Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Yongdam Dam Watershed Flood Simulation Using GPM Satellite Data and KIMSTORM2 Distributed Storm Runoff Model

GPM위성 강우자료와 KIMSTORM2 분포형 유출모형을 이용한 용담댐 유역 홍수모의

  • KIM, Se-Hoon (Dept. of Civil, Environmental and Plant Engineering, Konkuk University) ;
  • KIM, Jin-Uk (Dept. of Civil, Environmental and Plant Engineering, Konkuk University) ;
  • CHUNG, Jee-Hun (Dept. of Civil, Environmental and Plant Engineering, Konkuk University) ;
  • KIM, Seong-Joon (School of Civil and Environmental Engineering, Konkuk University)
  • 김세훈 (건국대학교 사회환경플랜트공학과) ;
  • 김진욱 (건국대학교 사회환경플랜트공학과) ;
  • 정지훈 (건국대학교 사회환경플랜트공학과) ;
  • 김성준 (건국대학교 사회환경공학부)
  • Received : 2019.11.18
  • Accepted : 2019.12.12
  • Published : 2019.12.31
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Abstract

This study performed the dam watershed storm runoff modeling using GPM(Global Precipitation Measurement) satellite rain and KIMSTORM2(KIneMatic wave STOrm Runoff Model 2) distributed model. For YongdamDam watershed(930㎢), three heavy rain events of 25th August 2014, 11th September 2017, and 26th June 2018 were selected and tested for 4 cases of spatial rainfalls such as (a) Kriging interpolated data using ground observed data at 7 stations, (b) original GPM data, (c) GPM corrected by CM(Conditional Merging), and GPM corrected by GDA(Geographical Differential Analysis). For the 4 kinds of data(Kriging, GPM, CM-GPM, and GDA-GPM), the KIMSTORM2 was calibrated respectively using the observed flood discharges at 3 water level gauge stations(Cheoncheon, Donghyang, and Yongdam) with parameters of initial soil moisture contents, stream Manning's roughness coefficient, and effective hydraulic conductivity. The total average Nash-Sutcliffe efficiency(NSE) for the 3 events and 3 stations was 0.94, 0.90, 0.94, and 0.94, determination coefficient(R2) was 0.96, 0.92, 0.97 and 0.96, the volume conservation index(VCI) was 1.03, 1.01, 1.03 and 1.02 for Kriging, GPM, CM-GPM, and GDA-GPM applications respectively. The CM-GPM and GDA-GPM showed better results than the original GPM application for peak runoff and runoff volume simulations, and they improved NSE, R2, and VCI results.

본 연구에서는 GPM 위성자료 및 분포형 강우-유출 모형 KIMSTORM2(KIneMatic wave STOrm Runoff Model2)을 이용하여 용담댐 유역(930㎢)을 대상으로 유출모의를 수행하였다. 모형의 유출해석은 2014년 08월 25일 05:00~17:00, 2017년 09월 11일 01:00~12:00, 2018년 06월 26일 23:00~06월 27일 10:00 총 3개의 집중호우 기간으로, 4가지 공간자료: (a) 7개의 지상관측소 강우를 Kriging 기법으로 공간내삽한 자료, (b) 원 GPM 자료, (c) 조건부합성(Conditional Merging, CM)으로 보정한 GPM(CM-GPM) 자료, (d) 지리적편차(Geographical Differential Analysis, GDA)로 보정한 GPM(GDA-GPM) 자료를 각각 준비하였다. 유출 보정은 유역내 3개의 수위관측지점(천천, 동향, 용담댐)을 대상으로 실시하였으며, 4가지 공간자료에 대하여 모형의 매개변수인 초기 토양수분량, 하천 Manning 조도계수, 유효투수계수를 각각 보정하였다. 보정결과는 결정계수(Determination coefficient, R2), Nash-Sutcliffe의 모형효율계수(NSE) 및 유출용적지수(Volume Conservation Index, VCI)를 산정하였다. 그 결과, 3개의 강우에 대한 Kriging, GPM, CM-GPM 및 GDA-GPM의 평균 NSE는 0.94, 0.90, 0.94, 0.94, R2는 0.96, 0.92, 0.97, 0.96, VCI는 1.03, 1.01, 1.03, 1.02로 보정되었다. R2, NSE 및 VCI에 있어, CM-GPM과 GDA-GPM이 원 GPM보다 첨두유출량 및 유출용적에 있어 보다 잘 보정되었다.

Keywords

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