透水砖堵塞程度对径流颗粒物冲刷规律的影响

Influence of blockage degree of permeable brick on scouring law of runoff particles

针对目前透水砖堵塞后引起径流颗粒物输出规律变化不清晰的问题,采用模型模拟、因素分析等方法研究透水砖堵塞对其表面径流颗粒物冲刷规律的影响。结果表明,堵塞程度、降雨重现期是影响透水砖表面径流颗粒物冲刷过程的重要因素,堵塞程度越高、重现期越大,初期冲刷效应越强烈、颗粒物累积冲刷量越大;结合不同降雨重现期下,各堵塞程度透水砖表面径流颗粒物冲刷过程,引入堵塞程度r这一动态变化量修正传统指数冲刷模型,建立了适用于不同堵塞程度透水砖的径流颗粒物冲刷模型;透水砖堵塞程度可显著影响径流中颗粒物粒径分布,且与降雨重现期、径流历时存在交互影响作用。

In view of the unclear change of runoff particle output law caused by permeable brick blockage, the influence of permeable brick blockage on the surface runoff particle scouring law was studied by means of model simulation and factor analysis. The results show that the blocking degree and rainfall return period are important factors affecting the particle scouring process of runoff on the surface of permeable brick. The higher the blocking degree and rainfall return period, the stronger the initial scouring effect and the greater the cumulative scouring amount of particles. Combined with the runoff particle scouring process of permeable bricks with different blocking degrees under different rainfall return periods, the dynamic variation of blocking degree is introduced to modify the traditional exponential scouring model, and the runoff particle scouring model suitable for permeable brick with different blocking degrees is established. The blocking degree of permeable brick can significantly affect the particle size distribution in runoff, and has an interactive effect with rainfall return period and runoff duration.