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Stable water flow field-based method for simulating confluence of basin surface runoff

A surface runoff, simulation method technology, applied in computer simulation and GPU general computing, hydrodynamics field, can solve the forecast and assessment work that does not fully consider the continuous water volume income of watershed runoff, it is difficult to keep the water level relatively stable, and affects the risk of inundation and other problems to achieve the effect of high application value

Active Publication Date: 2018-01-16
CHENGDU UNIV OF INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the FloodArea model as an example, for a medium-sized watershed, the calculation of 24-hour runoff and inflow generally takes tens of minutes or even one to two hours, which seriously affects the forecast and assessment of inundation risk
[0018] On the other hand, most physical models do not fully consider the continuous water income of the basin runoff during the simulation period, such as the exchange of water volume between upstream water, groundwater and surface water, etc. The water level remains relatively stable in practice

Method used

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  • Stable water flow field-based method for simulating confluence of basin surface runoff
  • Stable water flow field-based method for simulating confluence of basin surface runoff
  • Stable water flow field-based method for simulating confluence of basin surface runoff

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Embodiment 1

[0070] The invention provides a method for simulating surface runoff and confluence in a watershed based on a stable water flow field, combining Figure 6 , the method includes:

[0071] S1. Establish the N-S equation in the grid mode, wherein each grid unit can only exchange water with the surrounding 8 adjacent grids, and decompose the N-S equation into advection items, pressure items and external force items;

[0072] S2. Carry out water flow mixing simulation in the runoff confluence model, wherein, on each time slice, each grid unit calculates the total momentum and total water volume with the surrounding 8 neighboring grids to obtain the described each grid unit new flow rate;

[0073] S3. Using the runoff confluence model obtained in S2 to iterate the water flow field in the watershed until the water depth and flow velocity in all positions of the entire watershed stop increasing and remain relatively stable, thereby obtaining a stable water flow field.

[0074] Prefe...

Embodiment 2

[0103] In this embodiment, the technical solution of the present invention is described in more detail.

[0104] The N-S equation algorithm that the present invention adopts is as follows:

[0105] The Navier-Stokes equation (N-S equation for short) is the governing equation of the confluence model. The N-S equation is the governing equation describing the motion of the fluid in hydrodynamics, which is deduced according to Newton's second theorem. Because the water flow movement in the runoff confluence is the same sex incompressible fluid movement. So the N-S formula is:

[0106]

[0107]

[0108] In the formula (1), u is the velocity field, t is the time, ρ is the fluid density constant, P is the pressure, ν is the kinematic viscosity coefficient, and F is the external force, which is usually the mass force acting on the fluid. and used in the formula (differential operator), which can be used in gradient, divergence and curl. Such as represents the gradient, ...

Embodiment 3

[0177] In one embodiment, the present invention provides a real-time calculation device for surface runoff and confluence simulation in a watershed.

[0178] The GPU general-purpose computing is introduced into the surface runoff and flow simulation of the watershed to realize the real-time performance of the runoff and flow simulation. Its core content is to design each step of runoff and confluence calculation, including water budget, advection item, pressure item, external force item and water flow mixing, as a computing unit that can run independently in grid units, and write GPU parallel computing code.

[0179] In a specific embodiment, the device is set as follows:

[0180] The device utilizes GPU to perform parallel computing, and sets the modeling process as a computing unit that can run independently in grid units; the device includes:

[0181] The stable water flow field generation module is used to set the stable water source supply in the basin, use the runoff co...

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Abstract

The invention provides a stable water flow field-based method for simulating confluence of basin surface runoff and a real-time calculation device. The method comprises the following steps: S1, establishing an N-S equation under a grid mode; S2, performing water flow mixing simulating in a runoff confluence mode; and S3, iterating a water flow field in a basin by utilizing the runoff confluence model obtained in the S2 so as to obtain a stable water flow field. The method can provide decision support to quick simulation and evaluation for rainstorm and flood disasters in a basin, and has a relatively high application value.

Description

technical field [0001] The invention relates to the fields of hydrodynamics, computer simulation and GPU general calculation. It specifically involves the key technologies of the river basin runoff and flow simulation series, including the establishment of a stable water flow field and GPU parallel computing of surface runoff and flow. Background technique [0002] The central and western regions of my country are mostly mountainous landforms, located in a subtropical humid climate, with humid and rainy summers. Under such landform and climatic conditions, mountain torrent geological disasters induced by heavy rainfall occur frequently every year, posing a great threat to local life and property safety. Rapid simulation and evaluation are of great significance. [0003] The runoff and flow model is the basis of runoff and flow simulation. Existing technologies can be roughly divided into lumped models and distributed and semi-distributed models. [0004] (1) Lumped model...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02A10/40
Inventor 陈军唐古拉文军吕朝阳刘意
Owner CHENGDU UNIV OF INFORMATION TECH
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