An urban rainstorm water accumulation assessment modeling method based on full space-time

Abstract

The invention discloses an urban rainstorm water accumulation assessment modeling method based on full space-time, and the method comprises the following steps: 1, obtaining DSM data containing surface information, employing a D8 algorithm to divide a water catchment area, and modifying the boundary of the water catchment area according to the connection and distribution conditions of a real pipenetwork, so as to obtain the divided water catchment area; 2, establishing a surface runoff production model, and calculating runoff production of each catchment area; Step 3, establishing a surface confluence model, and calculating confluence of each catchment area; And step 4, establishing a drainage experience model to carry out drainage calculation, and calculating the drainage capacity of each catchment area through the drainage experience model so as to obtain an urban inland inundation assessment result. The DSM is adopted to divide the urban catchment area, the influence of urban planning and construction on urban topography reconstruction can be well reflected, and the method is more practical; The problem that drainage calculation cannot be carried out due to lack of structural data of a drainage pipeline is solved, and the operation time of the model is remarkably shortened.

Description

Technical field [0001] The invention relates to the technical field of weather forecasting, in particular to a method for evaluating and modeling urban storm water based on full time and space. Background technique [0002] As my country's urbanization process continues to accelerate, the natural circulation of water has been artificially divided, and torrential rains and waterlogging frequently occur. The problem of heavy rain and waterlogging in cities in my country is quite serious. Between 2008 and 2010, 62% of cities have experienced waterlogging to varying degrees. Among them, 137 cities have experienced waterlogging disasters more than 3 times, and 57 of them have experienced waterlogging. The longest standing water in the city exceeds 12 hours. At present, there are still a considerable number of cities across the country that do not meet the flood control standards set by the state. Using GIS, land use data, DEM, etc. to build models for risk assessment will provide a b...

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Problems solved by technology

[0003] Most of the current urban rainstorm and waterlogging assessment models use the D8 algorithm to divide the catchment area on the DEM data, but the urban water catchment area divided in this way cannot reflect the impact of urban planning and construction on the transformation of urban topography, although there are some corresponding However, the effect is limited; most of the current rainstorm and waterlogging assessment models are based on hydrodynamic methods, and the calculation time is too long, and due to the difficulty in obtaining the structural data of the drainage pipes and the difficulty in determining the siltation of the pipes , There are uncertainties such as emergency shutdown of the sewer network and artificial drainage in order to prevent the river from being flooded in extreme rainy weather, resulting in the failure of the final model to achieve good results

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