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Analysis of the Difference of Flow Duration Curve according to the Cumulative Variation of the Daily Average Flow in Unit Watershed for TPLCs

총량관리 단위유역 일평균유량의 시계열 누적 변화에 따른 유량지속곡선 차이 분석

  • Hwang, Ha-sun (Water Environmental Research Department, National Institute of Environmental Research) ;
  • Rhee, Han-pil (ETWATERS Inc.) ;
  • Seo, Ji-yeon (Water Environmental Research Department, National Institute of Environmental Research) ;
  • Choi, Yu-jin (Water Environmental Research Department, National Institute of Environmental Research) ;
  • Park, Ji- hyung (Water Environmental Research Department, National Institute of Environmental Research) ;
  • Shin, Dong-seok (Water Environmental Research Department, National Institute of Environmental Research) ;
  • Lee, Sung-jun (Water Environmental Research Department, National Institute of Environmental Research)
  • Received : 2018.09.04
  • Accepted : 2018.10.11
  • Published : 2018.11.30

Abstract

The LDC (Load Duration Curve) method can analyze river water quality changes according to flow rate and seasonal conditions. It is also possible to visually recognize whether the target water quality is exceeded or the size of the reduction load. For this reason, it is used for the optimal reduction of TPLCs and analysis of the cause of water pollution. At this time, the flow duration curve should be representative of the water body hydrologic curve, but if not, the uncertainty of the interpretation becomes big because the damaged flow condition is changed. The purpose of this study is to estimate the daily mean flow of the unit watershed using the HSPF model and to analyze the difference of the flow duration curves according to the cumulative daily mean flow rate using the NSE technique. The results show that it is desirable to construct the flow duration curve by using the daily average flow rate of at least 5 years although there is a difference by unit watershed. However, this is the result of the water bodies at the end of Han River basin watershed, so further study on various water bodies will be necessary in the future.

Keywords

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