植被作用下的复式河槽漫滩水流紊动特性

被引:47
作者
杨克君
刘兴年
曹叔尤
张之湘
机构
[1] 四川大学水力学与山区河流开发保护国家重点实验室
[2] 四川大学水力学与山区河流开发保护国家重点实验室 四川成都
[3] 四川成都
关键词
漫滩水流; 随机性; 复式河槽; 植被; 动量交换; 紊动强度;
D O I
10.13243/j.cnki.slxb.2005.10.022
中图分类号
TV133 [河渠水力学];
学科分类号
0801 ; 080103 ; 080104 ; 081502 ;
摘要
分别选取塑料吸管、鸭毛和塑料大草模拟乔木、灌木和野草,通过水槽试验,探讨了不同滩地植物作用下的漫滩水流紊动特性。试验结果表明,纵向、横向和垂向三个方向的脉动流速基本满足正态分布;时均流速与采样时间的长短有关;横向动量交换比垂向动量交换大,横向动量基本上是主槽向滩地传递;不同的滩地植物对水流的紊动强度的影响不同。滩地种植植物后,水流的紊动强度增强,纵向和垂向的紊动强度相当,都服从S型分布。
引用
收藏
页码:1263 / 1268
页数:6
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