한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제45권2호
  • /
  • Pages.137-149
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  • 2012
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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식생하천의 현장자료를 이용한 조도계수 관계식 유도

Derivation of Roughness Coefficient Relationships Using Field Data in Vegetated Rivers

  • 이종석 (한밭대학교 토목공학과) ;
  • ;
  • 김재훈 (콜로라도대학교(CSU) 토목환경공학과) ;
  • 이태우 (상지엔지니어링(주))
  • Lee, Jong-Seok (Department of Civil Engineering, Hanbat National University) ;
  • Julien, Pierre Y. (Department of Civil and Environmental Engineering, Colorado State University) ;
  • Kim, Jae-Hoon (Department of Civil and Environmental Engineering, Colorado State University) ;
  • Lee, Tae-Woo (Sangji Engineering and Construction Co.)
  • 투고 : 2011.10.04
  • 심사 : 2011.12.01
  • 발행 : 2012.02.29
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초록

본 연구는 흐름 저항에 대한 분석을 위해 초본 281개, 관목 150개, 교목 308개의 현장실측 자료로 구성된 739개 식생하천을 대상으로 수행되었다. 실측자료의 Manning 조도계수 분포는 초본자료에서 0.015~0.250, 관목자료에서 0.016~0.250, 교목자료에서 0.018~0.310의 범위를 갖는다. 이들 조도계수의 중요한 분포경향은 Darcy-Weisbach (또는 Manning의 조도계수)와 유량, 마찰경사 및 상대 잠수비에 대한 관계식으로 제시하였다. 식생하천에서 Darcy-Weisbach와 Manning 조도계수에 관한 회귀 방정식은 $f_{veg}=0.436Q^{-0.363}$, $f_{veg}=3.305S_f^{0.508}$와 $n_{veg}=0.061Q^{-0.124}$, $n_{veg}=0.144S_f^{0.199}$ 및 $V=5.3(h/d_{50})^{1/8.3}{\sqrt{ghS_f}}$, $\sqrt{8/f}(=V/u_*)=5.75log(5h/d_{50})$로 유도되었다. 이들 반 경험적 관계식은 수공 실무에서 유용하게 사용될 것이다.

Field measurements of resistance to flow are analyzed for 739 rivers vegetated with grass (281 channels), shrubs (150 channels) and trees (308 channels). The measured distribution of Manning roughness coefficients ranges from 0.015~0.250 for grass, 0.016~0.250 for shrubs, 0.018~0.310 for trees. Significant trends are obtained between Darcy-Weisbach (or Manning roughness coefficients) and flow discharge, friction slope, and relative submergence. The regression equations for Darcy-Weisbach and Manning roughness coefficients in vegetated rivers are: $f_{veg}=0.436Q^{-0.363}$, $f_{veg}=3.305S_f^{0.508}$, and $n_{veg}=0.061Q^{-0.124}$, $n_{veg}=0.144S_f^{0.199}$, $V=5.3(h/d_{50})^{1/8.3}{\sqrt{ghS_f}}$, $\sqrt{8/f}(=V/u*)=5.75log(5h/d_{50})$, respectively. These semi-empirical relationships should be useful for hydraulic engineering practice.

키워드

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  1. Flow Characteristics of Lateral Irrigation Canals Diverted from Kimje Main Canal in Dongjin Irrigation Area vol.54, pp.5, 2012, https://doi.org/10.5389/KSAE.2012.54.5.113
  2. Roughness Coefficients Evaluation of the Korean Riparian Vegetation vol.32, pp.6B, 2012, https://doi.org/10.12652/Ksce.2012.32.6B.345