景观河复合防渗及生态优化研究

Study on Compound Anti-Seepage and Ecological Optimization of Landscape River

景观河可改善城市水体,达到生态修复的目的。但由于地质及地下水位的影响,其内部的河水会发生渗漏现象。为了分析不同防渗方式的实施效果,采用潜水位下降率和渗漏量,对景观河的渗漏情况进行表征。结果表明,复合土工膜的渗透系数远小于采用防水毯和黏土压实防渗方式的渗透系数,表明采用复合土工膜可有效减小景观河的渗透性能,达到一定的抗渗效果。采用复合土工膜+防水毯的复合防渗措施,在经济、防渗效果及生态效益方面均存在一定的优势,可选择该方案作为景观河的防渗措施。同时,水位高度对其渗漏情况也存在一定的影响,在实际工程中,可采用调整景观河常水位的方式来减少其渗漏量。

The landscape river can improve the water body of the city river and achieve the aim of ecological restoration,but because of the influence of the geology and the groundwater level,the water in the river will leak,the seepage of the scenic river was characterized by the rate of decline of phreatic water level and the amount of seepage.The results show that the permeability coefficient of the composite geomembrane is far less than that of the waterproof blanket and the clay compaction,the application of composite geomembrane can effectively reduce the permeability of scenic river and achieve a certain anti-permeability effect.The composite anti-seepage measure of composite geomembrane+waterproof blanket has some advantages in economy,anti-seepage effect and ecological benefit.The water level of the river has a certain influence on its leakage.In the actual project,the method of adjusting the constant water level of the scenic river can be used to reduce its leakage.