三维土工网护坡坡面流水动力学特性试验研究

The experimental research on hydrodynamic characteristics of the overland flow on the slope with three dimensional Geomat

采用室内变坡水槽,通过组合不同坡度(5o、10o、15o、20o、25o和30o)、不同流量(1 m3/h、1.5 m3/h和2 m3/h)室内模拟放水冲刷试验,对三维土工网护坡坡面流水动力学特性进行了研究。结果表明,坡面流流态为紊流,流型为急流;坡面冲刷深度—坡度、阻力系数—坡度及阻力系数—雷诺数呈正相关的幂函数关系;阻力系数—弗汝德数呈负相关的幂函数关系。研究成果对深入揭示三维土工网护坡坡面侵蚀的水动力过程具有重要的理论意义。

The hydrodynamic characteristics of the overland flow on the slope with the three dimensional Geomat were studied by using indoor variable slope flume and runoff scouring experiments under the different slope gradients （5°、10°、15°、20°、25°and30°） and the different flow discharges （1 m3/h, 1.5 m3/h and 2 m3/h）. The results show that when flow condition of slope flow is turbulent and the flow pattern is the rapids, the relationships between scour depth and slope, resistance coefficient and slope gradient, drag coefficient and Reynolds number are positively related power functions, but the relationship between drag coefficient and Froude number is inversely related power function. This research has important theoretical significance for the further study of the hydrodynamic process of erosion on the slope surface with the Three dimensional Geomat.