1. Hydrologic and Water Quality Responses to Precipitation Extremes in Nakdong River Basin
- Author
-
Jae Ho Jang and Jong Ho Ahn
- Subjects
Pollutant ,Wet season ,Hydrology ,geography ,geography.geographical_feature_category ,Flood myth ,Drainage basin ,Environmental science ,SWAT model ,Precipitation ,Water quality ,Surface runoff - Abstract
SWAT model is applied to simulate rainfall-runoff and pollutant loadings in the Nakdong River basin as the condition for extreme droughts and floods. The year 1994 and 2002 are chosen as the drought and flood year, respectively, through the analysis of past rainfall data for 30 years. The simulation results show decreases in both runoff and pollutant loadings for the drought year but increases for the flood year. However, the pollutant loadings on some upper sub-basins increase for drought year due to highly-regulated dam discharge and soil moisture change. Collectively, extreme droughts and floods have negative impacts on water quality, showing elevated SS loadings during wet season and concentrated T-P concentrations during low flow season. The extent of these impacts is highly influenced by antecedent dry days and precipitation patterns.
- Published
- 2012