Author(s): Jong-Kyu Lee; Joo-Young Kim; Kwang Seok Yoon; Yong-Sik Cho
Linked Author(s):
Keywords: Estuary barrage; Flood forecasting system; Storage function model; Reservoir routing; Backwater effect
Abstract: The Geum River is located south of Seoul, Korea. The length of the main stream is 397. 79 km and an estuary barrage is located at the end of the river. The Geum River Estuary Barrage was constructed in 1990 to supply agricultural water to the downstream farmland of the Man Gyung River and to provide water for municipal and industrial uses in the cities of Gunsan, Iksan and Jeonju. The Geum River Control Office has a flood forecasting system; however, the current system does not consider the backwater effects. As a result, it is very difficult to give correct flood information, and it is difficult to accurately assess the water resource supply and saltwater invasion into freshwater, as frequently occurs due to over-discharge during floods. Especially, the tidal range at this location is about 6 m, and as a result the tidal effect is extremely important on this river. In this study, we investigate the flood forecasting system for the Geum River reach influenced by the estuary barrage. The current system cannot consider the backwater effect because the estuary barrage blocks the end of the river. We calculated the discharge from the tide lock and evaluated the inside water level of the estuary barrage during floods. The results show that the calculation agrees well with the observed data at the river stage stations in the Geum River. The results also show that this program is a reasonable substitute for the current system.
Year: 2007