Multi-size saltation for different soil moisture conditions at a gobi site in the Taklimakan Desert, China

Details Multi-size saltation for different soil moisture conditions at a gobi site in the Taklimakan Desert, China Multi-size saltation for different soil moisture conditions at a gobi site in the Taklimakan Desert, China

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p22b..04i&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P22B-04

Physics

0305 Aerosols And Particles (0345, 4801, 4906), 0394 Instruments And Techniques, 1866 Soil Moisture, 3307 Boundary Layer Processes, 5415 Erosion And Weathering

Scientific paper

Sand Particle Counter (SPC) was newly developed to measure saltation process for particle size {d} from 38 to 667 um with 32 bins every seconds. We set this instrument at a gobi site in the southern part of the Taklimakan Desert, China in Spring in 2002 and 2003, as a part of ADEC experiment. Simultaneously, we measured soil water content using oven dry method and Time Domain Reflectometry (TDR) sensors. From this result, it is found that The threshold wind speed u_t(θ) for wet conditions (θ = 0.009 m3m-3) was estimated to be 9.5 ms-1 at 3.8 m height and was 1.27 times larger than that for dry conditions (θ = 0.002 m3m-3), which consistent with Fecan et alOs (1999) theoretical consideration. The soil water content had marked effects on the threshold wind speed u_t and {q}. It was also demonstrated that (1) the saltation flux, q(d), for different particle size {d} for coarse sand particles of 69 to 203 um in diameter in wet condition were smaller than those in dry condition, whereas, the q(d) for fine sand particles of 39 to 54 um did not change and (2) the saltation particle size spectra changed from dry to wet conditions. These results suggest that the {q} depends on particle size and soil water content.

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