Pulsatory characteristics of wind velocity in sand flow over typical underlying surfaces  

作　　者：ZHANG KeCun QU JianJun ZU RuiPing FANG HaiYan 

机构地区：[1]Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Science China Earth Sciences》2007年第2期247-253,共7页中国科学（地球科学英文版）

基　　金：Supported by the National Key Basic Research Project (Grant No. G1999043504) ;the National Science and Technology Key Task Project (Grant No. 2002BA517A11)

摘　　要：Pulsatory characteristics of wind velocity in sand flow over Gobi and mobile sand surface have been investigated experimentally in the wind tunnel. The primary goal of this paper is to reveal the relation- ship between pulsatory characteristics of instantaneous wind speed in sand flow and the motion state of sand grains. For a given underlying surface, pulsation of wind velocities in sand flow on different heights has a good correlation. As the space distance among different heights increases, fluctuation of instantaneous wind speed presents a decreasing trend and its amplitude is closely related to the mo- tion state of sand grains and their transport. Pulsatory intensity increases with the indicated wind speed, but its relative value does not depend on it, only agrees with height.Pulsatory characteristics of wind velocity in sand flow over Gobi and mobile sand surface have been investigated experimentally in the wind tunnel. The primary goal of this paper is to reveal the relationship between pulsatory characteristics of instantaneous wind speed in sand flow and the motion state of sand grains. For a given underlying surface, pulsation of wind velocities in sand flow on different heights has a good correlation. As the space distance among different heights increases, fluctuation of instantaneous wind speed presents a decreasing trend and its amplitude is closely related to the motion state of sand grains and their transport. Pulsatory intensity increases with the indicated wind speed, but its relative value does not depend on it, only agrees with height.

关 键 词：UNDERLYING surface SAND FLOW PULSATION of WIND speed 

分 类 号：P425.55[天文地球—大气科学及气象学]