植物生长对含沙水流特性的影响研究  

Influence of Vegetation Growth on Characteristics of Concentration Flow

作　　者：李君宁[1] 杨具瑞[1] 罗晶[2] 程浩亮[1] 凌祯[1] 

机构地区：[1]昆明理工大学电力工程学院水利水电工程系,云南昆明650051 [2]四川大学水力学及山区河流开发保护国家重点实验室,四川成都610065

出　　处：《水电能源科学》2011年第7期67-70,195,共5页Water Resources and Power

基　　金：国家自然科学基金资助项目(50769001);云南省自然科学基金资助项目(2008ZC017M);云南省中青年后备人才基金资助项目(2005PY01-34)

摘　　要：采用无植物和高2、5、9 cm模拟植物的12组次的水槽试验,探讨了植物生长对含沙水流特性的影响规律。试验结果表明,含沙水流流速分布在植物带中不再符合对数分布形式,而为S型分布;水流的雷诺数和弗劳德数随植物高度增加而减小,随流量增加而增大;糙率随植物高度增加而增大,随流量增大而减小;悬移质浓度垂向分布随植物高度增加而降低,随流量增加而增大,沿植物带水流方向悬移质浓度逐渐降低。The influence of vegetation growth on characteristics of concentration flow are investigated by using 12 groups flume experiment with no plant and plant height of 2, 5, 9 cm. The results show that the vertical velocity distribution of sediment flow in the plant is no longer consistent with logarithmic distribution while it is the S-type distributiom Reynolds number and Froude number of flow decrease with the increase of plant height; it increases with the increase of discharge; roughness increases with the increase of plant height; it decreases with the discharge increases; vertical distribution of suspended sediment concentration decreases with the increase of plant height; it increases with the increase of discharge; the concentration of suspended sediment decreases along the flow direction of plants.

关 键 词：植物生长 含沙水流 流速 雷诺数 弗劳德数 糙率 悬移质垂向浓度 

分 类 号：TV131.65[水利工程—水力学及河流动力学]