基于SWMM模型的南昌市青山湖片区雨洪模拟研究

Simulation study on rainfall flood of Qingshan lake area in Nanchang by SWMM model

通过分析南昌市青山湖片区雨洪特点,利用SWMM建立了南昌市青山湖片区雨洪管理模型。选用南昌市有代表性的2场暴雨过程对模型参数进行了率定,选用南昌市有代表性的1场暴雨过程对模型进行了验证。研究得出了适合南昌市青山湖片区的模型参数:透水区与不透水区的洼蓄量分别为6.4 mm、3.3 mm;Horton公式最大入渗率、最小入渗率、下渗衰减系数分别为76.3 mm/h、3.15 mm/h、0.000 6;管道、透水区、不透水区的曼宁粗糙系数分别为0.014、0.016、0.028。最后对模型进行了验证,发现模型的计算值跟实测值非常接近,最终确定了南昌市青山湖区雨洪管理模型,为南昌市防洪减灾、预报分析和风险评估决策提供有效参考。

Through analyzing the characteristics of rainfall flood of Qingshan lake area in Nanchang, the rainfall flood management model was established using SWMM. Selecting the process of two typical rainstorms in Nanchang city to calibrate the parameters of the model, and then, choosing the process of a typical rainstorm to verify it. The proper model parameters of Qingshan lake area in Nanchang city were determined, the deposits permeable area and impermeable area were 6.4 and 3.3 mm respectively; the maximum and minimum infiltration rates of Horton formula were 76.3 and 3.15 mm/h respectively and the infiltration decay coefficients of it was 0.000 6. The Manning rough coefficient values of pipeline, permeable area and impermeable area were 0.014, 0.016 and 0.028 respectively. Finally, the model was validated, it was found that, the calculated value of the model was very close to the measured value, the rainfall flood management model of Qingshan lake area in Nan-chang city was finally determined, which could provide valuable reference for flood control and disaster reduc-tion, risk assessment and decision of Nanchang city.