JOURNAL OF GEOPYSICAL RESEARCH ,VOL 111 XXXXXX,DOI:10.1029/2005 JD006630
Anaylsis of the mass flux profiles of an Aeolian saltating cloud ZHIBAO Dong Guangqiang Qian ,Wanyin luo ,1and Hongtao wang1,Received 28 August 2005;revised 2 April 2006;accepted 26 April 2006;pulished XX Month 2006.
Aeolian researchers have recognized the importance of measuring the height profile of Aeolian saltating flux and devoted a lot of effort to reliable measurement .In this paper ,the height profiles of Aeolian saltation flux are reconstructed on the basis of the profiles of mean particle velocity and relative particle concentration obtained by particle image velocimetry ,a nonintrusive technique ,in a wind trnnel .The results suggest that the mean particle velocity increases with an increase in win velocity and height but decreases with an increase in particle size ,The height profile of mean particle velocity can be expressed by a power function essentially in agreement with previous studies Particle concentration decays exponentially with the square root of height rather than height itself as proposed in most previous studies .Mass flux profiles are derived by multiplying the mean particle velocity and concentration profiles .
The reconstructed mass flux profiles are characterized by three sections In the near-surface layer ,mass flux ,increases with an increase in wind velocity but deceases with an increase in particle size ,The reconstructed mass profiles are essentially in reasonably good agreement with those measured by segmented sampler in a wind tunnel .Two significant parameters , average saltation height and relative decay factor are proposed to characterize variation particles can reach higher levels as wind velocity increases and particle size decreases and that mass flux decays more rapidly as wind velocity decreases and particle size increases.
Citation:Dong ,Z,G,Qian,W,luo ,and H Wang (2006)Analysis of the mass flux profiles of an Aeolian saltating cloud ,J Geophys ,Res ,111,XXXXXX, doi:10 1029/2005JD006630.