대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제32권2B호
  • /
  • Pages.139-147
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  • 2012
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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자연하천 현장자료를 이용한 저항계수의 결정

Determination of Resistance Coefficients Using Field Measurements in Natural Rivers

  • 이종석 (한밭대학교 토목공학과)
  • 투고 : 2011.12.07
  • 심사 : 2012.03.06
  • 발행 : 2012.04.30
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초록

본 연구는 자연하천의 모래 179개, 자갈 992개, 조약돌 651개, 호박돌 53개 수로로 구성된 현장실측 1,875개 하천자료를 사용하여 흐름 저항에 대한 Darcy-Weisbach 마찰계수와 Manning의 조도계수 및 무차원 유속의 관계식을 각각 유도하였다. 멱함수 형의 이들 관계식은 유량, 수로경사 및 상대 잠수비에 대한 함수식으로 회귀분석과 반 경험적 방법에 의해 제안하였다. Box-Whisker 분석에 의한 Manning 조도계수의 실측치 분포는 각각 모래자료에서 0.004~0.151, 자갈자료에서 0.008~0.250, 조약돌 자료에서 0.015~0.327 및 호박돌 자료에서 0.023~0.444로 나타났다. 이들 반 경험적 관계식과 저항계수는 수공분야의 정보제공에 유용하게 사용될 것이다.

This study is derived relationships of the resistance coefficients of Darcy-Weisbach and Manning for flow resistance and the dimensionless velocity using many field measurements for 1,875 rivers consist of sand 179, gravel 992, cobble 651 and boulder 53 channels in natural rivers, respectively. The relationships of power law forms are developed as a function of flow discharge, friction slope, and relative submergence by the regression and the semi-empirical method. The measurements distribution of Manning resistance coefficients by the Box-Whisker Plots show the values which ranges from 0.004~0.151 for sand, 0.008~0.250 for gravel, 0.015~0.327 for cobble, 0.023~0.444 for boulder in natural rivers, respectively. Relationships of these semi-empirical and resistance coefficients will be useful to give information in hydraulic engineering.

키워드

참고문헌

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