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http://dx.doi.org/10.3741/JKWRA.2009.42.5.425

Change in Stream Morphology after Gongneung Weir 2 Removal  

Choi, Sung-Uk (Department of Civil & Environmental Engineering, Yonsei University)
Lee, Hea-Eun (River, Coastal and Harbor Research Division, KICT, Graduate Student in School of Civil & Environmental Engineering, Yonsei University)
Yoon, Byung-Man (Department of Civil & Environmental Engineering, Myongji University)
Woo, Hyo-Seop (River, Coastal and Harbor Research Division, KICT)
Publication Information
Journal of Korea Water Resources Association / v.42, no.5, 2009 , pp. 425-432 More about this Journal
Abstract
Gongneung Weir 2 was built in 1970s to supply water for irrigation. For a long time, the weir was left uncared because of the land use change of the nearby area. The weir is 1.5 m high, and the stream in which the weir was installed has bed materials of fine sands to fine gravels. In 2006, the local government and residents agreed on uninstalling the weir, and the weir was removed completely on April 14. This paper reports the results of three field investigations for the study of the stream morphology change after the weir removal. Changes in grain size distribution, bed elevation, and cross section before and after the weir removal are provided and discussed. Net amount of sediment deposits within 1 km reach of the stream is estimated, and the results illustrates that the sediment process, leading to an equilibrium of the bed, progressed very swiftly, namely within 45 days.
Keywords
weir removal; morphology; sediment transport; equilibrium bed;
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