坡面产流产沙过程对植被过滤带响应的试验研究  

Experimental Study on the Response of Slope Runoff and Erosion Process to Vegetative Filter Strip

作　　者：陈倩[1] 傅瑜[2] 佘冬立[1] 冯晓红 罗和文 CHEN Qian;FU Yu;SHE Dongli;FENG Xiaohong;LUO Hewen(Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing 210098;Liyang Bureau of Land and Resources, Liyang, Jiangsu 213300;Yangzhou Survey Design Research Institute Co. , Ltd, Yangzhou, Jiangsu 225007)

机构地区：[1]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,南京210098 [2]溧阳市国土资源局,江苏溧阳213300 [3]扬州市勘测设计研究院有限公司,江苏扬州225007

出　　处：《水土保持学报》2017年第6期104-109,共6页Journal of Soil and Water Conservation

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)

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。In order to study the interception effect and hydrodynamic mechanism of vegetative filter strips（VFS）during runoff and sediment yield progress on slope surface,a simulated vegetation filter belt was set up on the inner soil trough,and the muddy water erosion tests were carried out.After getting the runoff and sediment yield and related hydrodynamic parameters under the situation of with or without vegetative filter strip through the tests,the vegetation filter intercepting effect of runoff and sediment was quantitatively analyzed and the relationship between sediment production rate and hydrodynamic parameters was explored.The results showed that VFS could effectively intercept runoff and sediments during the tests,and the interception rate was better under smaller flow.When the flow was 200 L/h,the interception rate was33.2%for runoff and 96.9%for sediments.During the scouring process,the sediment yield rate had significant correlation with flow shear stress and stream power under the situation of with or without VFS,which were positive exponential function relationships（R^2=0.67,R^2=0.83）with flow shear stress and power function relationships（R^2=0.70,R^2=0.87）with flow power,respectively.Using a nonlinear regression equation Rs=1.184×10^-6τ^-4.114ω^3.839（R^2=0.73）with flow shear force and stream power to predict the sediment yield rate could get a better effect.

关 键 词：植被过滤带 径流拦截率 产沙率 水动力学参数 

分 类 号：S157.2[农业科学—土壤学]