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Derivation Method of Rating Curve and Relationships for Flow Discharge-Total Sediment at Small-Midium Streams in Agrarian Basin

농경유역 중소하천에서 유량과 총유사량의 관계식 유도방법

  • 이종석 (한밭대학교 건설환경공학과) ;
  • 김치곤 (한밭대학교 대학원 토목공학과) ;
  • 유의근 (한밭대학교 대학원 토목공학과)
  • Received : 2015.07.10
  • Accepted : 2015.08.07
  • Published : 2015.08.28

Abstract

This study aims to derivate of the relationship and rating curve for the flow discharge-total sediment using the measured field data from the main points of small-medium stream reaches in agrarian basin. The total sediment of measured data are obtained by bed load added to suspended load which analyzed using the particle size distribution curve of sieve test and the dry or the filtration method from the collected samples by samplers (DH-48, D-74 and BLH-84, BL-84) at the stream bed and the depth-averaged concentration, respectively. These field data had been collected from August 2012 to September 2014 at the seven measuring stations of the national-local channel reaches of the four study streams in the Nonsan river systems of agrarian basin. As a result, the relationships and the rating curve for the flow discharge-total sediment are derived as a function pattern of power law by analyzing on a distribution characteristic of the database set and it will be used as a useful tool to analyze erosion, deposition, and transportation in theoretical research as well as in practical application of the hydraulic sedimentation engineering.

본 연구는 농경유역 중소하천의 주요 지점에서 실측된 현장자료를 사용하여 유량과 총유사량 관계곡선과 이들 간의 관계식을 유도한다. 실측치 총유사량 자료는 수심평균농도와 하상에서 각각의 부유사와 소류사 채취기(DH-48, D-74 및 BLH-84, BL-84)에 의해 채집된 시료를 건조 또는 여과법, 체분석에 의한 입도분포곡선을 통해 얻은 부유사량에 소류사량을 합하여 얻었다. 이들 현장자료는 농경유역 논산수계 내 4개 대상하천의 국가-지방하천 수로구간 7개 측점에서 2012년 8월부터 2014년 9월까지 측정되었다. 그 결과, 유량과 총유사량에 대한 관계곡선과 관계식은 현장측정 자료군의 분포특성을 분석함으로써 멱함수형으로 유도하였으며, 이들 관계식은 수공 유사공학의 이론적 연구뿐만 아니라 실무적 응용에 있어 세굴, 퇴적 및 이송을 해석하는데 유용한 도구로 사용될 수 있을 것이다.

Keywords

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