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A method for determining the mechanism of strong winds in complex terrain areas

A technology for complex terrain and strong winds, which is applied in the field of determining the mechanism of strong winds in complex terrain areas, which can solve the problems of lack of canyon wind effects and data that are not considered, and achieve a good representative effect of strong wind seasons.

Active Publication Date: 2021-01-26
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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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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  • A method for determining the mechanism of strong winds in complex terrain areas
  • A method for determining the mechanism of strong winds in complex terrain areas
  • A method for determining the mechanism of strong winds in complex terrain areas

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Embodiment Construction

[0036]The present invention takes the Dali region of the Yunnan-Guizhou Plateau as an example to illustrate the mechanism of the cause of gale in a complex terrain area.

[0037]Dali Prefecture is located at the junction of Yunnan-Guizhou High Source and Hengduan Mountains. The terrain is high in the northwest and low in the southeast. The landforms are complex and diverse, and the west of Diancang Mountain is a high mountain valley area. To the east of Diancang Mountain and to the west of Xiangyun is the steep slope terrain of Zhongshan. The mountains in the territory mainly belong to the Yunling Mountains and Nushan Mountains. The Diancang Mountain is located in the middle of the Dali Realm, and it is as tall and tall as an arch. The Xueban Mountain at the junction of Jianchuan and Lanping in Lijiang in the north is the highest peak of the mountains in Dali, with an elevation of 4295 meters. The lowest point is Hongqiba on the Nu River in Yunlong County, 730 meters above sea level. T...

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Abstract

The invention relates to a method for measuring the mechanism of strong winds in complex terrain areas. This method integrates the surface dynamics and thermal processes of complex underlying surfaces, analyzes the causes of strong winds in complex terrain and its seasonal variation characteristics, uses the mesoscale weather forecast model WRF to quantitatively measure the background process of large-scale atmospheric circulation, and compares and analyzes the near-surface wind mechanism of formation and evolution. By designing a series of sensitivity tests on complex underlying surface topography, vegetation, soil moisture and other parameters, this method quantitatively obtains the influence of different underlying surface conditions and factors on the wind process and the stress of large-scale circulation. The formation mechanism of strong winds in complex terrain areas and the causes and influencing factors of wind disasters in power grids are obtained. It can provide reference data for power grid layout, wind energy resource utilization, wind disaster prediction and assessment in complex terrain areas. It can improve the disaster prevention and mitigation of wind power systems and the utilization of wind energy resources, and has made breakthroughs in the mechanism of wind disasters on transmission lines and early warning of disasters.

Description

Technical field[0001]The invention relates to the field of disaster prevention and mitigation, in particular to a method for determining the gale mechanism in a complex terrain area.Background technique[0002]The wind field of mountainous terrain is different from the wind field of flat terrain. The complex terrain of mountainous area will significantly change the vertical distribution of wind speed and turbulence structure of near-surface flow, thus forming the unique wind field structure characteristics of mountainous terrain, such as mountain wind , Canyon Wind, etc. When the air flows through the mountain peak, the air flow will circulate from the top and both sides of the mountain, and the air flow is accelerated. When the airflow enters the canyon from the flat and open landform, the speed of the airflow will increase due to the reduction in the area of ​​the cross-flow section, forming the "narrow tube effect" of the canyon wind field.[0003]As the demand for power transmission...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/02
CPCG01W1/02Y02A90/10
Inventor 陈昊王婵孟宪红吕世华赵林李照国奥银焕杨文
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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