Characterization of Sandy Gravelly Surface Classification Based on Sediment Grain Size and Its Gravel Cover
Surface sediment grain size and gravel cover are important surface parameters affecting the release of wind eroded sand and dust from the Gobi surface.In this study,different types of Gobi in Suhuntu were used as the study area,and the grain size and gravel cover parameters were quantitatively analyzed by field observation,indoor grain size analysis and digital image interpretation.The results showed that(1)the average grain size(MZ),sorting coefficient(σ0),skewness coefficient(SK),kurtosis coefficient(KG),and full-grain size parameter(C,μ)indicated the consistency of sandy-gravelly surface genesis.(2)The full grain size parameters(μ,Dc)can express the hetero-geneity of the surface:for coarse gravelly surface,the range of μ was 0.004-0.087,with an average of 0.050,and the range of Dc was 0.540-3.084,with an average of 1.444.for medium gravelly surface,the range of μ was 0.001-0.186,with an average of 0.078,and the range of Dc was 0.630-2.740,with an average of 1.388.While for fine gravelly surface,the range of μ was 0.002-0.117,with an average of 0.070,and the range of Dc was 0.054-1.270,with an average of 0.646.The mean values of gravel cover for the coarse gravelly surface,medium gravelly surface,and fine gravelly surface were 16.01%,4.53%,and 4.44%,respectively.(3)Based on the correlation between gravel cover,sediment size fraction,MZ and Dc,it can be used as an index parameter for the classification of sandy gravelly Gobi surfaces.
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