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[1]XIAO Jingan,PEI Liang,SUN Liying,et al.Characteristics of Grain Sizes of Sediments in Two Typical Regions of Ejina Gobi[J].Research of Soil and Water Conservation,2021,28(03):38-44.

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Characteristics of Grain Sizes of Sediments in Two Typical Regions of Ejina Gobi

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 03 Page number: 38-44 Column: Public date: 2021-04-20

Title:: Characteristics of Grain Sizes of Sediments in Two Typical Regions of Ejina Gobi

Author(s):: XIAO Jingan^1,2, PEI Liang^1,2, SUN Liying^1,2, MA Wenxiu³; (1.Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.Hebei Langfang Environmental Monitoring Center, Langfang, Hebei 065000, China)

Keywords:: geology; grain size characteristics; mean test; Gobi; Ejina Banner

CLC:: P588.21,X141

DOI:: -

Abstract:: By using the method of field survey and indoor particle size test, the particle size parameters such as average particle size, sorting coefficient, skewness and kurtosis were calculated by the moment method to analyze the grain size characteristics of the two typical regional vertical profiles in the Gobi of Ejina Banner. The independent sample mean test is used to determine whether there is significant difference between the grain size composition and parameters of the two types of geomorphic sediments. The results show that:(1)the grain size of the sampling points along the vertical direction of the profile is gradually refined from top to bottom; the average grain size of the upper and lower layers of the ancient river channel sampling points is similar, sand is mainly dominant in 0—10 cm layer, and gravel and sand are mainly dominant in 10—20 cm layer;(2)the sorting coefficient of the sediment particles at the sampling points of the two geomorphic types is poor or much poorer;(3)the sediment skewness of the sampling points of the two geomorphic types is positive skew;(4)the frequency curve of sediment particle size is mainly very wide and very wide;(5)there is significant difference in the percentage of clay, silt and gravel components in the Gobi sediment of the two geomorphic types, and there is no significant difference in the percentage of sand components; in the particle size parameters, there is significant difference in the average particle size, and there is no significant difference in the sorting coefficient, skewness and kurtosis Sexual differences. All in all, the sediment profiles of gobi appeares the characteristics of fine average grain size, poor or pooer sorting coefficient, positive skewness and extremely positive skewness, wide flat kurtosis and very flat kurtosis, the average grain size of lake bank sampling points is significantly larger than that of paleochannel sampling points, while sorting coefficient, skewness and peak state have no significant difference. It comprehensively reflects the similarities and differences of sedimentary environment, erosion and accumulation mode of particles in different layers of Gobi of two geomorphic types, which can provide basis for gobi classification.

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Last Update: 2021-04-20