库姆塔格沙漠东缘荒漠绿洲过渡带风况及输沙势

Wind regime and resultant sand-transporting potential in the desert-oasis ecotone in the eastern marginal zone of the Kumtag Desert

以国家林业局库姆塔格荒漠生态系统定位研究站2012-2013年的气象资料为依据,分析了库姆塔格沙漠东缘荒漠-绿洲过渡带的风况特征和输沙势变化情况。结果表明:1)研究区主要受WNW-NW和ENE-NE两组风向起沙风控制,其中主风向为WNW-NW,占全年起沙风的35.15%,次风向为ENE-NE,占全年起沙风的24.80%;2)该区起沙风主要发生在春季和夏季,占全年起沙风的72.59%,春季起沙风主风向为ENE,其他季节起沙风的主风向为WNW方向。3)在风沙活动期内,年合成输沙势(RDP)为54.73VU,合成输沙势方向(DDR)为S189°,研究区属于低风能环境。研究区输沙势的大小具有明显的季节性,其中春季和夏季具有较高的总输沙势(DP)和合成输沙势(DDR)。

The desert- oasis ecotone in the eastern marginal zone of the Kumtag Desert is one of the areas with the severest desertification in China. In this study a statistical analysis on wind regime and resultant sand- transporting potential from 2012 to 2013 in the eastern marginal zone of the Kumtag Desert was carried out. The results showed that：（ 1） This region was affected predominantly by WNW- NW 和 ENE- NE wind directions,there was a higher accumulated frequency with 35. 15% in the WNW- NW direction,and the frequency of sand-moving wind in the ENE- NE was 24. 8%;（ 2） Sand- moving wind in the study area occurred mainly in the spring and summer,its occurring frequency was 72. 59%,the prevailing wind in spring was ENE,and WNW in other seasons;（ 3） During the phase of wind- sand activity,resultant sand- transporting potential（ RDP） was54. 73 VU,resultant sand- transporting directon（ RDD） was 189°S. There was a higher sand- transporting potential（ RDP） and drift potential（ DP） in the spring and summer.