RESEARCH

          As a broadly trained geographer, my research interests encompass in the realm of physical/environmental geography and geographic information science. My past research in the graduate school at the Pennsylvania State University includes constructing a GIS-based distributed hydrologic model for a large river basin in Bulgaria, assessing potential impacts of climate change on hydrology and water resources for the Mid-Atlantic Region of the United States, and simulating spatiotemporal variations of water quality for a tributary of the Danube River. Building upon my dissertation research, which examines complex interactions of climate change and land use change in streamflow and nutrient loads for Pennsylvania watersheds, I am currently investigating forms and processes of dynamic watershed systems in urbanizing areas of the Pacific Northwest and large river basins in Korea. My current research projects include 1) Hydrology and water quality effects of urbanization and climate change, 2) Comparative studies of urban stream restoration, 3) Use of weather and climate information for resilient water resource management including flood hazard, and 4) Assessing the effectiveness of geovisualization in teaching spatial quantitative analysis. Integrating and coupling of biophysical and human factors are essential for studying complex watershed systems. Thus, my emphasis in using various geocomputational methods developed in GIScience and artificial intelligence is aimed at representing watersheds as complex, hierarchical, and nested systems created and modified by hybrid natural and anthropogenic factors. My other research interest, in integrated regional assessment, is aimed at understanding causes and consequences of global climate change in local places. Hence, my research is integrative and interdisciplinary in nature, which is increasingly important for collaborative research. U.S. National Science Foundation and Korea Ministry of Science and Technology are currently funding my research studies.


          "Two roads diverged in a wood, and I - I took the one less traveled by, And that has made all the difference."  - Robert Frost


PUBLICATIONS

1) Hydrology and Water Resources

* Student author

 

Chang, H. and W-T. Kwon (2007) Spatial patterns of summer precipitation trends in Korea, 1973-2005 Environmental Research Letters (in press)

 

Bae, D-H. Jung, I-W., and Chang. H. (2007) Potential changes in Korean water resources using a high resolution climate simulation. Climate Research (in press)

 

Levell, A.* and H. Chang (2007) Monitoring the Channel Process of a Stream Restoration Project in an Urbanizing Watershed: A Case Study of Kelley Creek, Oregon, USA River Research and Applications (in press)

 

Bae, D-H, I-W. Jung, and H. Chang (2007) Long-term trend of precipitation and runoff in Korean river basins. Hydrological Processes (in press)

 

Knight, C. G., B. M. Evans, J. M. Hamlett, D.W. Lehning, M. P. Staneva, J. J. Carmichael T. N. Hristov, D. Dimitrov, V. D. Ioncheva, I. I. Nikolov, and H. Chang (2007) REKA: A Catchment Management Tool for Improving Water Quality. pp.129-138 In “Managing Water Resources in a Changing Physical and Social Environment” edited by Robinson, P.J., Jones, T., and Woo, M-K. International Geographical Union Home of Geography Publication Series, Societą Geografica Italiana, Rome, 177pp

 

Chang, H., J. Franczyk,* I-S Im, W-T. Kwon, D-H. Bae, and I-W. Jung (2007) Vulnerability of Korean water resources to climate change and population growth. Water Science and Technology 56(4): 57-62.

 

Chang, H. (2007) Comparative streamflow characteristics in urbanizing basins in the Portland Metropolitan Area, Oregon, USA, Hydrological Processes 21(2): 211-222 (DOI: 10.1002/hyp6233)

 

Graves, D and H. Chang (2007) Hydrologic impacts of climate change in the Upper Clackamas basin of Oregon. Climate Research 33(2): 143-157

 

Chang, H. J. Franczyk, and D-H. Bae (2006) Putting climate change into water resource management: Adaptation efforts in the U.S. U.K., Canada, Australia, and the Netherlands. Journal of Environmental Policy 5(4): 19-50.

 

Chang, H. (2006) City and Hydrology, in “Urban Geography and Urbanology” edited by Kim, I. And Park, S. Purungil Publisher. Seoul, Korea (ISBN: 89-87691-67-5).

 

Chang, H. and T. N. Carlson (2005) Water Quality During Winter Storm Events in Spring Creek, Pennsylvania, USA, Hydrobiologia, 544:321-332.

 

Chang, H. (2005) Spatial and Temporal Variations of Water Quality in the Han River and its Tributaries, Seoul, Korea, 1993-2002. Water, Air, and Soil Pollution, 161: 267-284.

 

Chang, H. and T. N. Carlson (2004) Patterns of Nitrate and Phosphorus Transport in Central Pennsylvania Streams. The Pennsylvania Geographer. 42(2): 61-74

 

Chang, H. and C. Kim (2004) Recent research trends in American Geomorphology and Hydrogeography, Journal of the Korean Geographical Society. 39(6): 873-887

Chang, H. (2004) Water Quality Impacts of Climate and Land Use Changes in Southeastern Pennsylvania, The Professional Geographer, 56(2): 240-257.

Chang, H. (2003) Basin Hydrologic Response to Changes in Climate and Land Use: The Conestoga River Basin, Pennsylvania. Physical Geography, 24(3): 222-247.

Chang, H., C. G. Knight, M. P. Staneva, and Kostov, D. (2002) Water Resource Impacts of Climate Change in Southwestern Bulgaria. GeoJournal, 57: 115-124.

Chang, H. (2002) Spatial variations of nutrient concentrations in Pennsylvania Watersheds. Journal of the Korean Geographical Society, 37(5): 536-550.

Chang, H., B. M. Evans, and D. R. Easterling. (2001) The Effects of Climate Change on Stream Flow and Nutrient Loading. Journal of the American Water Resources Association, 37: 973-985.

Knight, C. G., H. Chang, M. Staneva, and D. Kostov. (2001) A Simple Basin Model for Simulating Runoff: The Struma River GIS. The Professional Geographer, 53(4): 533-545.

Knight, C. G., J. J. Carmichael, H. Chang, D. Dimitrov, B. M. Evans, J. M. Hamlett, T. N. Hristov, V. D. Ioncheva, I. I. Nikolov, M. P. Staneva, and P. S. Varbanov. (2001) Comprehensive Watershed Management: A Spatial Water Quality Assessment System. Report for U.S. National Science Foundation. University Park and Sofia, PA and Bulgaria.

Neff, R., H. Chang, C. G. Knight, R. Najjar, B. Yarnal and H. Walker. (2000) Impacts of Climate Variation and Change on Mid-Atlantic Region Hydrology and Water Resources. Climate Research, 14: 207-218.

Yarnal, B., R. Neff, H. Chang, and W. Pike. (2000) Freshwater Quantity and Quality. in Mid-Atlantic Regional Assessment Team (eds.), Preparing for a Changing Climate:  The Potential Consequences of Climate Variability and Change. pp. 121-177. The Pennsylvania State University. University Park, PA.

2) Integrated Regional Assessment of Global Climate Change

Chang, H., J. Franczyk, D-H. Bae, I-W. Jung , I-S Im,, and W-T. Kwon, (2007) Effects of Climate Change and Population Growth on water resources in Korea. International Association of Hydrological Sciences 315

Chang, H. (2002) The Political Economy of Carbon Dioxide Emissions in Three Asian Countries. Asian Perspective, 26(2): 237-267.

Knight, C.G., D. Abler, E. Barron, J. Carmichael, H. Chang, R. Crane, M. Easterling, W. Easterling, A. Fisher, A. Glasmeier, P. Kocagil, S. Lachman, S. Matthews, C. Polsky, A. Rose, J. Shortle, L. Tran, and B. Yarnal. (2003) A Framework for Integrated Regional Assessment of Global Climate Change. University Park, PA.

Chang, H. and C. G. Knight. (1999) A Conceptual Model for Climate Impact Assessment: Integrated Regional Assessment, Publications of the Annual Meeting of the Korean Geographical Society, pp. 56-59. Pusan, Korea (In Korean).


CONFERENCE PRESENTATIONS

Chang, H. and Poracsky, J. A graphical approach to spatial quantitative methods. Annual Meeting of the Association of Pacific Coastal Geographers, Long Beach, CA, October 19, 2007.

 

Chang, H., J. Franczyk, D-H. Bae, I-W., Jung, E-S. Im, W-T. Kwon, Effects of climate change and population growth on Korean water resources. International Association of Hydrological Sciences, Perugia, Italy, July 10, 2007

 

Chang, H., Challenges and opportunities for teaching water resources, Teaching water resources at the Undergraduate level. Panelist, 103rd Annual Meeting of the Association of American Geographers, San Francisco, CA, April 21, 2007.

 

Kim, C. and Chang, H. Who is responsible for increasing flood hazards? The case of Gangwon province of Korea. 103rd Annual Meeting of the Association of American Geographers, San Francisco, CA, April 20, 2007.

 

Chang, H., J. Franczyk, and D-H. Bae, Climate change and future flood regimes. International workshop, The science and practice of flood disaster management in urbanizing Monsoon Asia, Chiang Mai, Thailand, April 5, 2007.

 

Chang, H., Kim, C. and Franczyk, J., Flood hazards and in urban areas of Korea and implications of climate change, International workshop, The science and practice of flood disaster management in urbanizing Monsoon Asia, Chiang Mai, Thailand, April 5, 2007.

 

Chang, H., J. Franczyk, D-H. Bae, I-W., Jung, E-S. Im, W-T. Kwon, Integrated regional assessment of climate change for Korean river basins. American Geophysical Union, San Francisco, CA, December 12, 2006. 

 

Chang, H., Franczyk, J. Im, E-S., Kwon, W-T. Bae , D-H, Jung, I-W. Assessing vulnerability of Korean water resources under the changing environment , “Innovations in coping with water and climate related risks” Amsterdam, 25 September, 2006.

Chang H. Teaching quantitative methods at the dawn of the 21st century. Annual Meeting of the Association of Pacific Coastal Geographers, Eugene, OR, September 8, 2006.

 

Franczyk, J. and Chang, H. Spatial patterns of Oregon water use. Annual Meeting of the Association of Pacific Coastal Geographers, Eugene, OR, September 7, 2006.

Chang, H. Kim, C. and Franczyk, J. Spatial and temporal variations of flood hazards in Korea , American Geophysical Union Joint Assembly, Baltimore, Maryland, May 25, 2006.

Chang, H. and Boeder, M. Trends in surface water quality for Korean river basins , American Geophysical Union Joint Assembly, Baltimore, Maryland, May 25, 2006.

Chang, H. Poracsky, J. and Bulman, T. Does graphical visualization help students’ understanding of quantitative geography?, 102nd Annual Meeting of the Association of American Geographers, Chicago, IL, March 9, 2006.

Chang, H. and Boeder, M. Assessment of water quality trends in the Han River basin, Korea, Oregon Academy of Sciences, Eugene, OR, February 25, 2006.

Franczyk, J. and Chang, H. Korean water use: trends and forecasts, Oregon Academy of Sciences, Eugene, OR, February 25, 2006.

Dougall, J. Fountain, A. and Chang, H. Downstream effects of glaciers on stream water quality, Oregon Academy of Sciences, Eugene, OR, February 25, 2006.

Chang, H. and J. Poracsky, T. Bulman. Teaching Quantitative Methods Using Visualization. Annual Meeting of the Association of Pacific Coastal Geographers, Tempe, AZ, October 21, 2005.

Chang, H. Spatial Patterns of Water Quality in the Han River basin, Seoul, Korea, The 100th Annual Meeting of the Association of American Geographers, Denver, April, 2005.

Chang, H. and M. Boeder, Multivariate Analysis of Water Quality in the Tualatin River basin, OR. Annual Meeting of Oregon Academy of Sciences, Corvallis, February 26th, 2005.

Chang, H. and M. Boeder, Spatial Patterns of Water Quality in the Tualatin River basin, Third Annual Urban Ecology and Conservation Symposium, Portland, January 28th, 2005.

Chang, H. Stream Restoration in Urban Areas: The Case of Portland and Seoul Metropolitan Areas, The 100th Annual Meeting of the Association of American Geographers, Philadelphia, March 16th, 2004.

Chang, H. Hydrologic Effects of Urbanization in the Portland Metropolitan Area. Annual Meeting of Oregon Academy of Sciences, Portland, February 28th, 2004.

Chang, H. Effects of Urbanization on Streamflow in Northwestern Oregon Watersheds. Annual Meeting of the Association of Pacific Coast Geographers, Portland, September 20th, 2003.

Chang, H. Interactions of climate Change and Land use Change in Water Quality. The 99th Annual Meeting of the Association of American Geographers, New Orleans, March 6th, 2003.

Chang, H. Assessing Hydrologic Impacts of Climate Change at the Watershed Scale. American Institute of Hydrology. Portland, OR, October 2002.

Chang, H. and T.Carlson. Storm Water Related Pollutant Transport in Urbanizing Watersheds. The 98th Annual Meeting of the Association of American Geographers, Los Angeles, CA, March 21, 2002.

Hamlett, J.M., C.G.Knight, B.M. Evans, J.J. Carmichael, T.N. Hristov, V.D. Ioncheva, D.Dimitrov, I.I. Nikolov, H. Chang, and M.P. Staneva.  Yantra Basin Decision Support System:  Linking GIS with Nonpoint Source and In-stream Models. The 2001 ASAE Annual International Meeting, July 29-August 1, 2001, Sacramento, CA.

Knight, C.G., H. Chang, and M.P. Staneva. Vulnerability of Water Resources to Climate Change: The Case of Bulgaria. International Geosphere-Biosphere Pannel of Global Change Open Science Conference, July 2001. 

Chang, H. A Basin’s Response to Environmental Change: Impacts of Climate and Land Use Change on Water Quality. The 97th Annual Meeting of the Association of American Geographers, New York, New York, March 1, 2001.

Chang, H. Using Artificial Neural Networks to Predict Streamflow and Nitrogen Loads under Climate Variability and Change. 29th International Geographical Congress. Seoul, Korea, August 17, 2000.

Chang, H., B.M. Evans, and D.R. Easterling. The Effects of Climate Variation and Change on Nutrient Loading. The 96th Annual Meeting of the Association of American Geographers (AAG), Pittsburgh, Pennsylvania, April 6, 2000.

Chang, H. and C.G. Knight. A Conceptual Model for Assessing Climate Impacts: Integrated Regional Assessment. Korean Geographical Society, Pusan, Korea, May 28, 1999.

Chang, H., C.G. Knight, D. Kostov, and M. Staneva. A Hydrological Simulation Model for the Struma River Basin Using GIS. The 95th Annual Meeting of the Association of American Geographers (AAG), Honolulu, Hawaii, March 24, 1999.

Knight, C.G., D. Abler, E. Barron, J. Carmichael, H. Chang, R. Crane, M. Easterling, W. Easterling, A. Fisher, A. Glasmeier, P. Kocagil, S. Lachman, S. Matthews, C. Polsky, A. Rose, J. Shortle, and B. Yarnal. A Framework for Integrated Regional Assessment of Global Climate Change. The 95th Annual Meeting of the Association of American Geographers, Honolulu, Hawaii, March 26, 1999.


PROFESSIONAL ASSOCIATIONS

Association of American Geographers

American Geophysical Union

Korean Geographical Society

 

Oregon Academy of Sciences

 

International Association of Hydrological Sciences