Flood Nonstationarity in the Southeast and Mid-Atlantic Regions of the United States
Publication: Journal of Hydrologic Engineering
Volume 19, Issue 10
Abstract
A case study examining aspects of nonstationarity in the estimation of flood magnitudes in the Southeast and mid-Atlantic United States is presented here. The focus is on challenges posed by changes in the number and location of stream gauges over time to assess climate variability and land-use land-cover (LULC) change impacts. The study shows that statistical outliers are spatially aligned with LULC change from urbanization independently of time period and record length across the region with substantial increases () in the magnitude of the 25-year and 100-year events since 1950. Large amplification () of the ratio of flood magnitude to the mean annual flood was detected in expanding urban areas, but only systematically for the 100-year event, suggesting that existing infrastructure constrains the sensitivity of flood response for events below applied engineering design criteria. Overall, annual streamflows do not exhibit statistically significant trends (98% cfl), except for positive trends in urban areas (), and negative trends in regulated rivers and regions of karst processes (). The critical importance of long-term, high-density observing networks as the basis to assess and interpret climate change and LULC impacts is stressed.
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Acknowledgments
The figures in this manuscript were drawn by Ms. Yajuan Duan (second author). The authors thank Dr. Rolf Olsen (Institute for Water Resources, U.S. Army Corps of Engineers), and four anonymous reviewers and the editors for their insightful comments and suggestions that helped improve the manuscript.
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Published In
Journal of Hydrologic Engineering
Volume 19 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 22, 2013
Accepted: Dec 7, 2013
Published online: Dec 10, 2013
Published in print: Oct 1, 2014
Discussion open until: Nov 30, 2014
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