| 杨克君,刘兴年,曹叔尤,张之湘.植被作用下的复式河槽漫滩水流紊动特性[J].水利学报,2005,36(10):1263-1268 |
| 植被作用下的复式河槽漫滩水流紊动特性 |
| Turbulence characteristics of overbank flow in compound river channel with vegetated floodplain |
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| DOI： |
| 中文关键词: 漫滩水流 随机性 复式河槽 植被 动量交换 紊动强度 |
| 英文关键词: overbank flow turbulence characteristics compound river channel floodplain vegetation momentum transfer turbulence intensity |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| The turbulence characteristic of overbank flow in compound river channel with vegetated floodplain was studied experimentally by model test. The shrubs, arbors and grasses were modeled by using plastic straws, feather and plastic grasses respectively. A 3-D ADV was used to measure the flow velocities. It is found that the distributions of fluctuating velocity in three directions obey the law of normal distribution. The time-averaged velocity is related to the sampling duration. If the floodplain is vegetated, the lateral exchange of momentum becomes intensive and the momentum is transferred from the main channel to its associated floodplain. The effects of different kinds of vegetation on turbulence are not the same. The turbulence intensity increases after the floodplain is vegetated. The lateral and vertical turbulence intensities are in the same order and follow the S-shape distribution law. |
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