坡面产流产沙过程对植被过滤带响应的试验研究

发布时间：2018-05-20 08:08

本文选题：植被过滤带 + 径流拦截率　；参考：《水土保持学报》2017年06期

【摘要】：为探讨植被过滤带在坡面产流产沙过程中对水沙的拦截效果及其水动力学机理,通过在室内土槽上设置模拟植被过滤带并进行浑水冲刷试验,得到有无模拟植被过滤带情况下的产流产沙情况及相关水动力学参数,定量分析了植被过滤带对径流、泥沙的拦截效果并探讨了坡面产沙率与水动力学参数之间的关系。结果表明,植被过滤带在放水冲刷试验中能有效拦截径流和泥沙,且在较小流量下,径流和泥沙的拦截效果更好,在200L/h流量下,拦截率分别可达33.2%和96.9%;在冲刷过程中,有无模拟植被过滤带产沙率与水流剪切力、水流功率都具有显著的相关关系,分别呈指数函数(R2=0.67,R2=0.83)和幂函数(R2=0.70,R2=0.87)增大关系;采用含水流剪切力和水流功率的非线性回归方程Rs=1.184×10-6τ-4.114ω3.839(R2=0.73)预测产沙率效果较好。
[Abstract]:In order to investigate the interception effect of vegetation filtration belt on runoff and sediment production on slope surface and its hydrodynamic mechanism, a simulated vegetation filter belt was set up on an indoor soil trough and a muddy water scour test was carried out. The runoff and sediment yield and related hydrodynamic parameters were obtained with or without simulated vegetation filtration zone. The interception effect of vegetation filtration zone on runoff and sediment was quantitatively analyzed and the relationship between sediment yield and hydrodynamic parameters on slope was discussed. The results show that the vegetation filter belt can effectively intercept runoff and sediment in the flushing test, and the interception efficiency of runoff and sediment is better under the smaller flow rate, and the interception rate can reach 33.2% and 96.9% under 200L/h flow, respectively, and in the process of scouring, the interception rate can reach 33.2% and 96.9%, respectively. There is a significant correlation between sediment yield and shear stress and flow power in simulated vegetation filtration zone, which are increased by exponential function (R2O0.67) and power function (R2O0.70R2 + 0.87), respectively. The nonlinear regression equation, Rs=1.184 脳 10-6 蟿 -4.114 蠅 3.839 R2O 0.73) is used to predict sediment yield.
【作者单位】：河海大学南方地区高效灌排与农业水土环境教育部重点实验室;溧阳市国土资源局;扬州市勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51679062) 江苏省水利科技项目(2016070) 江苏省国土资源科技项目(KJXM2016009)
【分类号】：S157

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