| Title |
Operational Water Quality Forecast for the Nakdong River Basin Using HSPF Watershed Model |
| Authors |
신창민 ( Chang Min Shin ) ; 김경현 ( Kyunghyun Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.6.570 |
| Keywords |
Chlorophyll-a; Forecast; HSPF; Nakdong River |
| Abstract |
A watershed model was constructed using Hydrological Simulation Program Fortran to predict the water quality, especially chlorophyll-a, at major tributaries of Nakdong River basin, Korea. The BOD export loads for each land use in HSPF model were estimated to 1.47~8.64 kg/km2/day, which of values were similar to the domestic monitoring export loads. The T-N and T-P export loads were estimated to 0.618~3.942 kg/km2/day and 0.047~0.246 kg/km2/day, slightly less than the domestic monitoring data but within the range of foreign literature values. The model was calibrated at major tributaries for a three-year period (2008 to 2010). The deviation values ranged from -31.5 to 1.6% of chlorophyll-a, -24.0~2.2% of T-N, and -5.7~34.8% of T-P and root mean square error (RMSE) ranged from 4.3~44.4 ug/L of chlorophyll-a, -0.6~1.5 mg/L of T-N, and 0.04~0.18 mg/L of T-P, which show good calibration results. The operational water quality forecasting results for chlorophyll-a presented in this study were in good agreement with measured data and had a similar accuracy with model calibration results. |