Method for improving accuracy rate of meteorological environment numerical simulation

Abstract

The invention discloses a method for improving the accuracy rate of meteorological environment numerical simulation. The method comprises the following steps of: enabling the turbulent flux calculated by using the roughness and the effective null plane displacement in a meteorological environment numerical model net region to be equal to the sum of the turbulent fluxes calculated by using each underlying surface earth service type in the numerical model net region, obtaining a formula (11); enabling the total air mass calculated by using the roughness and the effective null plane displacement in the numerical model net region to be equal to the weighted sum of the air mass calculated by using each underlying surface earth service type in the numerical model net region, obtaining a formula (12), and obtaining an original functional form (13) from the formula (12) by integration; resolving the effective roughness and the effective null plane displacement of the non-uniform earth surface in the numerical model net region, importing an atmosphere initial field and a lateral boundary forcing field into the meteorological environment numerical model, and then, importing the sum into the numerical model to get the numerical simulation result. The method improves the accuracy rate of meteorological environment numerical simulation, and can be used in environmental assessment and wind power utilization.

Description

technical field [0001] The invention relates to a method for improving the calculation accuracy of the ground-air flux on an underlying surface under a meteorological environment numerical model, in particular to a method for improving the accuracy of the meteorological environment numerical simulation. Background technique [0002] The numerical model of the meteorological environment needs to give effective aerodynamic parameters such as the effective roughness of the underlying surface and the effective zero-plane displacement. Since the resolution of the numerical model cannot be increased without limit, each model grid may include a variety of surface type, and each model grid can only select one value for each aerodynamic parameter, that is, the effective aerodynamic parameters that can comprehensively consider different types of effects, that is, effective roughness and effective zero plane displacement. [0003] Internationally, since the 1980s, due to the need to co...

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Problems solved by technology

These methods basically design the effective roughness calculation method based on the geometric characteristics of the underlying surface, and fail to consider the dynamic constraints of the atmospheric boundary layer used in the calculation of the exchange between the ground and the air by the meteorological numerical model, and the effective zero plane There is no reasonable method for the calculation of the displacement, and the weighted average method can only be used for calculation directly. There is no dynamic connection between the obtained effective roughness and the effective zero plane displacement, and the conservation of physical quantities in the calculation of the earth-air interaction cannot be accurately considered. sexual bondage

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