Case Study of Urban Stormwater Simulation in Foshan Based on Urban Time-Variant Gain Model
The prerequisite for urban stormwater simulation and analysis is to accurately grasp urban rainfall-runoff response laws.This paper analyzes the nonlinear response law of rainfall-runoff and builds a TVGM-urban model to simulate and analyze the measured rainfall and storm scenarios designed under di...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2023-01-01
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| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2023.10.015 |
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| Summary: | The prerequisite for urban stormwater simulation and analysis is to accurately grasp urban rainfall-runoff response laws.This paper analyzes the nonlinear response law of rainfall-runoff and builds a TVGM-urban model to simulate and analyze the measured rainfall and storm scenarios designed under different recurrence periods by taking the Baolitongjifu neighborhood in Chancheng District,Foshan as the research object.The results are as follows.There is a power function correlation between rainfall and runoff in the city.The non-linear relationship between maximum rainfall intensity and peak flood flow can be verified by eight selected flood data in the neighborhood with the fitting effect of the power function (R<sup>2</sup>=0.6207,p<0.05) better than that of the linear relationship (R<sup>2</sup>=0.5629,p<0.05).Based on the identification of the catchment area and the subsurface classification,the TVGM-urban model is built in the Baolitongjifu neighborhood,and the model accuracy is verified by the measured rainfall and runoff data.Generally,the simulation results ensure that the Nash efficiency coefficient is greater than 0.7,and the simulation error of the water volume and peak value is within 20%,which can well meet the urban stormwater simulation requirements.The results can provide support and references for analyzing urban rainfall and runoff response laws and studying urban stormwater simulation. |
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| ISSN: | 1001-9235 |