HEJuan,LIANGXiao-guang,WENWei-hua,et al.Algorithm Improvement of SWMM Infiltration Model[J].China Water & Wastewater,2022,38(7):122-125.
SWMM下渗模型算法改进研究
- Title:
- Algorithm Improvement of SWMM Infiltration Model
- Keywords:
- SWMM; infiltration model; algorithm improvement
- 摘要:
- SWMM下渗模型无法处理模拟开始时土壤处于不完全干燥状态的情况。通过在Horton模型中引入初始下渗速率参数、在Green-Ampt模型中引入初始湿度亏损参数、在曲线数模型中引入初始曲线数参数,使土壤初始状态得以被考虑进模型计算过程中。针对SWMM中不同类型的下渗模型,给出了初始累积下渗量、初始下渗时间、初始累积降雨量等过程状态参数的计算方法。以单一降雨事件为例,说明改进算法的可行性。案例计算结果表明,在土壤处于初始不完全干燥状态时,土壤下渗能力出现了明显降低。
- Abstract:
- Infiltration model of SWMM cannot handle the situation that the soil is not completely dry at the beginning of the simulation. The initial state of soil was considered in the calculation process of the model by introducing initial infiltration rate parameter in Horton model, initial moisture deficit parameter in Green-Ampt model, and initial curve number parameter in curve number model. According to different types of infiltration model in SWMM, this paper introduced the methods for calculation of intermediate state parameters, such as initial cumulative infiltration volume, initial infiltration time and initial cumulative rainfall volume. A single rainfall event was taken as an example to illustrate the feasibility of the improving algorithm. The results showed that the infiltration capacity of soil was obviously reduced when the soil was in initial incompletely dry state.
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