摘要
【目的】探明新月形沙丘的动态变化及其与气象因子之间的相互关系,为防沙治沙提供理论依据.【方法】在河西绿洲边缘选取了7个典型的样点,用Goolge Earth对各个样点沙丘的形态参数进行测量,并将所得数据与气象要素之间进行相关性分析.【结果】受风速、大风日数等因子的影响,民勤地区沙丘移动最快,移动速度为6.2m/a,受主风向等因子的影响,敦煌地区沙丘移动最慢,移动速度为0.8m/a;受不同气象要素的影响,与2006年相比,河西大多数地区的沙丘迎风坡水平长增加,背风坡水平长减小;影响沙丘动态变化的3个主因子为年降水量、年平均风速、年大风日数,其中年降水量在气象因子中的贡献率最大.【结论】气象因子对沙丘动态变化的影响既有正向作用,也有逆向作用.
【Objective】In order to explore the dynamic changes of the Barchan Dunes and its relationship with meteorological factors,to provide a theoretical basis for prevent and control desertification.【Method】Seven typical sample areas were selected at the oasis fringe of Hexi Corridor.Use the Goolge Earth to measure the morphological parameters of the Barchan Dunes at every sample areas.The correlation was analyzed between the data and climate factors.【Result】The fastest dunes movement speed was found at 6.2 m/a in Minqin area,affected by the wind speed,annual strong wind days and other factors.The sand dunes moved the slowest in Dunhuang area,the movement speed was at 0.8 m/a,affected by the main wind direction and other factors.Most of the windward slope length increased and the leeward slope length decreased when compared with 2006 in Hexi Corridor,affected by different meteorological factors.The three main factors that affected the dune dynamic were annual precipitation,annual average windspeed,annual strong wind days.The annual precipitation had the largest contribution rate in all meteorological factors.【Conclusion】The meteorological factors have both positive and adverse effects on dynamic changes of Barchan Dunes.
引文
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