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Professor Heejun Chang
Professor Heejun Chang

Department Chair


Ph.D. Geography (2001),
 Pennsylvania State University, University Park, PA
M.A. Geography (1996),
 Seoul National University, Seoul, Korea
B.A. Geography (1994),
 Seoul National University, Seoul, Korea

Research Interests

Hydrology and water resources, with focus on human modification of the hydrologic system and interactions among climate change, land use change, and water management as they affect water quantity, quality, demand, and hydrologic ecosystem services.



Heejun Chang is a Professor and Chair of Geography at Portland State University. He has served as the Willamette River basin representative of the UNESCO-HELP (Hydrology, Environment, Life and Policy) program. He also served as a lead author of the freshwater section of the 1st Oregon Climate Assessment Report. He is dedicated to investigate water sustainability in a changing climate, land cover, management, and has been leading interdisciplinary water research from a coupled natural and human system lens. Dr. Chang has authored and served as a reviewer of more than 80 geographical, hydrologic, and environmental sciences journals. He has co-authored 19 edited book chapters and authored 98 peer-reviewed papers, and his work has been cited more than 4000 times by google scholar. He is a Fellow of the Institute for Sustainable Solutions and the Chair of the Spatial and Analysis and Modeling Specialty Group of the American Association of Geographers. He is the past president of Korea-America Geospatial and Environmental Scientists Association. Professor Chang’s areas of research interest include impacts of climate change on regional water resources, land cover change and water quality, urban water demand, and water-related ecosystem services. His research has been funded by US National Science Foundation, National Oceanic and Atmospheric Administration, US Environmental Protection Agency, US Forest Service, US Department of Agriculture, US Geological Survey, US Army Corp of Engineers, and Korea Ministry of Science and Education.


Recent Publication

McPhillips, L.E., Chang, H, Chester, M.V., Depietri, Y., Friedman, E., Grimm, N.B., Kominoski, J.S., McPhearson, T., Méndez-Lázaro, P., Rosi, E. J., Shiva, J.S. (2018) Defining extreme events: a cross-disciplinary review. Earth’s Future. 
Watson, E.* Chang, H. (2018) Relation between stream temperature and landscape characteristics using distance weighted metrics, Water Resources Management 32(3): 1167-1192. 
Chang, H., Watson E.*, Strecker, A. (2017) Chapter 8: Climate Change and Steam Temperature in the Willamette River Basin: Implications for fish habitat, in Bridging Science and Policy Implications for Managing Climate Extremes. World Scientific Publishing, pp. 119-132.

Jaeger, K.W.  Amos, A., Bigelow, D.P., Chang, H., Conklin, D.R., Haggerty, R., Langpap, C., Moore, K., Mote, P., Nolin, A., Plantinga, A. J., Schwartz, C., Tullos, D., Turner, D.T., Finding water scarcity amid abundance using human-natural system models, Proceedings of the National Academy of Sciences 111(45): 11884-11889.

Cho, S. and Chang, H. (2017) Recent Research Approaches to Urban Flood Vulnerability2006-2016, Natural Hazards 88(1): 633-649

Chang, H.Bonnette, M.*, Stoker, P., Crow-Miller, B., Wentz, E., (2017) Determinants of single family residential water use across scales in four western US cities, Science of the Total Environment 596/597: 451-464.

Chang, H.Bonnette, M.R. (2016) Climate change and water-related ecosystem services: Impacts of drought in California, USA, Ecosystem Health and Sustainability 2: e01254