Statistical Characteristics of the Low － level Vertical Shear and Turbulence in Gale Days During 2009 －2010 in Hexi Corridor

doi:10． 11755/j． issn． 1006 －7639(2014) －02 －0270

Journal of Arid Meteorology

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Statistical Characteristics of the Low － level Vertical Shear and Turbulence in Gale Days During 2009 －2010 in Hexi Corridor

DONG Anxiang¹，CAI Zhonglan²，FANG Feng³，XIANG Jun²，YANG Suhua³

1． Institute of Arid Meteorology of CMA，Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province，Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA，Lanzhou 730020，China;
2． Meteorological Service Center of Gansu Province，Lanzhou 730020，China;
3． Climate Center of the Northwest Region，Lanzhou 730020，China

Online:2014-04-18 Published:2014-04-18

2009 ～2010 年河西走廊大风日低空垂直切变和湍流统计特征

董安祥¹，蔡忠兰²，方锋³，向军²，杨苏华³

1．中国气象局兰州干旱气象研究所，甘肃省干旱气候变化与减灾重点实验室，中国气象局干旱气候变化与减灾重点开放实验室，甘肃兰州 730020;
2．甘肃省气象服务中心，甘肃兰州 730020;
3．西北区域气候中心，甘肃兰州 730020

作者简介:董安祥(1944 － )，男，江苏南京市人，研究员，主要从事气候变化研究． E － mail: dax －2364@163． com
基金资助:
中国电力工程顾问集团公司技术成果“西北特殊地域大风特性及线路设计研究(DG1 － D03 －2011)”、国家发改委专项“甘肃应对气候变化规划思路研究(1213042)”、“西北半干旱区重大干旱事件的成因与机理及其预测技术研究(1209)”共同资助

Abstract

Abstract:

In order to provide the scientific basis for wind power plants construction of Hexi Corridor，the distribution and evolution of
the vertical shears and turbulences of low － level in gale days were analyzed by using the wind speed data from 14 observation towers
from September 2009 to August 2010． The results showed that annual mean vertical shear indexes of wind speed in gale days during
2009 －2010 were from 0． 092 to 0． 158 in Hexi Corridor，which was less than that of the national standard with 0． 143． The vertical
shear indexes of low － level wind speed over the heights of 10 －30，10 －50 and 10 －70 meters in gale days were smaller than those in
non － gale days． The vertical shear of low － level wind speed was big，while that of the upper － level wind speed was small． The annual
mean turbulence intensity over 10，30，50 and 100 meters was 0． 11 during 2009 －2010 in gale days，and was about half in non － gale
days． Furthermore，the non － uniformity of wind speed reduced as the wind speed increased in gale days，and the wind directions ten-
ded to steady．

Key words: Hexi Corridor, gale days, low － level, vertical shear, turbulence

摘要：

为了给河西走廊风电场建设提供科学依据，利用河西走廊 14 座风能观测塔 2009 年 9 月至2010 年 8 月的资料，分析了大风日低空垂直切变和湍流的演变和分布。结果表明: 大风日风速垂直切变指数年平均在 0． 092 ～0． 158 之间，较国标有些偏低;10 ～30 m、10 ～50 m 和 10 ～70 m 的大风日风速垂直切变指数比非大风日偏小;低层风速垂直切变大，高层风速垂直切变小;大风日 10 m、30 m、50 m 和 100 m 4 层的年平均湍流强度为 0． 11，比非大风日偏小一半左右;在大风日，随风速增大，风速不均一性减小，风向趋于稳定。

关键词: 河西走廊, 大风日, 低空, 垂直切变, 湍流

CLC Number:

P425． 1

DONG Anxiang，CAI Zhonglan，FANG Feng，XIANG Jun，YANG Suhua. Statistical Characteristics of the Low － level Vertical Shear and Turbulence in Gale Days During 2009 －2010 in Hexi Corridor[J]. Journal of Arid Meteorology, DOI: 10． 11755/j． issn． 1006 －7639(2014) －02 －0270.

董安祥，蔡忠兰，方锋，向军，杨苏华. 2009 ～2010 年河西走廊大风日低空垂直切变和湍流统计特征[J]. 干旱气象, DOI: 10． 11755/j． issn． 1006 －7639(2014) －02 －0270.

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Statistical Characteristics of the Low － level Vertical Shear and Turbulence in Gale Days During 2009 －2010 in Hexi Corridor

2009 ～2010 年河西走廊大风日低空垂直切变和湍流统计特征

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