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

作     者：ZHANG KeCun QU JianJun ZU RuiPing FANG HaiYan 

作者机构：Key Laboratory of Desert and DesertificationCold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2007年第50卷第2期

页      面：247-253页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

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

主　　题：underlying surface sand flow pulsation of wind speed 

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.