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利用水槽试验研究了无草、淹没型、非淹没型柔性植物水流阻力特性的变化规律,分析了含植物明渠沿程水面比降和阻力系数的变化特性。得到各植物阻力系数变化与尼库拉兹曲线基本相似,紊流范围内同样可划分为紊流光滑区、紊流过渡区、紊流粗糙区;探讨了各植物明渠等效河床的问题,据此确定了各植物的粗糙度,对植物粗糙度、水流雷诺数和阻力系数之间的关系进行了分析,并通过对各植物水流阻力系数的分区回归计算,得到各植物水流阻力的分区经验表达式,该方法能较好地应用于含植物明渠水流阻力系数的推求。
The variation of water flow resistance characteristics of grass-less, submerged and non-submerged flexible plants was studied by using a sink test, and the variation characteristics of water surface drag and drag coefficient along the open channel containing the plant were analyzed. Obtained the plant drag coefficient changes and the Nikuras curve is basically similar to the turbulence can be divided into turbulent smooth area, turbulent transition zone, turbulence rough area; discusses the open channel equivalent river bed problems, according to The relationship between plant roughness, Reynolds number and drag coefficient was analyzed and the partitioned expression of drag coefficient of each plant was calculated to obtain the empirical expression of flow resistance of each plant This method can be applied to the calculation of flow resistance coefficient of open channel with plant.