Large-scale flood scene simulation early warning interaction method based on two-dimensional hydrodynamics and early warning interaction system

A technology of hydrodynamics and scene simulation, applied in the generation of 2D images, texture/color, instruments, etc., can solve the problems of lack of visualization and interaction modules, and the inability to provide some guidance for real-time decision-making, so as to improve flood prevention awareness and early warning , Improve the effectiveness of early warning, the effect of large time steps

Active Publication Date: 2020-05-22
ZHEJIANG UNIV
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Problems solved by technology

The disadvantage lies in the lack of relatively complete visualization and interactive modules, which cannot provide some guidance for decision makers in real-time decision-making

Method used

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  • Large-scale flood scene simulation early warning interaction method based on two-dimensional hydrodynamics and early warning interaction system
  • Large-scale flood scene simulation early warning interaction method based on two-dimensional hydrodynamics and early warning interaction system
  • Large-scale flood scene simulation early warning interaction method based on two-dimensional hydrodynamics and early warning interaction system

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Embodiment Construction

[0031] The present invention is described in detail below through specific examples.

[0032] Such as image 3 Shown is the schematic flow chart of the present invention, specifically comprises the following steps:

[0033] Step 1, preprocessing, initialization:

[0034] 1.1) Subdivide the simulated scene into m*n uniform grids on the horizontal plane, with m equal divisions in the x direction and n equal divisions in the y direction. The basic grid is a square with side length Δx, and the time step is Δt. To ensure stability, staggered grids are used to represent physical quantities, the height of the water body and the height of the basic terrain are stored in the grid center, and the velocity is stored in the grid boundary; figure 1 The Shanghai Pudong River scene selected for this invention.

[0035] 1.2) Write the shallow water equation in Lagrangian form:

[0036]

[0037]

[0038]

[0039] Among them, u represents the speed in the x direction, v represents th...

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Abstract

The invention discloses a large-scale flood scene simulation early warning interaction method based on a two-dimensional hydrodynamics method and an early warning interaction system. The method comprises the steps of 1) modeling and drawing a disaster phenomenon of large-scale flood; 2) applying a method for solving a shallow water equation by using a semi-Lagrange implicit integration method to flood simulation so as to achieve a large time step length, and carrying out volume and momentum conservation correction; 3) applying GPGPU programming to realize large-scale real-time parallelism of flood simulation on the basis of a Computer Shader framework; 4) introducing an adaptive grid curved surface subdivision technology and a texture tiling technology so as to realize a realistic water surface, and effectively transmitting related information of the height and the flow velocity of the flood; 5) solving water body boundary sawtooth problem by applying a cubic B-spline interpolation mode; 6) providing a disaster assessment model integrating flood flooding water depth and building types, and changing the building color in real time according to an assessment result to achieve gradedearly warning, and 7) supporting real-time interaction in the flood routing process and displaying the effect of blocking flood by arranging baffles.

Description

technical field [0001] The present invention relates to a flood scene simulation method, in particular to an interactive method and system for large-scale flood scene simulation early warning based on two-dimensional hydrodynamics. Background technique [0002] Flood refers to a natural phenomenon in which the hydrological environment such as rivers, lakes, and oceans rises beyond the normal water level. Flood disasters in my country are both universal and regional in space; in time, they are not only disorderly and unstable, but also have orderly rhythm and periodicity. A large number of studies have shown that flood disasters have complex characteristics such as heterogeneity and difference, diversity, randomness and predictability, mutation and regularity. It is of great significance to the research and simulation of floods. A mature and complete simulation system can give ordinary people early warning of floods, improve awareness of flood prevention, and provide reliabl...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06T11/00G06F119/14
CPCG06T11/001
Inventor 夏浩刘鑫铖张海童王章野
Owner ZHEJIANG UNIV
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