| Title |
Study on Estimation and Application of Discharge Coefficient about Nonpoint Source Pollutants using Watershed Model |
| Authors |
황하선 ( Ha Sun Hwang ) ; 이한필 ( Han Pil Rhee ) ; 박지형 ( Jihyung Park ) ; 김용석 ( Yong Seok Kim ) ; 이성준 ( Sung Jun Lee ) ; 안기홍 ( Ki Hong Ahn ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.6.653 |
| Keywords |
Discharge coefficient; HSPF; Korean TMDL; TPLMS; Watershed model |
| Abstract |
TPLMS (Total water pollutant load management system) that is the most powerful water-quality protection program have been implemented since 2004. In the implementation of TPLMS, target water-quality and permissible discharged load from each unit watershed can be decided by water-quality modeling. And NPS (Non-point sources) discharge coefficients associated with certain (standard) flow are used on estimation of input data for model. National Institute of Environmental Research (NIER) recommend NPS discharge coefficients as 0.15 (Q275) and 0.50 (Q185) in common for whole watershed in Korea. But, uniform coefficient is difficult to reflect various NPS characteristics of individual watershed. Monthly NPS discharge coefficients were predicted and estimated using surface flow and water-quality from HSPF watershed model in this study. Those coefficients were plotted in flow duration curve of study area (Palger stream and Geumho C watershed) with monthly average flow. Linear regression analysis was performed about NPS discharge coefficients of BOD, T-N and T-P associated with flow, and R2 of regression were distributed in 0.893~0.930 (Palger stream) and 0.939~0.959 (Geumho C). NPS Discharge coefficient through regression can be estimated flexibly according to flow, and be considered characteristics of watershed with watershed model. |