柞水地区冬季低空风场分析

Analysis on the Low-level Winter Wind Field in Zhashui

根据2005年1月20日至2月4日在柞水地区进行的大气边界层探测试验得到的资料,分析了该地区的低空风场随高度的垂直分布特征以及随时间的演变特征。结果表明:柞水地区冬季低空盛行风向随高度的变化明显,从地面到150 m高度内,盛行风从偏西北风逐渐转为偏东南风。而在150 m高度以上的大气层均为盛行偏东风或偏东南风。冬季低空平均风速随高度变化,在地面到100 m高度层风速随高度的增加变化较快,而在100 m以上的风速随高度的变化较小。风速随时间的分布,在11:00至14:00左右整层大气存在一个风速相对较小的区域,随后风速开始增大。在17:00至20:00左右整层大气存在一个风速相对较大的区域,在17:00 600 m高度左右风速达到最大,为2.3 m/s。

According to the atmospheric boundary layer data of Zhashui from January 20 to February 4,2005,the vertical and temporal variation of the low-level wind field in this area was analyzed.As indicated by the results,the low-level prevailing wind in Zhashui varied largely in vertical direction,the prevailing wind shifted from the northwest to southeast from the ground to 150 m height,while the easterly wind and southeast wind were prevailing above the height of 150 m.The average speed of low-level winter wind increased with the raising altitude,the increase rate was fast from the ground to the height of 100 m while the rate became small above 100 m.The wind speed was relatively small during 11：00 to 14：00,and began to increase thereafter,it reached the maximum of 2.3 m/s at 17：00 at the height of 600 m.