본 연구는 Manning 조도계수의 실무활용을 위해 자연하천 1,875개와 식생하천 739개를 합한 2,614개 현장실측자료를 사용해 회귀 분석에 의하여 관계식을 결정하였다. Box-Wishker 분석에 의한 현장자료의 Manning 조도계수 분포는 자연하천의 179개 모래 자료에서 0.004~0.151, 992개 자갈 자료에서 0.008~0.250, 651개 조약돌 자료에서 0.015~0.327, 53개 호박돌 자료에서 0.023~0.444로 나타났고, 식생하천의 281개 초본 자료에서 0.015~0.250, 150개 관목 자료에서 0.016~0.250, 308개 교목 자료에서 0.018~0.310으로 각각 나타났다. 중요한 경향은 조도계수와 유량, 마찰경사 및 상대 잠수비 간의 관계로부터 얻었다. 자연하천과 식생하천에 대한 Manning의 조도계수 관계식은 유량과 마찰경사를 함수로 하는 멱함수 형으로 유도되었고, 무차원 전단속도 관계식은 상대 잠수비 관계로부터 얻었다. 현장실측 Manning 조도계수의 분포와 이들 관계식은 수공 실무에 유용하게 사용될 수 있을 것이다.
본 연구는 Manning 조도계수의 실무활용을 위해 자연하천 1,875개와 식생하천 739개를 합한 2,614개 현장실측자료를 사용해 회귀 분석에 의하여 관계식을 결정하였다. Box-Wishker 분석에 의한 현장자료의 Manning 조도계수 분포는 자연하천의 179개 모래 자료에서 0.004~0.151, 992개 자갈 자료에서 0.008~0.250, 651개 조약돌 자료에서 0.015~0.327, 53개 호박돌 자료에서 0.023~0.444로 나타났고, 식생하천의 281개 초본 자료에서 0.015~0.250, 150개 관목 자료에서 0.016~0.250, 308개 교목 자료에서 0.018~0.310으로 각각 나타났다. 중요한 경향은 조도계수와 유량, 마찰경사 및 상대 잠수비 간의 관계로부터 얻었다. 자연하천과 식생하천에 대한 Manning의 조도계수 관계식은 유량과 마찰경사를 함수로 하는 멱함수 형으로 유도되었고, 무차원 전단속도 관계식은 상대 잠수비 관계로부터 얻었다. 현장실측 Manning 조도계수의 분포와 이들 관계식은 수공 실무에 유용하게 사용될 수 있을 것이다.
This study is determined to use with the hydraulic engineering field of relationships for Manning roughness coefficient by the regression analyzing the field measurements of flow resistance data which consist of the total 2,614 rivers for 1,875 and for 793 data in natural and vegetated rivers. The m...
This study is determined to use with the hydraulic engineering field of relationships for Manning roughness coefficient by the regression analyzing the field measurements of flow resistance data which consist of the total 2,614 rivers for 1,875 and for 793 data in natural and vegetated rivers. The measured distribution of Manning roughness coefficients by the Box-Whisker Plots show the values which ranges from 0.004~0.151 for 179 sand, 0.008~0.250 for 992 gravel, 0.015~0.327 for 651 cobble, 0.023~0.444 for 53 boulder in natural rivers, and also from 0.015~0.250 for 281 grass, 0.016~0.250 for 150 shrubs, 0.018~0.310 for 308 trees in vegetated rivers, respectively. Significant trends are obtained between Manning roughness coefficients and flow discharge, friction slope and relative submergence. The regression equations for Manning roughness coefficients derived as the power law form with a function of the flow discharge and the friction slope, and the equations for dimensionless shear velocity developed as a relation of the relative submergence in natural and vegetated rivers. Relationships of these semi-empirical and Manning roughness coefficients in field measurements can be useful for hydraulic engineering practice.
This study is determined to use with the hydraulic engineering field of relationships for Manning roughness coefficient by the regression analyzing the field measurements of flow resistance data which consist of the total 2,614 rivers for 1,875 and for 793 data in natural and vegetated rivers. The measured distribution of Manning roughness coefficients by the Box-Whisker Plots show the values which ranges from 0.004~0.151 for 179 sand, 0.008~0.250 for 992 gravel, 0.015~0.327 for 651 cobble, 0.023~0.444 for 53 boulder in natural rivers, and also from 0.015~0.250 for 281 grass, 0.016~0.250 for 150 shrubs, 0.018~0.310 for 308 trees in vegetated rivers, respectively. Significant trends are obtained between Manning roughness coefficients and flow discharge, friction slope and relative submergence. The regression equations for Manning roughness coefficients derived as the power law form with a function of the flow discharge and the friction slope, and the equations for dimensionless shear velocity developed as a relation of the relative submergence in natural and vegetated rivers. Relationships of these semi-empirical and Manning roughness coefficients in field measurements can be useful for hydraulic engineering practice.
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