基于SWMM模拟的山地村落雨水径流净化设施建设强度研究

The Construction Intensity of Rainwater Runoff Purification Facilities in Mountainous Villages Based on SWMM

我国水资源人均占有量少且浪费严重,农业用水利用率仅为40%~50%。在山地等高差较大区域的村落,由于基础设施的不完善以及地形地貌等因素影响,雨水径流引发的问题尤为突出。为实现坡地雨水集蓄质与量之间的平衡,通过SWMM软件构建简易模型,定义雨水径流净化设施面积与场地总面积的比值为建设强度,得到不同坡度下典型雨水径流净化设施——下凹绿地的使用效益结果,经回归分析证明各效益与建设强度存在线性关系。同时,通过行业内专家的问卷调查为雨水径流净化设施的综合效益评分,经定性与定量分析得出:山地村落雨水径流净化设施的最适建设强度区间分别为7%~9%,为山地村落雨水集蓄系统的建设提供理论依据。

In China,the per capita share of water resources is low,and the water wasting phenomenon is serious.The utilization rate of irrigation water is only 40%~50%.In the villages which has significant elevation differences in mountainous areas,the problems caused by rainwater runoff are more prominent due to the imperfection of infrastructure and topography.In order to achieve the balance between the quality and quantity of rainwater harvesting and storage on the slope land,we define the ratio of rainwater runoff purification facilities area to the total site area as the construction intensity through the simple model construction of SWMM,and obtain the utilization benefit results of typical rainwater runoff purification facilities:lower green space under different slopes.Regression analysis shows that there is a linear relationship between each benefit and the construction intensity.At the same time,through the questionnaire survey of experts to score the comprehensive benefits of rainwater runoff purification facilities,through qualitative and quantitative analysis,the optimal construction intensity range of rainwater runoff purification facilities in mountainous villages is 7%~9%,which provides a theoretical basis for the construction of rainwater harvesting and storage system in mountainous villages.