植被条件下河相关系研究

Research on Hydraulic Geometry with Vegetation

由于植物的影响,植被条件下河相关系变得更加复杂。在窦国仁提出的最小活动性假说的基础上,根据水流连续方程、水流阻力方程和Meyer-Peter输沙率公式,同时考虑植被对边坡糙率、边坡稳定系数、泥沙输移强度等方面的影响,提出了植被和非植被条件下推移质河床的河相关系。为了验证该河相关系,进行了植被条件和非植被条件下的河道几何形态变形试验。通过试验数据与计算结果的比较及植被条件和非植被条件下的河相关系差异的比较,验证了所建立的河相关系。

Due to the effect of vegetation,hydraulic geometry relationship becomes complex. Based on the minimum active hypothesis proposed by Dou Guoren,continuity equation,momentum equation of flow with Meyer-Peter bedload formula,the hydraulic geometry formula for the channel with vegetation was proposed with the consideration of the effect of vegetation on the slope roughness,stability factor of slop and the intensity of sediment transport. Then using the sanded glass flume to simulate shifting bed straight channel,a series of data on hydraulic geometry with rigid vegetation and no vegetation were obtained. The comparison of the calculated data with the experiments and the difference between the hydraulic geometry with vegetation and that without vegetation,showed that the present formula is capable of well modeling the hydraulic geometry.