Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Sediment discharge assessment and stable channel analysis using Model Tree of data mining for Naesung Stream

데이터 마이닝의 Model Tree를 활용한 내성천의 유사량 산정 및 안정하도 평가

  • Jang, Eun-Kyung (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Ji, Un (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Ahn, Myeonghui (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
  • 장은경 (한국건설기술연구원 국토보전연구본부) ;
  • 지운 (한국건설기술연구원 국토보전연구본부) ;
  • 안명희 (한국건설기술연구원 국토보전연구본부)
  • Received : 2018.08.01
  • Accepted : 2018.09.13
  • Published : 2018.11.30
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Abstract

A Model Tree technique of data mining was applied to derive optimal equations for sediment discharge assessment based on the measured sediment data and then to evaluate stable channel design for Naesung Stream. The sediment discharge formula as a function of channel width, velocity, depth, slope and median grain diameter which was developed by a Model Tree technique with sediment discharge data measured in Korean River had a high goodness-of-fit between measured and calculated results. In case of the sediment discharge formula as a function of channel width, velocity, depth and median grain diameter which was developed by a Model Tree technique with sediment discharge data only measured in Naesung Stream represented the highest goodness-of-fit. Two types of sediment discharge formulas were applied to evaluate stable channel analysis for Yonghyeol Station of Naesung Stream. As a result, bed erosion was expected in the study section compared to the current section. It was also presented that the be slope might be changed to be a milder slope than the current slope to reach equilibrium condition in the long term.

본 연구에서는 국내 하천에서 실측한 유사량 자료를 기초로 데이터 마이닝의 Model Tree 기법을 통해 유사량 산정 공식들을 도출하였으며, 이를 활용하여 내성천에서의 안정하도 단면을 평가하였다. 본 연구에서 도출한 유사량 공식은 국내 모래하상 전체를 대상으로 한 경우, 하폭, 유속, 수심, 경사, 하상토 중앙입경을 선택하였을때 적합도가 가장 높은 것으로 나타났다. 또한 내성천으로 자료의 범위를 한정한 경우에는 경사를 제외한 하폭, 유속, 수심, 하상토 중앙입경을 선택한 유사량 공식의 적합도가 가장 높게 나타났다. 각각의 Model Tree 공식들은 내성천 영주댐 하류 용혈지점에서의 안정하도 단면 평가를 수행하는데 적용되었으며, 현재 내성천의 단면과 비교했을 때 향후 안정하도 단면으로의 변화를 위해 하상의 침식이 발생할 것으로 예측되었다. 또한 현재 하상보다 완만한 경사가 유지될 경우 장기적으로 평형상태에 도달할 것으로 예측되었다.

Keywords

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