侯仲荃,何青,王宪业,谢卫明,徐凡.生态空心块体水沙动力效应研究[J].海洋通报,2021,(3):
生态空心块体水沙动力效应研究
Study on dynamic effects of flow and sediment in ecological hollow block
投稿时间:2020-09-24  修订日期:2021-01-08
DOI:
中文关键词:  生态空心块体  柔性植被  水槽试验  水沙动力效应
英文关键词:ecological hollow block  flexible vegetation  flume experiment  dynamic effects of flow and sediment
基金项目:国家自然科学基金重点项目 (51739005);国家自然科学基金 (41876091);科技部中荷战略合作重点研发项目(2016YFE0133700);上海市科委重大研究项目 (18DZ1206400)
作者单位E-mail
侯仲荃 华东师范大学 河口海岸学国家重点实验室上海 200241 51183904048@stu.ecnu.edu.cn 
何青 华东师范大学 河口海岸学国家重点实验室上海 200241 qinghe@sklec.ecnu.edu.cn 
王宪业 华东师范大学 河口海岸学国家重点实验室上海 200241  
谢卫明 华东师范大学 河口海岸学国家重点实验室上海 200241  
徐凡 华东师范大学 河口海岸学国家重点实验室上海 200241  
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中文摘要:
      生态空心块体是一种兼有调控水流与生态修复功能的工程结构物,在海堤、丁坝等近海工程中被广泛应用。通过室内水槽试验,设计多种来水来沙工况,研究生态空心块体与柔性植被共同影响下的水沙动力特性,重点探究生态空心块体内的水沙动力效应。结果表明:生态空心块体组成的坝体结构缓流效果显著,坝体内外侧水流流速分布差异明显,坝体内部的水流流速远小于外侧水流流速;生态空心块体内紊动强度、雷诺应力在空心块体上方出现拐点,空心块体内紊动强度、雷诺应力均小于外侧;近底层水流在受壁面阻水作用下产生回流,易出现小范围旋涡;由于生态空心块体内水流流速、紊动强度的减小,内部悬沙浓度由表至底逐渐增大;柔性植被的冠层部分对水流减速、促淤效果最为明显,柔性植被会减缓前后相邻侧空心块体的水流流速,增大悬沙浓度。
英文摘要:
      The ecological hollow block is an engineering structure that regulating of water flow and ecological restoration, and is widely used in offshore engineering such as sea dikes and spur dikes. Through indoor flume experiments, a variety of incoming flow and sediment conditions are designed to study the dynamic characteristics of flow and sediment under the influence of ecological hollow blocks and flexible vegetation, and focus on the dynamic effects of flow and sediment in ecological hollow blocks. The results show that the dam structure composed of ecological hollow blocks has a significant slow-flow effect, and the distribution of water flow velocity inside the dam body is significantly different. The water flow velocity inside the dam body is much smaller than that outside; the turbulence intensity and Reynolds stress in the ecological hollow block are in the hollow. There is an inflection point above the block, and the turbulence intensity and Reynolds stress in the hollow block are smaller than the outside; the water flow near the bottom layer is blocked by the wall, and small-scale vortices are prone to appear due to the low flow velocity and turbulence intensity in the ecological hollow block. The internal suspended sediment concentration gradually increases from the surface to the bottom while water flow velocity and turbulence intensity decrease; the canopy of the flexible vegetation has the most obvious effect on decelerating water flow and promoting siltation. The flexible vegetation will slow down the flow velocity of the adjacent hollow blocks and increase the suspended sediment concentration.
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