XIAO Jun-jian,GAO Yan,WAN Fan,et al. Analysis on Waterlogging Risk of Tangxun Lake Water System under Super-long Duration Rainstorm in Wuhan City [J].China Water & Wastewater,2020,36(13):89-95.
Analysis on Waterlogging Risk of Tangxun Lake Water System under Super-long Duration Rainstorm in Wuhan City
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
13
Page:
89-95
Column:
Date of publication:
2020-07-01
- Keywords:
- super-long duration rainstorm; waterlogging risk; drainage standard; hydraulic model; Tangxun Lake water system
- Abstract:
-
When designing urban waterlogging prevention and control facilities, the rainfall duration is determined according to the service area of the facility, and 3-24 h long duration rainfall is usually adopted. Wuhan is located in a plain lake area, and its rainwater system has a large catchment area. When encountering a continuous heavy rain (1-7 d), the lake which hasn’t enough time to vacate the storage capacity may suffer systematic waterlogging disaster. Therefore, 3-24 h long duration rainfall is unable to meet the design needs of drainage facilities. Taking the Tangxun Lake water system as an example, the characteristics and frequency of the heavy rain (1-7 d) in Wuhan were explored and the waterlogging risk caused by longterm torrential rain was systematically analyzed through constructing hydrodynamic model of Tangxun Lake water system. The waterlogging risk during the longterm torrential rain should be checked to insure the drainage safety of the Tangxun Lake water system, and it was safer to use 2day design rainfall to design the Tangxun Lake water system with return period of 50 years.
Last Update:
2020-07-01