Flood efficient early warning method based on hydrological-hydrodynamic integrated model and application of flood efficient early warning method

Abstract

The invention discloses an efficient flood early warning method based on a hydrological-hydrodynamic integrated model and application thereof. The method comprises the following steps: collecting topographic data and land utilization data of a certain area; inputting hourly rainfall intensity R; establishing a balance relationship among the total input rate, the total water storage increase rate and the total output rate in the water collection area by using the law of conservation of mass through a hydrological physical model; according to a 2Dkinematics-wave hydrodynamic model, establishing a hydraulic relation between the outflow velocity of the section and the average water depth of the section; establishing a two-layer simultaneous relationship of the two models according to the fact that the outflow velocity of the cross section calculated by the hydrological physical model and the hydrodynamic model should be equal to the total water storage capacity in the water collection area all the time; constructing a flood efficient early warning equation based on a hydrological-hydrodynamic integrated model; according to historical observation data, continuously calibrating calculation parameters in the efficient flood early warning method based on the hydrological-hydrodynamic integrated model; and outputting calculation results of the water depth and the flow velocity of the flood.

Description

technical field [0001] The invention relates to an early warning method and application thereof, in particular to a flood efficient early warning method based on a hydrology-hydrodynamic integration model and its application. Background technique [0002] Flood disasters have caused great harm to national property and people's lives. Distributed flood depth and flow velocity are two crucial hydraulic parameters in flood evolution scenario simulations in watersheds. At present, the water depth and flow velocity of distributed floods are mainly calculated using a simple hydrodynamic model or a hydrology-hydrodynamic coupled model. However, the current simple hydrodynamic model can not fully meet the needs of flood simulation and forecasting in the basin , 2021, 52(10): 1137-1150.); on the other hand, although the hydrology-hydrodynamic coupling model replaces / simplifies part of the hydrodynamic calculation through hydrological calculation, it improves the calculation efficie...

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Problems solved by technology

Including: obtaining the input data of the watershed to be predicted; inputting the input data into the water environment prediction model; Water body to the dynamic simulation of ecology; In addition, although the existing technologies such as public number: CN112528563A, CN112949167A, CN113723024A, CN113792437A, CN113902211A have all realized the early warning of flood by steps such as collecting information, model building, but, above-mentioned prior art all does not will The hydrophysical model is integrated with the 2D kinematic-wave hydrodynamic model to construct the ordinary differential equation of the flood warning method, which leads to the defects of high calculation difficulty and low calculation efficiency

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