Aeolian processes on sandy desertification of an alpine meadow: A wind tunnel experiment

作者：ZhiShan An,KeCun Zhang,LiHai Tan,BaiCheng Niu,YanPing Yu

摘要：In recent years,the desertification of alpine meadows has become a serious ecological problem and has gradually become a threat to regional economic activities in Maqu County.To reveal the mechanism for sandy desertification of alpine meadows,we conducted wind tunnel experiments on aeolian processes over sandy alpine meadows.Results show that the sandflux profile of mix-sized sediment decays exponentially with increasing height.However,the profile pattern of a group of uniform-sized particles depends on the experimental wind speeds.The profile pattern of all the groups studied can be expressed by exponential decay functions when the wind speed is less than or equal to 16 m/s.while that for all the groups studied can be expressed by a Gaussian distribution function when the wind speed is above 16 m/s.The average saltation heights of mixed sands at wind speeds of 12 m/s,16 m/s,20 m/s,and 24 m/s were 2.74,4.19,5.28,and 6.12 cm,respectively.The mean grain size basically first decreases and then increases with increasing height under different wind speeds.The sorting improves with increasing wind speed,while the kurtosis and skewness show relationships with only the characteristics of the parent soil.

发文机构：Northwest Institute of Eco-Environment and Resources Dunhuang Gobi and Desert Research Station Key Laboratory of Desert and Desertification University of Chinese Academy of Sciences

关键词：ALPINEMEADOWSANDYDESERTIFICATIONaeolianEROSIONaeolianTRANSPORT

分类号： F83[经济管理—金融学]