Plain river network urban flood simulation method for drainage basin water system and urban pipeline network coupling

Abstract

The invention discloses a plain river network urban flood simulation method for drainage basin water system and urban pipeline network coupling. The method comprises the following steps that: S1: constructing a drainage basin runoff model; S2: constructing an urban rain pipeline network model; S3: coupling the drainage basin runoff model with the urban rain pipeline network model; and S4: carryingout urban flood simulation and prediction. By use of the method, network analysis between a drainage basin water system and an urban boundary is established, the runoff models of different scales ofthe drainage basin and the city can be linked, simulation accuracy is improved, and the method is high in regional applicability.

Description

technical field [0001] The invention relates to the technical field of urban flood simulation, in particular to a method for simulating urban flood in a plain river network coupled with a river basin water system and an urban pipe network. Background technique [0002] Existing flood forecasting methods mainly focus on watershed surface flow and cannot accurately describe hydrological runoff in urban areas. The main model methods are: [0003] 1. Rainfall runoff method; [0004] 2. Muskingum method; [0005] 3. Neural network model (ANN); [0006] 4. Watershed hydrological model; [0007] 5. Urban stormwater model. [0008] Existing flood flow forecasting methods have the following drawbacks: [0009] (1) Traditional empirical formulas and hydrological models have limitations in considering the spatial distribution of the underlying surface. [0010] (2) For urban areas, rainfall production and confluence are affected by complex underlying surfaces and urban drainage ...

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Problems solved by technology

[0009] (1) Traditional empirical formulas and hydrological models have limitations in considering the spatial distribution of the underlying surface

[0010] (2) For urban areas, rainfall production and confluence are affected by complex underlying surfaces and urban drainage network planning, and most hydrological models cannot be included in the simulation of drainage network

[0011] (3) Only consider the hydrological cycle at a single scale of a river basin or city, without considering the impact of river basin runoff on water volume in urban areas

[0012] (4) Lack of understanding and prediction of the natural spatial hydrological process on which the water environment of the city depends

[0013] At present, the prediction of flood flow in urban areas is mostly focused on the simulation research of urban drainage pipe network, lacking the understanding and prediction of the hydrological process of natural space on which the urban water environment depends, and ignoring the interaction process between watershed runoff and urban water volume, urban flood water volume Simulation accuracy is greatly reduced

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