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Modeling method for three-dimensional hydrodynamic numerical model of large shallow lake

A technology of numerical model and modeling method, applied in the field of water environment

Pending Publication Date: 2021-05-04
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a three-dimensional hydrodynamic numerical model modeling method for large shallow lakes considering the interaction of waves and currents in view of the existing problems in the research on hydrodynamic numerical models of large shallow water lakes

Method used

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  • Modeling method for three-dimensional hydrodynamic numerical model of large shallow lake
  • Modeling method for three-dimensional hydrodynamic numerical model of large shallow lake
  • Modeling method for three-dimensional hydrodynamic numerical model of large shallow lake

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Embodiment 1

[0039] This embodiment specifically illustrates the modeling method of the present invention.

[0040] Taihu Lake (30°55′40″-31°32′58″N, 119°52′32″-120°36′10″E), located in the core area of ​​the Yangtze River Delta in China, is a large shallow lake in the shape of a shallow dish. Under the condition of annual average water level of 3m, the water surface area of ​​Taihu Lake is 2339km 2 , the average water depth is 1.9m, and the average slope is 19.7″. Taihu Lake is located in the East Asian monsoon climate zone, and the wind field is mainly affected by the East Asian monsoon: the annual average wind speed is 3.4±0.19m s -1 ; The southeast wind prevails from April to August; the northwest wind prevails in other months. In addition, in August and September each year, the Taihu Basin is vulnerable to typhoons. Although we have not fully understood the hydrodynamic structure of Taihu Lake, it has been widely accepted that the hydrodynamic structure of Taihu Lake is determined b...

Embodiment 2

[0127] This example illustrates the solution process and accuracy evaluation of the WHM-3D model in the specific case of Taihu Lake.

[0128] 1. WHM-3D settings

[0129] The LCM calculation grid is set as follows: a 1km square grid is used in the horizontal direction (x-o-y) to discretize the calculation domain to form a 72×72 calculation grid; the vertical direction (σ) is divided into 5 layers; the calculation time step is 30s. α, β and γ are all taken as 0.5. Both Li et al. (2011) and Zhao et al. (2012) believed that the flow in and out of the lake has little effect on the flow field of Lake Tai, which can be ignored in the numerical model of lake flow. Therefore, in the numerical simulation of Taihu Lake hydrodynamics under the influence of the short-term strong wind process, the flow in and out of the lake will not be considered. The input data of water air interface include air temperature, air pressure, cloud cover, relative humidity, wind speed and wind direction. A...

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Abstract

The invention relates to a modeling method for a three-dimensional hydrodynamic numerical model of a large shallow lake. The method comprises the steps of establishing a three-dimensional lake flow numerical model LCM and a shallow water storm numerical model SWAN for a modeling area, wherein the LCM model is established in a sigma coordinate system, the control equations are a continuous equation, a momentum conservation equation and a thermodynamic equation, and the momentum conservation equation comprises a wave-induced radiation stress item; applying boundary conditions to the LCM, wherein the boundary conditions comprise a water-gas boundary condition, a water-soil boundary condition and heat flux, wind stress is applied to the water-gas boundary, and lake bed friction resistance is considered on the water-soil boundary; and finally, establishing a wind wave and lake flow coupled numerical model WHM-3D based on the LCM and the SWAN. The WHM-3D model established by the modeling method disclosed by the invention has the capability of simulating spatial and temporal changes of wave characteristic elements; the simulation precision of the flow velocity is obviously improved, and the movement process of the wind-generated water body in the Taihu Lake under the prevailing wind field condition can be more accurately simulated.

Description

technical field [0001] The invention relates to the technical field of water environment, in particular to a modeling method for a three-dimensional hydrodynamic numerical model of a large shallow lake considering wave-current interaction. Background technique [0002] The lake hydrodynamic-ecological numerical model based on hydrodynamics is an important means to study the lake ecological environment process from the whole lake scale. Generally, lake hydrodynamics refers to the continuous movement of lake water in the lake basin under the influence of wind, density, and inflow and outflow. The convective diffusion caused by the movement of the water body also makes the pollutants in the water body migrate in time and space. As the main means of simulating this time-space migration, the hydrodynamic-ecological model has been widely used in the research on the ecological environment of the world's famous Great Lakes, including: Laurentian Great Lakes (Hoffman&Hittinger, 2017...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F119/14
CPCG06F30/28G06F2111/10G06F2119/14Y02T90/00
Inventor 吴挺峰秦伯强
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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