SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Assessment of flow regulation effects by dams in the Han River, Korea on the downstream flow regimes using SWAT 
Authors:Kim, N.W., J.E. Lee and J.T. Kim 
Year:2012 
Journal:Journal of Water Resources Planning and Management 
Volume:138(1) 
Pages:24-35 
Article ID: 
DOI:10.1061/(ASCE)WR.1943-5452.0000148 
URL (non-DOI journals): 
Model:SWAT 
Broad Application Category:hydrologic only 
Primary Application Category:impoundment and/or wetland effects 
Secondary Application Category:hydrologic assessment 
Watershed Description:26,919 km^2 Han River in north central South Korea 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:A method for the precise assessment of the effects of flow regulation by dams on the downstream flow regimes, using daily runoff simulation model, has been suggested in this study. The Soil and Water Assessment Tool (SWAT) was used to evaluate the effects of flow regulation of the upstream Soyanggang and Chungju multi-purpose dams on the downstream flow regimes at the inlet of the Paldang Dam, a major water supply source of the Seoul metropolitan area, in the Han River basin, Korea. The model was calibrated using the observed regulated inflows to the Paldang Dam. The flow duration curves for the inflows and outflows of the Soyanggang and Chungju Dams were used to evaluate the effects of storage of the two dams. The Soyanggang Dam was simulated as storing 0.74 billion m3 of water during a 46 day high flow period, with this volume then released during the 319 days of the low flow period. Similarly, the Chungju Dam was evaluated as storing 1.03 billion m3 of water during a 19 day period, with this stored water then released during a 346 day period. To evaluate the effects of regulation by the two dams on the downstream flow regimes, regulated and unregulated flow duration curves were constructed and analyzed. At the inlet of the Paldang Dam, the regulated volumes, the surplus water due to the regulation of the dam, by the Soyanggang, Chungju and both dams were 0.91, 1.25 and 2.16 billion m3, respectively, with regulation durations of 302, 337 and 311 days, respectively. This method was revealed to be able to accurately reconstruct the flow duration curves, and then successfully evaluate the effects of regulation by the dams on the downstream flow regimes. The method proposed in this study is the first to accurately reconstruct the natural flow regime, and it is anticipated that the results of this study will be useful in the evaluation of the effects of flow regulation, as well as water resources planning and management. 
Language:English 
Keywords:flow regulation effects; daily runoff simulation; SWAT; flow duration curves; natural flow regime