| Title |
Application of the Load Duration Curve (LDC) to Evaluate the Rate of Achievement of Target Water Quality in the Youngsan,Tamjin River Watersheds |
| Authors |
정은정 ( Eunjeong Cheong ) ; 김홍태 ( Hongtae Kim ) ; 김용석 ( Yongseok Kim ) ; 신동석 ( Dongseok Shin ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.4.349 |
| Keywords |
LDC (Load Duration Curve); TWQ (Target Water Quality); TMDLs (Total Maximum Daily Loads); Youngsan;Tamjin River |
| Abstract |
Total Maximum Daily Loads (TMDLs) System has been used to improve water quality in the YoungsanㆍTamjin river basin since 2004. The Basic Policy of TMDLs sets up the standard flow based on the average dry condition or mid-range flow during the last 10 years. However, Target Water Quality (TWQ) assessment on TMDLs has been used to evaluate water quality through eight-day intervals over 36 times a year. The results for allocation evaluation and target water quality evaluation were different from each other in the same unit watershed during the first period. In order to improve the evaluation method, researchers applied Load Duration Curve (LDC) to evaluate water quality in nine unit watersheds of the Youngsan·Tamjin river basin. The results showed that achievement rates of TWQ assessment with the current method and LDC were 67~100% and 78~100%, respectively. Approximately 11% of the achievement rates with use of LDC were higher than those with use of the current method. In conclusion, it is necessary to review the application of the LDC method in all Four Major River Watersheds. |