The Developmet and Application of GIS-Based Geomorpho-Hydrological Watershed Model (G2WMS)

Kim, Hong-Tae; Shin, Hyun-Suk

Journal of the Korean Society of Hazard Mitigation 2009;9(1):123-134.
Published online February 28, 2009.

GIS기반 지형수문유역모의 모형의 개발 및 적용 연구

김홍태, 신현석

The Developmet and Application of GIS-Based Geomorpho-Hydrological Watershed Model (G2WMS)

Hong-Tae Kim, Hyun-Suk Shin

Abstract

In this study, we developed the GIS-based Geomorpho-hydrological Watershed Modeling System($G^{2}WMS$) which could consider both nonlilear rainfall-runoff relationship based on Geomorpho-Climatic Unit Hydrograph(GCUH) as well as watershed system inducing river routing. The developed new model was calibrated at the gaged rainfall events at natural watersheds and previewed to apply at the ungaged mountain basins, such as Sulma basin for small mountain basin and Andong-Dam basin for large scale basin, compared single with partitioned basin in the observed unit hydrographs and rainfall-discharge events. Finally, at the large scale Andong dam basin, we concluded that partitioned basin cases which including th nonlinear GCUH and river routing methods were superior to single basins which including the traditional methods in rainfall-discharge simulation at the mountain basins.

Key Words: Geomorpho-Climatic Unit Hydrograph(GCUH); ungaged basins; gaged rainfall events; GIS-based Geomorphohydrological Watershed Modeling System($G^{2}WMS$)

요지

본 연구는 비선형 단위도인 지형형태-기후학적 단위도(GCUH)와 하도추적을 포함한 GIS기반 지형수문유역모의 모형 ($G^{2}WMS$)을 개발하고 실강우사상과 계측 산악유역에 적용함으로써 미계측 산악유역의 적용가능성을 검토하는 것이다. 대상유역을 소유역은 설마천, 중유역은 안동댐 유역으로 선정하여 실측단위도 비교, 실측홍수사상 비교를 단일유역과 분할유역으로 구분하여 검정 및 분석에 이용하였다. 결과적으로, 중유역 안동댐은 비선형 GCUH기법과 하도추적이 적용된 분할유역이 선형 전통적기법만 적용된 단일유역보다 산악유역 강우-유출 특성을 잘 반영함을 확인하였다.

핵심용어: 지형형태-기후학적 단위도; 미계측 산악유역; 실측홍수사상; GIS기반 지형수문유역모의 모형