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2018 Vol.51, Issue 3
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

Eun-Kyung Janga
,
Myeonghui Ahnb
,
Un Jib,c*
장 은경a
,
안 명희b
,
지 운b,c*
aDepartment of Civil and Environmental Engineering, Colorado State University
bHydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology
Department of Smart City and Construction Engineering, University of Science and Technology
a콜로라도 주립 대학교 토목환경공학과
b한국건설기술연구원 수자원․하천연구소
과학기술연합대학원대학교 스마트시티․건설공학
*교신저자. *Corresponding Author. 
31 March 2018. pp. 183-193
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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 260 m3/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.

Keywords
Bankfull discharge
Channel-forming discharge
Naesung stream
Sediment transport equation
Stable channel design

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 260 m3/s을 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.

키워드
만제유량
하도형성유량
내성천
유사이송공식
안정하도설계
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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 : 51
  • No :3
  • Pages :183-193
  • Received Date : 2017-07-04
  • Revised Date : 2017-10-26
  • Accepted Date : 2017-12-07
  • DOI :https://doi.org/10.3741/JKWRA.2018.51.3.183
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