沙棘植物柔性坝糙率系数的野外水流试验

Roughness Coefficient of Seabuckthorn Plant Flexible Dam Under Field Water-flow Experiment

为了研究沙棘植物柔性坝的糙率系数,在陕西省华县小华山水库沙棘植物柔性坝进行了沙棘植物柔性坝野外水流试验。运用河流泥沙动力学理论推导了沙棘植物柔性坝的糙率估计公式,并对一定生长期非淹没流的沙棘植物柔性坝的糙率系数进行了估算。结果表明,沙棘柔性坝的糙率范围大致介于0.04-0.09的范围内;并基于野外水流试验数据,按照河流动力学方法对沙棘植物柔性坝的糙率系数进行了反推计算,所得结果与用理论公式估计的结果比较吻合,表明沙棘植物柔性坝糙率理论估计公式可用于对沙棘植物柔性坝的糙率估计,这对于进一步深入研究沙棘植物柔性坝的拦沙效应与机理具有重要意义。

In order to analyze the roughness coefficient of the seabuckthorn plant flexible dam,a field water flow test on the seabuckthorn plant flexible dam was conducted in the seabuckthorn plant flexible dam test base in Xiao-hua-shan Reservoir,Huaxian County,Shaanxi Province.The estimation formula of the seabuckthorn plant flexible dam＇s roughness coefficient was derived by the river sediment dynamics theory,and the roughness coefficients of the seabuckthorn plant flexible dam were evaluated by the formula under non-submerged flow during some growth stage.The results indicated that the seabuckthorn flexible dam＇s roughness coefficient was approximately within the range of 0.04-0.09.The roughness coefficient of the seabuckthorn plant flexible dam was inversely deduced and calculated from the field flow test data by the river dynamics method,and it was found that the result was in accord with that calculated by the theory evaluation formula.It was suggested that the theoretic estimation formula could be used to evaluate the roughness coefficient of the seabuckthorn plant flexible dam,and it was of great value to further study the effects and mechanism of the seabuckthorn plant flexible dam on sediment retention.