| 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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| 引用本文： | 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].甘肃气象,2014(2):270-274. |
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| 作者姓名： | 董安祥 ;蔡忠兰 ;方锋 ;向军 ;杨苏华 |
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| 作者单位： | [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 |
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| 基金项目： | 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 |
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| 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.
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| 关 键 词： | 河西走廊 大风日 低空 垂直切变 湍流 |
Statistical Characteristics of the Low - level Vertical Shear and Turbulence in Gale Days During 2009 -2010 in Hexi Corridor |
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| Institution: | DONG Anxiang,CAI Zhonglan,FANG Feng,XIANG Jun,YANG Suhua(1. Institute of Arid Meteorology of CMA,Key Laboratory of Arid Climatic Change andReducing Disaster of Gansu Province,Key Open Laboratory of Arid Climatic Change and DisasterReduction 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) |
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| Abstract: | In order to provide the scientific basis for wind power plants construction of Hexi Corridor,the distribution and evolution ofthe vertical shears and turbulences of low - level in gale days were analyzed by using the wind speed data from 14 observation towersfrom September 2009 to August 2010. The results showed that annual mean vertical shear indexes of wind speed in gale days during2009 -2010 were from 0. 092 to 0. 158 in Hexi Corridor,which was less than that of the national standard with 0. 143. The verticalshear 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 innon - gale days. The vertical shear of low - level wind speed was big,while that of the upper - level wind speed was small. The annualmean turbulence intensity over 10,30,50 and 100 meters was 0. 11 during 2009 -2010 in gale days,and was about half in non - galedays. Furthermore,the non - uniformity of wind speed reduced as the wind speed increased in gale days,and the wind directions ten- ded to steady. |
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| Keywords: | Hexi Corridor gale days low-level vertical shear turbulence |
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