| Title |
Water Quality Modeling Study of the Impounded Stream |
| Authors |
이건호 ; 박석순 ( Geon Ho Yi ; Seok Soon Park ) |
| Abstract |
A water quality modeling study was performed for the impounded stretches of the North Branch of the Han River. The constructed model was based on the Dynamic Hydraulic Model Version 4 (DYNHYD4) and the Enhanced Stream Quality Model (Qual 2E) which were developed by United States Environmental Protection Agency. The study area includes the Lake Uiam, two upstream branches(Soyang River from Soyang Dam and the North Branch of the Han River from Chuncheon Dam), and downstream to the Kangkyung Bridge, Kapyung. The study area was divided into 56 junctions and 59 channels for DYNHYD4 and 19 reaches for Qual 2E. Field data were obtained from two synoptic sampling survey during March and May 1991 for two consecutive days. Both models were calibrated to the March survey data and verified to the May survey data. The DYNHYD4 model was validated using the conductivity measurements as a conservative indicator. The hydraulic data simulated by the DYNHYD4 Model were used for the flow balance in the Qual 2E model. The water quality parameters simulated in the Qual 2E Model includes Dissolved Oxygen, 5-day Biochemical Oxygen Demand, Total Suspended Solids, Nitrogen Series, and Phosphorous Series and selected parameters were presented in this paper. The model study indicated that the combined approach of DYNHYD4 and Qual 2E was adequate to simulate the water qualities in the complicated system of the impounded stream. It was notable that the photosynthesis of periphyton and the sediment oxygen demand would cause discernible impact on dissolved oxygen level over entire system. |