Journal of Korean Society for Geospatial Information Science (대한공간정보학회지)

Korea Spatial Information Society (대한공간정보학회)
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Catchment Similarity Assessment Based on Catchment Characteristics of GIS in Geum River Catchments, Korea

금강 유역을 대상으로 한 GIS 기반의 유역의 유사성 평가

  • Lee, Hyo Sang (Department of Civil Engineering, Chungbuk National University) ;
  • Park, Ki Soon (Department of Civil Engineering, Chungbuk National University) ;
  • Jung, Sung Heuk (Department of Civil Engineering, Chungbuk National University) ;
  • Choi, Seuk Keun (Department of Civil Engineering, Chungbuk National University)
  • Received : 2013.08.06
  • Accepted : 2013.09.23
  • Published : 2013.09.30
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Abstract

Similarity measure of catchments is essential for regionalization studies, which provide in depth analysis in hydrological response and flood estimations at ungauged catchments. However, this similarity measure is often biased to the selected catchments and is not clearly explained in hydrological sense. This study applied a type of hydrological similarity distance measure-Flood Estimation Handbook to 25 Geum River catchments, Korea. Three Catchment Characteristics, Area(A)-Annual precipitation(SAAR)-SCS Curve Number(CN), are used in Euclidian distance measures. Furthermore, six index of Flow Duration Curve are applied to clustering analysis of SPSS. The catchments' grouping of hydrological similarity measures suggests three groups (H1, H2 and H3) and the four catchments are not grouped in this study. The clustering analysis of FDC provides four Groups; F1, F2, F3 and F4. The six catchments (out of seven) of H1 are grouped in F1, while Sangyeogyo is grouped in F2. The four catchments (out of six) of H2 are also grouped in F2, while Cheongju and Guryong are grouped in F1. The catchments of H3 are categorized in F1. The authors examine the results (H1, H2 and H3) of similarity measure based on catchment physical descriptors with results (F1 and F2) of clustering based on catchment hydrological response. The results of hydrological similarity measures are supported by clustering analysis of FDC. This study shows a potential of hydrological catchment similarity measures in Korea.

유역의 수문학적 유사성 평가는 계측지역의 홍수량 정보를 미계측 유역에서 활용하는 지역화 연구의 기초로서 다양하게 연구되고 있다. GIS 기반의 유역 특성인자를 기반으로 대표적인 수문학적 거리산정법을 활용하여 금강유역의 25개 소유역을 대상으로 유역 그룹화를 수행하고, 이를 유황곡선의 관련 계수(저류계수, 갈수계수, 홍수계수, 풍수계수, 유황계수, 하상계수)를 바탕으로 한 결과와 비교하여 유역 유사성 평가의 효용성을 확인하였다. 수문학적 거리산정을 위하여 영국의 FEH(Flood Estimation Handbook)에서 제안하는 유클라디안 거리법을 적용하였으며, 유황관련계수의 군집화를 위하여 SPSS프로그램을 사용하여 계층적 군집분석의 Ward법을 적용하였다. 유역 그룹화를 수행한 결과 유역특성인자를 반영한 수문학적 거리(유사성 척도)에 의한 그룹은 총 3개(H1, H2, H3)이며, 유황관련계수에 의한 그룹은 총 4개(F1, F2, F3, F4)로 분류되었다. 두 그룹들을 대응하여 비교분석한 결과 H1그룹의 7개 유역 중 6개 유역과 H3의 모든 유역이 F1그룹과 대응하였고 H2그룹의 5개 유역 중 4개 유역이 F2그룹과 대응하였으므로 본 연구의 유사성 척도에 의한 유역 그룹화가 효용성이 있음을 확인하였다.

Keywords

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