摘要
空心块体具有良好的阻水和促淤功能,近年来被广泛用于生态修复工程。本文结合水槽试验及Flow-3D数值模拟,分析了开敞型和半封闭型空心块体的阻水效应和泥沙淤积特性。结果表明:空心块体的开孔率对内部水流流速、紊动强度起主导作用,开孔率较小的半开敞型空心块体减速、制紊效果更强;开敞型和半封闭型空心块体近底层悬沙浓度分别增大56%和75%,两者均有利于促进泥沙在块体内部淤积,近底层水流紊动越强,泥沙淤积形态差异越大;空心块体所营造的低流速、泥沙微淤、内外连通的水沙环境是大型底栖生物的生境需求,半封闭型空心块体内部的低紊动水流结构更有利于大型底栖生物的栖息、繁衍。
Hollow blocks have good water blocking and siltation promotion functions,and have been widely used in ecological restoration projects in recent years.In this paper,combined with flume experiment and Flow-3D numerical simulation,the water blocking effect and sedimentation characteristics of open and semi-closed hollow blocks are analyzed.The results show that the permeability of the hollow block plays a leading role in the internal flow velocity and turbulence intensity,and the semi-open hollow block with small permeability has a better effect in slowing down and turbulence control.The suspended sediment concentration near the bottom of open and semi-closed hollow blocks increases by 56% and 75%,respectively.Both of them can promote the deposition of sediment in the block.The environment of low flow velocity,sediment micro-deposition and water and sediment connected inside and outside by hollow blocks is the habitat requirement of macrobenthos,the structure of low turbulent flow inside the semi-enclosed hollow block is more favorable for the habitat and reproduction of macrobenthos.
作者
侯仲荃
石进
王宪业
郭磊城
谢卫明
徐凡
黄明毅
何青
Hou Zhongquan;Shi Jin;Wang Xianye;Guo Leicheng;Xie Weiming;Xu Fan;Huang Mingyi;He Qing(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;Shanghai Waterway Engineering Design and Consulting Co.,Ltd,Shanghai 200120,China;Yangtze Estuary Waterway Administration Bureau,Ministry of Transport,Shanghai 200003,China;CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2022年第5期124-133,共10页
基金
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(20DZ1204701)。
