植被浅沟的涝灾减灾补偿作用研究

Research on the effect of flood mitigation of vegetative swale

低影响开发(LID)可以较有效地修复传统的雨洪排泄及输送系统所破坏的水文机制,本文以桐庐县瑶琳嘉苑小区为研究区域,建立SWMM模型,对该小区城市化后以及加入了植被浅沟之后在不同降雨重现期下的雨洪过程进行对比分析,并且通过改变植被浅沟的布设位置与管道出口断面的位置分析比较植被浅沟的效果,对植被浅沟的减灾效果进行研究。结果表明:植被浅沟的减灾效果在低重现期下较为明显,且植被浅沟的减灾效果随着重现期的增大而降低,当降雨重现期增加到一定值时,植被浅沟则失去了作用;当植被浅沟的布设位置距离管道出口断面较近时,减灾效果较为明显,当植被浅沟距离出口断面较远时,减灾效果下降。

Low impact development （LID） can effectively repair the traditional rainwater excretion and destruction of the transmission system.In this paper, the SWMM model was established in Yaolingjiayuan district of Tonglu county, and the rainwater process under different rainfall return period was analyzed after the urbanization and the vegetative swale was added.The location of the vegetative swale and the location of the outlet section of the pipeline were compared with the effect of the vegetative swale, and the flood mitigation effect of the vegetative swale was studied.The results showed that the mitigation effect of vegetative swale is different under different rainfall return period.The mitigation effect of vegetative swale is more obvious in low return period and decreases with the increase of the return period.When return period of rainfall increases to a certain value, the mitigation effect will lose.By changing the setting position of vegetative swale, concluded that when vegetative swale is close to the outlet section, the mitigation effect will be more obvious, and with the increase of the distance, the mitigation effect will decrease.