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2024 Vol.57, Issue 4 Preview Page

Research Article

Simulation of dam inflow using a square grid and physically based distributed model

격자 기반의 물리적 분포형 모형을 이용한 댐 유입량 모의

Yun Seok Choia
,
Si Jung Choib*
최 윤석a
,
최 시중b*
aResearch Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
bSenior Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
a한국건설기술연구원 수자원하천연구본부 연구위원
b한국건설기술연구원 수자원하천연구본부 수석연구원
*Corresponding Author
30 April 2024. pp. 289-300
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Abstract

The purpose of this study is to evaluate the applicability of the GRM (Grid based rainfall-Runoff Model) to the continuous simulation by simulating the dam inflow. The GRM was previously developed for the simulation of rainfall-runoff events but has recently been improved to enable continuous simulation. The target watersheds are Chungju dam, Andong dam, Yongdam dam, and Sumjingang dam basins, and runoff models were constructed with the spatial resolution of 500 m × 500 m. The simulation period is 21 years (2001 to 2021). The simulation results were evaluated over the 17 year period (2005 to 2021), and were divided into three data periods: total duration, wet season (June to September), and dry season (October to May), and compared with the observed daily inflow of each dam. Nash-Sutcliffe efficiency (NSE), Kling-Gupta efficiency (KGE), correlation coefficient (CC), and total volume error (VE) were used to evaluate the fitness of the simulation results. As a result of evaluating the simulated dam inflow, the observed data could be well reproduced in the total duration and wet season, and the dry season also showed good simulation results considering the uncertainty of low-flow data. As a result of the study, it was found that the continuous simulation technique of the GRM model was properly implemented and the model was sufficiently applicable to the simulation of dam inflow in this study.

Keywords
Continuous simulation
Rainfall-runoff model
GRM
fitness assessment

본 연구의 목적은 물리적 분포형 유출 모형인 GRM (Grid based rainfall-Runoff Model)을 이용하여 댐 유입량을 모의함으로써 연속형 모의에 대한 GRM 모형의 적용성을 평가하는 것이다. GRM 모형은 기존에 강우-유출 사상의 모의를 위해서 개발되었으나, 최근에 연속형 모의가 가능하도록 개선되었다. 대상 유역은 충주댐 유역, 안동댐 유역, 용담댐 유역, 섬진강댐 유역이며, 500 m × 500 m의 공간 해상도로 유출 모형을 구축하였다. 모의 기간은 21년(2001년~2021년)이다. 모의결과의 평가는 17년 기간(2005년~2021년)에 대해서 수행하였으며, 17년 전체 자료(total duration), 풍수기(6월~9월, wet season), 갈수기(10월~5월, dry season)의 3개 자료 기간으로 구분하고, 각 댐의 관측된 일유입량과 비교하였다. 모의결과의 적합도 평가는 Nash-Sutcliffe efficiency 계수(NSE), Kling-Gupta efficiency 계수(KGE), 상관계수(CC), 총용적 오차(VE)를 사용하였다. 모의된 댐 유입량의 평가결과 total duration과 wet season에서 관측자료를 잘 재현할 수 있었으며, dry season에서도 저유량 자료의 불확실성을 고려할 때 양호한 모의결과를 나타내었다. 연구결과 GRM 모형의 연속형 모의기법은 적절히 구현된 것으로 판단되었으며, 본 연구의 댐 유입량 모의에 충분히 적용성이 있는 것으로 나타났다.

키워드
연속형 모의
강우-유출 모형
GRM
적합도 평가
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 57
  • No :4
  • Pages :289-300
  • Received Date : 2024-03-27
  • Revised Date : 2024-04-12
  • Accepted Date : 2024-04-12
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.4.289
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