晋北沙漠化地区起沙风风况与输沙势

利用10个气象站点2001、2005、2010，2014年风速数据，计算并分析了晋北沙漠化地区起沙风风况及输沙势时空变化。结果表明：研究区年均起沙风频率和起沙风平均风速均为春季最大，冬季次之，夏季最小，各季节和全年年际变化均表现为大致减小趋势；输沙势显示研究区春季处于中风能环境，是最主要的风沙活动期，其他季节和全年整体上均处于低风能环境；春季风能环境总体呈减弱趋势，这可能是导致研究区2000年以来沙漠化逆转的重要因素之一；受地势影响，研究区春季风能环境呈北高南低、东高西低趋势，最高值位于东北部的大同盆地。

Sand-driving Wind Regime and Drift Potential in the Sandy Desertification Area of Northern Shanxi,China

Based on the annual wind data collected from the ten meteorological stations in 2001, 2005, 2010, and 2014, the temporal and spatial variations of sand-driving wind regime and drift potential in the sandy desertification area of northern Shanxi were analyzed in this paper. The results indicated that the frequency and mean velocity of sand-driving wind were both largest in spring, followed by winter, and were both smallest in summer, and both presented decreased trends in each season and the full year since 2001; the wind energy environment was medium in spring and was low in other seasons and the full year, and spring is the period with strongest wind blown activity; the wind energy environment in spring presented weakening trend since 2001, which may be the one of the reasons of sandy desertification reversed in the study area since this century; the wind energy environment in spring was higher in the north and east than in the south and west in the study area due to the effect of topography, and the highest values located in the Datong Basin of the northeastern study area.