清水冲刷不连续宽级配床面阻力特性及输沙规律试验研究(Ⅰ)——床面阻力特性  

Experimental study of flow resistance and bed load transport of bed material with discontinuous wide-gradation sediment by clear water scouring(Ⅰ)——Flow resistance characteristics

作　　者：魏丽[1,2] 卢金友[3] 徐海涛[3] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院-水利部成都山地灾害与环境研究所,四川成都610041 [3]长江水利委员会长江科学院,湖北武汉430010

出　　处：《泥沙研究》2012年第4期1-5,共5页Journal of Sediment Research

基　　金：国家自然科学基金(50879006);中国科学院知识创新工程重要方向项目群(KZCX2-YW-JS305);中国科学院成都山地灾害与环境研究所青年百人团队项目

摘　　要：不连续宽级配床沙在天然河道中广泛存在,作为非均匀沙的特殊类型,其床面阻力与一般意义上的非均匀床面相比具有不同的特性。本文通过水槽试验对不连续宽级配床面阻力特性进行了探讨,引入峰度系数表征粗糙床面床沙粒径的非均匀性,将不连续宽级配床面与连续宽级配床面统一起来,根据试验数据拟合得到不连续宽级配床面阻力系数表达式,具有较好的精度。Discontinuous wide-gradation sediment widely exists in natural rivers as a specific type of non-uniform sediment.It has different flow resistance with rough bed while compared with traditional non-uniform sediment.The flow resistance of rough bed with discontinuous wide-gradation sediment was studied by flume experiment.In the paper,the bimodality parameter is introduced to express bed nonuniformity,so as to unify the rough bed with discontinuous and continuous wide-gradation sediment.Moreover,the resistance coefficient of rough bed with discontinuous wide-gradation sediment was fitted by experiment data with good accuracy.

关 键 词：不连续宽级配床面 阻力特性 峰度系数 

分 类 号：TV143.4[水利工程—水力学及河流动力学]