A Quantitative Calculation Method of Sea Surface Stress Induced by Rainfall

A quantitative calculation and stress technology, which is applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve problems such as the quantitative calculation method of rainfall-induced sea surface stress that has not yet been researched, and achieve deepening cognition and understanding, physical well-defined effects

Active Publication Date: 2022-05-06
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

[0006] So far, no research has given a quantitative calculation method for rainfall-induced sea surface stress

Method used

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  • A Quantitative Calculation Method of Sea Surface Stress Induced by Rainfall
  • A Quantitative Calculation Method of Sea Surface Stress Induced by Rainfall
  • A Quantitative Calculation Method of Sea Surface Stress Induced by Rainfall

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for quantitatively calculating rainfall-induced sea surface stress, specifically comprising the following steps:

[0039] (1) Collect observed or simulated wind speed data and rainfall rates;

[0040] (2) According to Calculate the boundary layer height h, and the height where the minimum value ε is located is the boundary layer height h;

[0041] (3) According to the force analysis of gravity and air resistance in the falling process of raindrops in the boundary layer, the three-dimensional motion model of raindrops with particle size D is established as follows:

[0042]

[0043] in,

[0044]

[0045] (4) Discretize the numerical value of the raindrop three-dimensional motion model equation, and obtain the numerical solution of the raindrop motion velocity:

[0046]

[0047] (5) Substituting the initial value condition in the discrete equation in the step (4), when t=0, satisfy following condition: z=h, u a = u R , v a =v R ,w T =w R ;

...

Embodiment 2

[0053] In this embodiment, the calculation method of the rainfall-induced sea surface stress value is the same as that of Embodiment 1: that is, the scheme provided in Embodiment 1 is used to calculate the rainfall-induced sea surface stress value through TRMM and ERA5 data;

[0054] Such as Figure 4 As shown, this embodiment also provides the global distribution of the ratio of rainfall-induced sea surface stress to wind stress. The ratio of rainfall-induced sea surface stress to wind stress is calculated according to the following formula:

[0055]

[0056] Among them, ρ a is the atmospheric density, C d is the sea surface drag coefficient, u 10 is the wind speed at a height of 10 meters.

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Abstract

The invention belongs to the technical field of marine environment numerical simulation and ocean forecasting, and can also be applied to disaster risk assessment in the field of marine engineering, and specifically relates to a calculation method for rainfall-induced sea surface stress; the method considers atmospheric stratification, wind speed, sea surface roughness, Based on various factors such as rainfall rate and particle size distribution of raindrops, the three-dimensional motion equation of raindrops in the atmospheric turbulent boundary layer is established, and the numerical solution of sea surface stress caused by rainfall is obtained through numerical integration. The evaluation has important reference value and has important scientific and practical significance; meanwhile, the method provided by the invention can be used as a physical process option of the earth system model to realize the parameterization of the grid physical process of rainfall to ocean energy transmission, for Scientific research provides evidence to deepen the knowledge and understanding of the momentum exchange process between gas interfaces.

Description

technical field [0001] The invention belongs to the technical field of marine environment numerical simulation and ocean forecasting, and can also be applied to disaster risk assessment in the field of marine engineering, and in particular relates to a calculation method of rainfall-induced sea surface stress. Background technique [0002] As an important physical process in the atmosphere, rainfall has a very important impact on global-scale atmospheric circulation, water cycle and local weather. However, the understanding of the impact of rainfall on ocean momentum flux is still not clear enough. [0003] On the one hand, in the fields of ocean numerical forecasting and earth system modeling, wind energy is the main source of mechanical energy for the ocean. In the field of forecasting and earth system models, basically all open-source ocean circulation models (except ROMS) do not consider the rainfall-induced sea surface stress term. In the ROMS model, the rainfall-induc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F111/10G06F119/14
CPCG06F30/28G06F2111/10G06F2119/14
Inventor 赵彪王关锁尹训强乔方利
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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