新疆博斯腾湖流域风沙环境特征

Wind Regime Characteristics of the Bosten Lake Basin in Xinjiang,China

通过风资料的统计和计算,对博斯腾湖流域风沙活动强度环境特征进行了系统的研究。结果表明:博斯腾湖流域年平均风速较小,一般1.6~3.0m·s-1;有效起沙风作用时间存在明显的区域差异,其中巴音布鲁克起沙风天数占全年总天数的55.59%,焉耆、轮台、巴音郭楞及和静分别为18.75%、12.72%、11.48%、11.23%,其余各站均低于10%;随着风速等级的增加,起沙风出现的频率相应减少,基本上都集中在6.1~10.0m·s-1;研究区方向变率指数(合成输沙势/输沙势,RDP/DP)0.49~0.68,属于中比率,风况特征属于纯双峰风况或锐双峰风况。输沙势属于低风能环境,且存在较大的区域差异。

By statistics and calculation of the wind data,systematic research is made on the characteristics of wind regime in the Bosten Lake basin.The annual average wind speed is rather small,generally,it is 1.6-3.0m·s-1;the effective time of sand-driving wind when the wind speed is more than or equals to 6.0 m·s-1 is obviously different in various regions.Among them,the days of sand-driving wind in Bayinbuluk account for55.59% of the total number of days,in Yanqi,Luntai,Hejing,it is 18.75%,12.72%,11.48%,12.72%respectively,in the rest of the stations it is lower than10%.As the wind speed scale increases,the frequency of sand-driving wind reduces,and it is mostly concentrated 6.1-10.0 m·s-1;Wind variability index is between0.49 to 0.68 in research region,and it belongs to middle ratio,the characteristics of wind conditions belong to blunt bimodal or sharp bimodal;sand-transporting potential belongs to low wind energy environment,and there are huge regional differences.