Method for determining strong wind generating mechanism in complicated terrain area

Abstract

The invention relates to a method for determining a strong wind generating mechanism in a complicated terrain area. The method for determining the strong wind generating mechanism in the complicated terrain area synthesizes the dynamic and thermal processes on the surface of a complicated underlying surface, analyzes the causes of strong winds in the complicated terrain and the changes in different seasons, and uses a mesoscale weather forecast mode WRF to quantitatively determine the background process of large-scale atmospheric circulation, so as to obtain the formation and evolution mechanisms of near-surface winds through comparative analysis. The method for determining the strong wind generating mechanism in the complicated terrain area designed a series of sensitivity tests for complicated underlying surface terrain, vegetation, soil moisture and other parameters to quantitatively obtain the influence of different factors on the wind generating process under different underlyingsurface conditions and the stress effect subjected to the large-scale circulation, so as to obtain the formation mechanism of the strong wind in the complicated terrain area and the causes and influence factors of wind disasters in power grids. The method for determining the strong wind generating mechanism in the complicated terrain area can provide reference data for power grid deployment, windenergy resource utilization, wind disaster prediction and assessment and the like in the complicated terrain area. The method for determining the strong wind generating mechanism in the complicated terrain area can improve the disaster prevention and mitigation of wind power system and the utilization of wind energy resources, and can make breakthroughs in the disaster generation mechanism and disaster warning of transmission line wind disasters.

Description

technical field [0001] The invention relates to the field of disaster prevention and mitigation, in particular to a method for measuring the mechanism of strong winds in complex terrain areas. Background technique [0002] The wind field of mountainous terrain is different from the wind field of flat landform conditions. The complex terrain of mountainous areas will significantly change the distribution of near-surface flow wind speed in the vertical direction and the turbulence structure, thus forming the unique wind field structure characteristics of mountainous terrain, such as the mountainous wind. , canyon wind, etc. When the air flow passes through the mountain peak, due to being blocked by the mountain peak, the air flow will flow around the top and sides of the mountain peak, and the air flow will be accelerated. When the airflow enters the canyon from a flat and open landform, the speed of the airflow will increase due to the reduction of the area of ​​the flow s...

AI Technical Summary

Problems solved by technology

In the current domestic and foreign codes, most of the regulations on the characteristics of mountain wind fields are relatively simple. Generally, the wind field environment in mountains is considered by using the wind speed increase coefficient. The wind speed profile data on the windward side and the leeward side did not consider the data in the three-dimensional situation of the entire mountain, and there is also a lack of data specifically for the "canyon wind effect" formed by the two mountains

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