土工格室降低湖泊内源释放模拟分析
发布时间:2017-12-27 11:34
本文关键词:土工格室降低湖泊内源释放模拟分析 出处:《岩土工程学报》2016年S1期 论文类型:期刊论文
【摘要】:湖泊富营养化与内源释放有密切的关系,降低湖泊因水动力作用引起的底泥再悬浮可大幅度减少湖泊内源污染物的释放。使用数值方法模拟水流在遇到阻碍后的流速变化,分析比较了不同规格的土工格室对湖泊流速的降低情况。结果表明:水流经过土工格室后,湖底的流速有较大程度下降;土工格室上方区域流速随格室高度增加而加快,土工格室后方底层区域流速大小随着土工格室高度的增高而降低,土工格室能将其后方大部分区域内的流速降低到"个别动"起动流速以下;增加土工格室长度对流速影响幅度有限。
[Abstract]:There is a close relationship between lake eutrophication and endogenous release. Reducing the sediment resuspension caused by hydrodynamic effect can greatly reduce the release of endogenous pollutants in lakes. The numerical method is used to simulate the flow velocity changes after the obstruction of the water. The reduction of the flow rate of the lake with different specifications is analyzed and compared. The results show that the water flow through the geocell, the bottom velocity decreased significantly; geocell area above the cell height increases with the flow speed, the geocell rear bottom area of the flow velocity decreases with the increasing height of geogrid, geocell can be behind most of velocity within the area is reduced to "stop" starting velocity; increase the effect of geocell length on the limited range of velocity.
【作者单位】: 东南大学岩土工程研究所;江苏省城市地下工程与环境安全重点实验室;
【基金】:国家重点基础研究发展计划项目(2008CB418100)
【分类号】:X524
【正文快照】: 0引言随着城市化进程加快,工农业迅速发展,氮、磷等营养物质大量进入我国湖泊,湖泊富营养化日益严重。以太湖为例,太湖在20世纪80年代初时,平均水质为Ⅱ类,但是当进入21世纪后,太湖的平均水质降到了Ⅳ类,在某些局部地方的水体水质已经降到了Ⅴ类甚至劣Ⅴ类[1]。湖泊水体富营养,
本文编号:1341546
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