Research On Rainwater Seepage Path Optimization And Enhanced Infiltration

"Infiltration"is one of the core measures for building a sponge city.The problem of rain water infiltration has two sides.It not only has the advantages of supplementing groundwater,reducing runoff drainage,but also has the problem of disorderly infiltration and increasing the potential safety risk of water content to underground infrastructure,especially in collapsible loess.The paper proposes a technical scheme for the rainwater seepage route rule,and studies the rainwater seepage route of rainwater garden under two kinds of rules measures.And proposes a rainwater enhanced infiltration structure with enhanced infiltration,and tests and simulates its infiltration effect.The mainly results are as follows:(1)We established the rainwater seepage route and the mathematical model of the infiltration structure based on the HYDRUS-2D software platform.We also selected the basic equation,and set the initial conditions and boundary conditions of the model,and determined the soil moisture of the tested soil.The R~2 and RMSE of the test results and simulation results were 0.935,0.902,0.892,0.854and 0.022cm,0.029cm,0.026cm,and0.021cm,respectively.(2)Compared with the non-set side,rainwater gardens are provided with regular rainwater seepage paths on one side of the impervious material,and the maximum water content at the corresponding observation point can be reduced by 13%.Continuous simulation results show that the maximum moisture content at the corresponding six observation points can be reduced by 10%,16%,21%,5%,10%,and 12%based on 1-year rainfall data.The water resistance of the impermeable material is the main reason for regular rainwater seepage.(3)Lateral compaction optimization test results of the seepage path of the rain garden showed that after the compaction,the seepage path of the rainwater garden profile changed from a symmetrical distribution to an asymmetric distribution,and the wetting pattern of the wet side of the compacted side was significantly smaller than the non-compacted side.Continuous simulation results show that the greater the degree of lateral compaction,the better the effect of seepage path optimization.(4)The simulation results of the enhanced infiltration structure show that more infiltration of rainwater can be achieved compared with the traditional infiltration structure,and the enhanced infiltration structure can promote deep infiltration and deep horizontal infiltration of rainfall,thereby increasing the infiltration volume.The greater the rainfall intensity,the greater the amount of infiltration,the optimized size of each part of the reinforced infiltration structure can further improve the infiltration effect.