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An interactive method and system for large-scale flood scene simulation and early warning based on two-dimensional hydrodynamics

A technology of hydrodynamics and interactive methods, applied in the generation of 2D images, texture/color, instruments, etc., can solve the problems of lack of visualization and interaction modules, inability to provide some guidance for real-time decision-making, and achieve the effect of improving the effectiveness of early warning

Active Publication Date: 2021-12-21
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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  • An interactive method and system for large-scale flood scene simulation and early warning based on two-dimensional hydrodynamics
  • An interactive method and system for large-scale flood scene simulation and early warning based on two-dimensional hydrodynamics
  • An interactive method and system for large-scale flood scene simulation and early warning based on two-dimensional hydrodynamics

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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 simulation 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 t...

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Abstract

The invention discloses a large-scale flood scene simulation early warning interactive method and system based on a two-dimensional hydrodynamic method. 1) The disaster phenomenon of large-scale flood is modeled and drawn. 2) The semi-Lagrangian implicit integral method for solving shallow water equations is applied to flood simulation, which achieves a large time step and corrects volume and momentum conservation. 3) Apply GPGPU programming based on the Computer Shader framework to realize large-scale real-time parallelism of flood simulation. 4) Adaptive grid surface subdivision technology and texture tiling technology are introduced to realize the realistic water surface and effectively convey the information about the height and flow velocity of the flood. 5) The cubic B-spline interpolation method is used to solve the jagged problem of water boundary. 6) A disaster assessment model integrating flood submersion depth and building category is proposed, and the color of buildings can be changed in real time according to the assessment results to realize graded early warning. 7) Supports real-time interaction during flood evolution, showing the effect of setting baffles to block floods.

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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Patent Type & Authority Patents(China)
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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