Effect of Flow Pulses on Degradation Downstream of Hapcheon Dam, South Korea
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 1
Abstract
The changes in channel geometry downstream of Hapcheon Dam, South Korea, are closely examined. Daily pulses of water from peak hydropower generation and from sudden sluice gate operations affect the 45-km reach of the Hwang River between the Hapcheon Reregulation Dam and the Nakdong River. From 1983 to 2003, the median bed-material size, , increased from 1.0 to 5.7 mm, and the bed slope of the reach decreased from 94 to 85 cm/km. The vertical riverbed degradation averaged 2.6 m for a distance of 20 km below the reregulation dam. A simple analytical model is developed to predict the increase in sediment transport and the river bed adjustments from flow pulses in comparison with steady flow discharges. Numerical model simulations confirm the theoretical prediction that sediment transport rates from daily pulses are 21% higher than for steady flow discharges. Unsteady sediment transport simulations indicate that the channel bed degradation should extend mostly 20–25 km below the reregulation dam and should not change much after 2013.
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Acknowledgments
This paper is primarily the result of the analysis of the first writer during his Ph.D. studies at Colorado State University. Financial support from the Korea Water Resources Corporation (K-water) during the course of the study is gratefully acknowledged. However, the results do not necessarily reflect policies or endorsement of K-water. The writers are grateful to Hyosub Cho, Jungyup Kim, and Changrae Jang and Jahun Jun at K-water who individually contributed to this study. We finally appreciate the helpful comments of the anonymous reviewers and the editorial board of the journal.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 1 • January 2011
Pages: 100 - 111
Copyright
© 2011 ASCE.
History
Received: Nov 6, 2007
Accepted: May 20, 2010
Published online: Dec 15, 2010
Published in print: Jan 2011
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