Underground Space Flood Process under Extreme Rainstorm Based on a One-dimensional and Two-dimensional Hydrodynamic Coupling Model
In order to study the influence of short duration design rainstorm on underground space waterlogging,GAST model and SWMM model are coupled to form a one-dimensional two-dimensional hydrodynamic coupling model.Taking Tianfu Heyuan Community in Fengxi New City,Xixian New District,Shaanxi Province as the research object,this model was used to simulate the flood evolution process of the underground garage in the community under extreme rainfall conditions.The impact of short duration rainstorm on the water inflow of the underground garage in the community after taking temporary water retaining measures was explored.The results indicated that compared with two measured rainfall data,Nash-Sutcliffe Efficiency coefficients of the coupled model are 0.59 and 0.69.This model can accurately and reliably simulate surface and underground flood processes.As the design rainfall return period increases,the amount of water entering the underground space gradually increases.Under the short duration design rainstorm scenario,when the accumulated rainfall is greater than 52 mm,the underground garage will be flooded.After 0.3 m temporary water retaining measures are adopted,the underground garage in the community will not be submerged under the condition of a short duration design rainstorm return period of 10-50 years,and the water inflow of the garage will be reduced by 39.23％under the design rainstorm with a return period of 100 years.After adopting 0.5 m water retaining measures,the underground garage in the community will not be submerged,completely eliminating the risk of waterlogging.A one-dimensional and two-dimensional hydrodynamic coupling model can accurately simulate the flood processes on the surface to underground,providing a reference basis for scientific flood prevention and disaster reduction in underground spaces.
万方数据
维普
