Influence of Rainwater Infiltration in Partial Anti-Seepage Bioretention on Adjacent Municipal Roads in Different Collapsible Grades Loess Sites

Xin Wen,Yanlin Jing,Zhiping Hu,Shaobo Chai,Xun Zhang,Xiaole Li

doi:10.3390/w13152055

Abstract

It is practical to carry out sponge cities to manage rain and floods in collapsible loess areas where water resources and water disasters are prominent. The infiltration laws of the partial anti-seepage bioretention in collapsible loess fields are helpful to ensure the effectiveness and safety of sponge city, which were learned from the field test and numerical model. The seepage field and displacement field of loess sites with different collapsibility grades were compared during rainwater infiltration of the bioretention with the numerical model; the suitability and optimization suggestions for foundation treatment of this structure in various sites were proposed. It is found that the infiltration characteristics can be divided into three stages, and the infiltration range of bioretention increases with increasing infiltration time under the same site type, and the higher the collapsibility level of the site is, the more significant the rise in infiltration range. The settlement of adjacent roads in class II and III collapsible fields is far greater than that in class I and is greater than the settlement standard. The facilities’ bottom part foundation can be replaced to ensure the functionality of the facilities and the safety of the surrounding roads in the actual project.

Highlights

Leal PachecoIn recent years, sponge cities based on low-impact development facilities have become an effective means of urban stormwater control, water resource management, and landscape improvement [1,2,3,4,5], which has led to sponge cities being popularized and constructed in the central and western regions of China (Figure 1)
The Icause of this loess site lasts for one day, I-3 indicates the seepage influence range of the upper part of the phenomenon may be related to loess as a typical specific unsaturated soil with a smaller biological retention facilities in the class I collapsible loess site when the ponding lasts for horizontal permeability coefficient than the vertical permeability coefficient
The validity of the model used to analyze the law of water infiltration under this condition is verified, and the results are as follows: (1) With increasing infiltration time, the water content at the bottom of the partial anti-seepage bioretention can be divided into three stages: initial stability, rapid growth, and slow growth

Summary

Introduction

Sponge cities based on low-impact development facilities have become an effective means of urban stormwater control, water resource management, and landscape improvement [1,2,3,4,5], which has led to sponge cities being popularized and constructed in the central and western regions of China (Figure 1) This measure can solve the urban waterlogging phenomenon caused by frequent extreme weather, alleviate the problem of water resource shortages, such as the evaporation of rainwater being far more significant than its rainfall, and actively improve the urban living environment [6]. Results show that bioretention facilities can significantly reduce the surface

Methods

Results

Conclusion