Urban rainstorm waterlogging assessment and modeling method

Abstract

The invention discloses an urban rainstorm waterlogging assessment and modeling method. The method comprises the steps that an urban earth's surface runoff producing model is established, a time-integration method is adopted to calculate accumulated infiltration and accumulated produced runoff at a moment t, wherein t represents rainfall time; according to the calculated accumulated infiltration and accumulated produced runoff at the moment t, hour-by-hour continuous simulation is conducted on a ponding zone and ponding depth of rainstorm waterlogging by obtaining the rainfall capacity hour by hour and utilizing an equal-volume method, and an urban earth's surface confluence model is established to obtain urban rainstorm waterlogging simulation result at corresponding moment. The time-integration method is adopted to respectively process a water permeable zone and a water non-permeable zone, hour-by-hour continuous simulation can be performed by inputting hour-by-hour rainfall capacities, and real-time forecasting and estimation of the rainstorm waterlogging are achieved through butt joint with rainfall forecasting. According to the method, the whole urban waterlogging and water receding process is considered, and hour-by-hour elaborate simulation of urban waterlogging can be achieved, so that real-time operation influencing the model in forecasting becomes possible.

Description

technical field [0001] The invention relates to the technical field of meteorological prediction, in particular to a method for evaluating and modeling urban rainstorm and waterlogging. Background technique [0002] With the advancement of urbanization, rainstorm and waterlogging have gradually become the main natural disasters in many cities. In the face of severe urban rainstorm and waterlogging disasters, based on the urban waterlogging model, carrying out refined rainstorm and waterlogging impact and risk early warning is the key to reducing rainstorm and waterlogging disasters and reducing property. effective means of loss. [0003] Most of the current rainstorm waterlogging models are based on hydrodynamic methods, which require a large number of input parameters, which are not easy to promote and apply; and the existing generalized models can only simulate the entire rainfall process and cannot perform continuous simulation time by time. Contents of the invention ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for evaluating urban waterlogging and waterlogging. It adopts a generalization method to construct a model for evaluating urban waterlogging and rainstorms. Time-by-time continuous simulation and calculation of water accumulation and receding processes solve the problem that existing generalized models can only simulate the entire rainfall process but cannot predict waterlogging

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