不同糙率坡面水力学特征的试验研究

在室内试验的基础上,采用定床阻力试验研究了坡面流水力学参数(雷诺数、佛汝德数、阻力系数和流速)随床面糙率、流量和坡度的变化规律。初步得出以下结论:(1)在床面和流量相同条件下,坡面流雷诺数和佛汝德数均随坡度的增加而增大。(2)在坡度和流量相同情况下,随着坡面粗糙度增加,坡面流雷诺数和佛汝德数均呈减小趋势;同时水流流速减小,阻力系数增大,这说明水流克服阻力做功所消耗的能量也增加。

Experimental Study of Overland Flow Hydromechanics Under Different Degrees of Roughness

The relationships for hydro-dynamic parameters(Reynolds number,Froude number,resistance coefficient and flow velocity)of overland flow as a function of bed roughness,flow discharge and slope gradient were simulated by means of indoor fixed-bed resistance experiments.The preliminary result indicates that Reynolds number and Froude number of overland flow tend to increase as slope gradient increases in the condition of same bed surface and flow discharge.Reynolds Number and Froude number of overland flow tend to diminish,water flow velocity tends to diminish,and resistance coefficient tends to increases as bed surface roughness increases in the condition of same slope gradient and flow discharge.It shows that consumed energy for working of water flow against resistance tends to increase.