimization, and water scarcity assessment;
  • Climate change impact assessment on water resources, and separating the effect of climate change and human activities on hydrology;
  • Impact of climate change mitigation policies on hydrology;
  • Systems analysis, heuristic optimization techniques, and model calibration

Education and Credentials

  • University of Maryland, College Park, Maryland, B.S. in Civil & Environ. Engineering, May 2002
  • University of Maryland, College Park, Maryland, M.S. in Civil & Environ. Engineering, May 2004
  • University of Illinois, Urbana-Champaign, Illinois, Ph.D. in Civil & Environ. Engineering, Aug. 2009
  • University of Illinois, Urbana-Champaign, Illinois, Postdoctoral Research Associate, Water Resources Management, Aug. 2009 " Oct. 2010

Affiliations and Professional Service

  • Editorial Board Member of the Journal of Irrigation & Drainage Systems Engineering
  • Member of American Geophysical Union (AGU)
  • Member of Env. and Water Resource Systems Committee

Awards and Recognitions

  • 2012 Best Research-Oriented Paper, the Environmental and Water Resources Institute of the American Society of Civil Engineers and the Journal of Water Resources Planning and Management, presented at the EWRI Congress, Albuquerque, New Mexico, May 2012.

PNNL Publications


  • Chaturvedi V, MI Hejazi, JA Edmonds, LE Clarke, GP Kyle, E Davies, MA Wise, and KV Calvin. 2013. Climate policy implications for agricultural water demandPNNL-22356, Pacific Northwest National Laboratory, Richland, WA. 
  • Hejazi MI, JA Edmonds, V Chaturvedi, E Davies, and J Eom. 2013. "Scenarios of Global Municipal Water-Use Demand Projections over the 21st Century." Hydrological Sciences Journal 58(3):1-20.  doi:10.1080/02626667.2013.772301
  • Kyle GP, E Davies, JJ Dooley, SJ Smith, LE Clarke, JA Edmonds, and MI Hejazi. 2013. "Influence of Climate Change Mitigation Technology on Global Demands of Water for Electricity Generation." International Journal of Greenhouse Gas Control 13:112-123.  doi:10.1016/j.ijggc.2012.12.006
  • Voisin N, L Liu, MI Hejazi, TK Tesfa, H Li, M Huang, Y Liu, and LYR Leung. 2013. "One-way coupling of an integrated assessment model and a water resources model: evaluation and implications of future changes over the US Midwest ." Hydrology and Earth System Sciences 17(No. 11):4555-4575.  doi:10.5194/hess-17-4555-2013


  • Hejazi MI, JA Edmonds, and V Chaturvedi. 2012. "Global irrigation demand - A holistic approach." Irrigation & Drainage Systems Engineering 1(2):Article No. e106. 


  • Cai X, MI Hejazi, and D Wang. 2011. "Value of Probabilistic Weather Forecasts: Assessment by Real-Time Optimization of Irrigation Scheduling." Journal of Water Resources Planning and Management 137(5):391-403.  doi:10.1061/(ASCE)WR.1943-5452.0000126
  • Wang D, and MI Hejazi. 2011. "Quantifying the relative contribution of the climate and direct human impacts on mean annual streamflow in the contiguous United States." Water Resources Research 47:Article No. W00J12.  doi:10.1029/2010WR010283

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