Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Channel-forming discharge calculation and stable channel section evaluation for downstream reach of Yeongju dam in Naesung stream

내성천의 영주댐 하류 구간의 하도형성유량 산정 및 안정하도 단면 평가

  • Jang, Eun-Kyung (Department of Civil and Environmental Engineering, Colorado State University) ;
  • Ahn, Myeonghui (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Ji, Un (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 장은경 (콜로라도 주립 대학교 토목환경공학과) ;
  • 안명희 (한국건설기술연구원 수자원.하천연구소) ;
  • 지운 (한국건설기술연구원 수자원.하천연구소)
  • Received : 2017.07.04
  • Accepted : 2017.12.07
  • Published : 2018.03.31
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Abstract

Channel-forming discharge for downstream section of Yeongju dam in Naesung stream was calculated to analyze stable channel geometry. Determined channel-forming discharge was applied to design stable channel slope, depth, and base width at Yonghyeol station. Used data for channel-forming discharge and stable channel analysis were collected in downstream section of Yeongju dam in Naesung stream before the dam construction. Specified recurrence interval discharge, effective discharge, and bankfull discharge were analyzed and compared to decide final channel-forming discharge which was $260m^3/s$ of bankfull discharge. Stable channel analysis and design program was applied to predict stable channel section of width, depth, and slope with various sediment transport equations of Ackers and White, Brownlie, Engelund and Hansen, and Yang's equations. As a result, all equations of sediment transport produced milder slopes compared to current bed slope of 0.00177 and Ackers and White equation presented the most similar flow depth of current section with the design constraint of current channel width.

본 연구에서는 내성천의 영주댐 하류 구간에서의 안정하도 단면 평가를 수행하기 위해 하도형성유량을 산정하였으며 이를 기준으로 용혈지점에서의 안정하도 경사, 수심, 하폭에 대한 평가를 수행하였다. 하도형성유량과 안정하도 평가를 수행하기 위해 사용된 자료는 용혈지점에서 영주댐 건설 전에 수집된 자료이다. 특정 재현기간별 유량, 유효유량, 만제유량을 산정하여 비교 검토를 통해 최종적으로 만제유량인 $260m^3/s$을 하도형성유량으로 채택하였다. 또한 안정하도 설계 프로그램(SCAD)을 활용하여 Ackers and White, Brownlie, Engelund and Hansen, Yang 공식을 각각 적용하여 대상단면의 안정하도를 평가하였다. 그 결과, 모든 유사이송공식이 현재 하도의 하상경사인 0.00177보다 완만한 경사를 제시하는 것으로 나타났으며 하도의 바닥 폭을 설계구속인자로 고려할 경우 Ackers and White 공식을 적용하여 안정하도를 계산했을 때 안정하도의 수심이 현재 단면의 수심과 가장 근접한 것을 알 수 있었다.

Keywords

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