| Title |
Application of the Load Duration Curve (LDC) to Evaluate the Achievement Rate of Target Water Quality in the Han-River Watersheds |
| Authors |
김은경 ( Eunkyoung Kim ) ; 류지철 ( Jichul Ryu ) ; 김홍태 ( Hongtae Kim ) ; 김용석 ( Yongseok Kim ) ; 신동석 ( Dongseok Shin ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.6.732 |
| Keywords |
Han-River; LDC; Load Duration Curve; Target Water Quality; TMDLs; Total Maximum Daily Loads |
| Abstract |
Water quality in four major river basin in Korea was managed with Total Maximum Daily Load (TMDL) System. The unit watershed in TMDL system has been evaluated with Target Water Quality (TWQ) assessment using average water quality, without considering its volume of water quantity. As results, although unit watershed are obtained its TWQ, its allocated loads were not satisfied and vice versa. To solve these problems, a number of TWQ assessments with using Load Duration Curve (LDC) have been studied at other watersheds. The purpose of this study was to evaluate achievement of TWQ with Flow Duration Curve (FDC) and Load Duration Curve(LDC) at 26 unit watersheds in Han river basin. The results showed that achievement rates in TWQ assessment with current method and with LDC were 50~56 % and 69~73%, respectively. Because of increasing about 20% of achievement rates with using LDC, the number of exceeded unit watershed at Han river Basin was decreased about 4~6 unit watersheds. |