Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on Management Criteria of Seepage for Fill Dams Considering Rainfall Effect

강수를 고려한 필댐 침투수량의 관리기준에 관한 연구

  • Lee, Jongeun (Dept. of Civil Engrg., Gyeongsang National Univ.) ;
  • Yoon, Sukmin (Engrg. Research Institute, Gyeongsang National Univ.) ;
  • Im, Eun-Sang (Water Energy&Infrastructure Research Center, K-water) ;
  • Kang, Gichun (Dept. of Civil Engrg., Gyeongsang National Univ.)
  • 이종은 (경상대학교 토목공학과) ;
  • 윤석민 (경상대학교 공학연구원) ;
  • 임은상 (K-water 물인프라.에너지연구소) ;
  • 강기천 (경상대학교 토목공학과)
  • Received : 2020.03.20
  • Accepted : 2020.05.22
  • Published : 2020.05.31
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Abstract

The purpose of this study is to suggest the management criteria through the decision tree analysis for a seepage, which is an important instrumentation type of the fill dam. In the case of the seepage of the dam in Korea, seepage can be increased rapidly because rainfall directly flow into the downstream slope and abutment of dam during rainfalls. Therefore, it is necessary the management criteria for the seepage of the fill dam in consideration of rainfall. In this study, decision tree analysis was performed for a fill dam in Korea by setting the seepage as the response variable and the rainfall and water level of dam as explanatory variables. As the study results, the water level acted as an explanatory variable from the conditions under daily rainfall of 34.75 mm/day, and the branch conditions of the water level were analyzed to be 37.4 m and 35.23 m. 98% of the rainfall data is distributed under the conditions of the daily rainfall of 34.75 mm/day, and coverage of the seepage is indicated from 13.25 L/min to 24.24 L/min. When the rainfall and water level as the influence factors for the seepage were selected, the influence of the rainfall was dominant. Finally, the seepage of fill dam by considering the rainfall and water level was suggested as a management criteria.

본 연구의 목적은 필댐의 중요 계측항목인 침투수량계에 대해서 의사결정나무 분석을 통해 관리기준을 제시하는 것이다. 국내 댐의 침투수량의 경우는 강수시 하류사면 및 양안으로부터 강수의 직접적인 유입이 발생하여 침투수량이 급증하는 현상이 발생한다. 따라서 강수를 고려한 필댐의 관리기준이 필요한 설정이다. 본 연구에서는 국내 필댐 1개소에 대해 침투수량을 반응변수로 하고 강수량 및 저수위를 설명변수로 설정하여 의사결정나무 분석을 수행하였다. 그 결과 강수량 34.75mm/day 이하의 조건에서부터 저수위가 설명변수로서 작용하였고 저수위의 분기조건은 37.4m, 35.23m로 분석되었다. 강수량 34.75mm/day 이하의 조건에서 침투수량 자료의 98%가 분포하며, 해당 집단의 평균값은 13.25L/min~24.24L/min으로 나타났다. 침투수량에 대한 영향인자로서 강수량 및 저수위를 선택하는 경우 강수량의 영향이 지배적이었고 강수 및 저수위별 평균 침투수량의 관리기준이 제안되었다.

Keywords

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