研究了山东、江苏、河南等区域平坦地形风剪切的特性,包括风切变指数随高度的变化、日内变化以及月变化特性。通过分析150 m高度测风塔完整年的数据,发现不同区域风切变指数随高度呈现不同的变化特性,即：最高层风切变指数最小,100~150 m高度风切变指数变化平缓,次高层约130 m风切变指数减小、风切变指数随高度呈现波动的特性。风切变指数的日内变化呈中午前后较小、夜间及凌晨较大的特点,且该规律在100 m高度以下尤其显著。风切变指数的月变化在100 m高度以上无规律性,在100 m高度以下呈平缓增加和波动的特性。
Abstract
This paper studies the characteristics of wind shear in flat terrain over Shandong, Jiangsu and Henan, which include the tendency of wind shear exponent varying with heights, hours and months. By analyzing measured data of several towers up to the height of 150 m, it is found that the wind shear exponent varies at different areas, and exposes different characteristics. Namely, the wind shear exponent is minimum at the height of 150 m, changes gently between the heights of 100 m and 150 m, and drops sharply at the height of 130 m. In terms of hourly variation, the wind shear exponent maintains at a relatively low value at the daytime, while it increases to a high value at night and nearly morning, and this tendency is especially evident at the height below 100 m. Furthermore, the wind shear exponent above 100 m varies disorderly with the months, but below 100 m it presents a gradual and fluctuationg increose.
关键词
风切变 /
风能 /
风资源评估 /
大气热稳定度
Key words
wind shear /
wind energy /
wind resource assessment /
atmospheric stability
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