【作者】 梅凡民； 张小曳； 张承中； 王亚强；

【Author】 MEI Fan-min, ZHANG Xiao-ye, ZHANG Cheng-zhong, WANG Ya-qiang( State key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences. Xi ’An, Shanxi 710075, China; School of Environmental &Chemical Engineering, Xi ’an University ofEngineer Science & Technology, Xi ’An, Shanxi 710078, China: 3. School of Environmental & Municipal Engineering, Xi ’an University of Architecture & Technology, Xi ’An, Shanxi 710055, China)

【机构】 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室； 西安建筑科技大学环境与市政工程学院；

【摘要】 起动摩阻风速是模拟表土风蚀和粉尘释放的重要临界参数.根据地表覆盖类型、植被平均的高度和覆盖度、砾石平均高度和覆盖度以及表土微团粒粒度分布特征,利用Marticorena的起动摩阻风速模式模拟了巴丹吉林沙漠不同地表覆盖类型的平均起动摩阻风速.模拟结果显示:裸露流动沙丘平均起动摩阻风速为20.43 cm/s,稀疏植被覆盖沙丘和砂砾质戈壁在60-80 cm/s之间,预示着裸露流动沙丘是粉尘释放主要源区.更多还原

【Abstract】 The threshold wind friction velocity of surface soil is a critical parameter for modeling dust emission by wind erosion. The mean threshold wind friction velocities of surface soils with various land cover types in Badain Juran Desert, China were modeled by Marticorena’s formula through inputting the parameters of the mean heights and cover rates of the roughness elements, such as, various vegetation types and gravels, and the parameters of micro-aggregate size distributions of surface soil types. It indicates that the mean threshold wind friction velocity of bare dune sand is 20.43 cm/s, and the mean values of dune sand and gravel sand with different land cover types range from 60-80 cm/s, which implies that bare sand dune is likely to be a major dust source.更多还原