敦煌鸣沙山-月牙泉近地表风沙输移路径及强度  

Near-surface Aeolian Sand Paths and Intensity around the Crescent Moon Spring,Dunhuang,China

作　　者：张克存[1] 屈建军[1] 牛清河[1] 安志山[1] 井哲帆[1] 张伟民[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所敦煌戈壁荒漠生态与环境研究站/沙漠与沙漠化重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2015年第3期521-525,共5页Journal of Desert Research

基　　金：国家自然科学基金项目(41371027;41271023);中国科学院"西部之光"项目(29Y128841)

摘　　要：利用鸣沙山-月牙泉景区多点同步风况和输沙通量资料,探讨了近地表流场特征、风沙活动强度及输移路径;基于1985和2009年两期遥感影像,揭示高大沙山动态变化及其对月牙泉的影响。月牙泉主要受南北沙山夹击,尤其是北沙山南移更为突出,直接威胁月牙泉存在。近年来,受地形、周边建筑物和外围树木的影响,月牙泉景区近地表流场改变,导致区域输沙动态平衡破坏。因此,月牙泉风沙防治应从恢复近地表风沙流场角度考虑,遵循风沙动态平衡原则,打通月牙泉景区东风通道,恢复均衡环流结构,这是维系高大沙山与月牙泉共存的关键。By use of the synchronous wind data and sand transport data in the scenic spots of Crescent Moon Spring,the local circulation,and the intensity of wind-blown sand and aeolian sand paths were investigated.In addition,the dynamical change of mega-dunes and their effects on the Crescent Moon Spring was exposed based on the remote sensing images in 1985 and 2009.Due to the unique location,the pyramidal dune to the north of the Crescent Moon Spring moves towards the Crescent Moon Spring obviously.A raised sand ridge was formed on the mid-parts of the pyramidal dune because of the reduced wind from the east.According to the flow field of wind-blown sand,to open the channel of the easterly wind and restore the equilibrium circulation patterns is the key to prevent the Crescent Moon Spring from sand buries.

关 键 词：月牙泉 近地表流场 输沙通量 沙山 

分 类 号：P931.3[天文地球—自然地理学]