Regionalization of CN Parameters for Nakdong River Basin using SCE-UA Algorithm

SCE-UA 최적화기법에 의한 낙동강 유역의 CN값 도출

  • Jeon, Ji-Hong (Department of Environmental Engineering, Andong National University) ;
  • Choi, Dong Hyuk (Department of Environmental Engineering, Andong National University) ;
  • Kim, Jung-Jin (Department of Environmental Engineering, Andong National University) ;
  • Kim, Tae Dong (Department of Environmental Engineering, Andong National University)
  • Received : 2008.12.19
  • Accepted : 2009.01.24
  • Published : 2009.03.30

Abstract

CN values are changed by various surface condition, which is cover type or treatment, hydrologic condition, or percent impervious area, even the same combination of land use and hydrologic soil group. In this study, CN parameters were regionalized for Nakdong River Basin by Long-Term Hydrologic Impact Assessment (L-THIA) coupled with SCE-UA, which is one of the global optimization technique. Six watersheds were selected for calibration (optimization) and periodic validation and two watersheds for spatical validation as ungauged watershed within Nakdong River Basin. Nash-Sutcliffe (NS) values were 0.66~0.86 for calibration, 0.68~0.91 for validation, and 0.60 and 0.85 for ungauged watersheds, respectively. Urban area for the selected watersheds covered high impervious area with 85% for residential area and 92% for commercial/industrial/transportation area. Hydrologic characteristics for crop area was similar to row crop with contoured treatment and poor hydrologic condition. For the forested area, hydrologic characteristics could be clearly distinguished from the leaf types of plant. Deciduous, coniferous, and mixed forest showed low, moderate, and high runoff rates by representing wood with fair and poor hydrologic condition, and wood-grass combination with fair hydrologic condition, respectively. CN parameters from this study could be strongly recommended to be used to simulate runoff for ungauged watershed.

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