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### 辽宁省近地层风切变特征研究

1. 1. 沈阳区域气候中心,沈阳 110166;
2. 中国气象局 沈阳大气环境研究所,沈阳 110166
• 收稿日期:2014-09-01 修回日期:2015-02-28 出版日期:2015-09-15 发布日期:2015-09-15
• 作者简介:龚强（1974- ）,女,辽宁沈阳人,正研级高工,硕士,主要从事气象能源开发利用、工程气象和气候变化领域的研究工作。E-mail: isgq@sina.com
• 基金资助:

国家自然科学基金资助项目（41240034）; 公益性行业（气象）科研专项（GYHY201306050,GYHY201306034）; 辽宁省风能资源详查和评价项目; 中国气象局气候可行性论证关键技术创新团队及“分散式风电接入技术及工程示范”项目

### Study on the Near SurfaceWind Shear Characteristics in Liaoning Province

GONG Qiang1, WANG Hong-yu2, ZHU Ling1, LIN Na1, GU Zheng-qiang1, CHAO Hua1, XU Hong1

1. 1 .Climatic center of Shenyang area, Shenyang 110166, China;
2. Institute of Atmospheric environment, CMA, Shenyang 110166, China
• Received:2014-09-01 Revised:2015-02-28 Online:2015-09-15 Published:2015-09-15

Abstract:

The near surface wind shear characteristics were analyzed using 10 m to 70 m (100 m) hourly gradient wind observation data of 26 wind towers from June 2009 to May 2010. The results are as follows. The variation of wind speed with height accords with exponential function. The yearly wind shear indices at different wind tower vary remarkably from 0.0244 to 0.4050, with no obvious spatial characteristics, which is affected by local terrain and physiognomy. The wind shear indexes at 11 wind towers are more than 0.15 (standard B，came from GB 50009-2012) and 0.143（reference value came from GB/T 18710-2002）. The spatial average yearly wind shear index of 26 wind towers is 0.1551, which is also a little more than standard B and 0.143 (reference value came from GB/T 18710-2002). So it needs to pay attention when quoting the reference values directly in the wind engineering if there is no local observation. The obvious daily variations of wind shear index show that large wind shear index occurs before sunrise and after sunset, and it gradually drops with the increase of near surface temperature. The wind shear index is the lowest in spring comparing with other seasons. The wind shear index under neutral atmospheric condition approaches to the yearly average wind shear index, and it is higher under stable condition and lower under unstable condition. The average wind shear index decreases with the increase of wind speed, which is lower than the yearly average wind shear index under strong wind condition. For a great number of wind towers, the wind shear index is less than 0.1 when wind speed is more than ≥15 m/s.

• P425