[1]HE Qiangqiang,MAO Donglei,XU Jiarui,et al.Sediment Granularity Characteristics and Deposition Environment of Different Dunes in the Cele Oasis-Desert Ecotone[J].Research of Soil and Water Conservation,2023,30(03):135-145.[doi:10.13869/j.cnki.rswc.2023.03.007]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 03
Page number:
135-145
Column:
Public date:
2023-04-10
- Title:
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Sediment Granularity Characteristics and Deposition Environment of Different Dunes in the Cele Oasis-Desert Ecotone
- Author(s):
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HE Qiangqiang1,2, MAO Donglei1,2, XU Jiarui1,2, ZHANG Kaili1,2, LIU Lei1,2, YANG Guocheng1,2
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(1.School of Geography and Tourism, Xinjiang Normal University, Urumqi 830054, China; 2.Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, Urumqi 830054, China)
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- Keywords:
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oasis-desert ecotone; sedimentary environment; grain size characteristics; magnetic susceptibility; sand dunes; Cele
- CLC:
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P931.3
- DOI:
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10.13869/j.cnki.rswc.2023.03.007
- Abstract:
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[Objective]The distribution characteristics of particle size, magnetic susceptibility and environmentally sensitive grain size fractions of eolian sand sediments under different dune types in the oasis-desert ecotone were studied to explore the relevant parameters and distribution patterns of eolian sand sediments under different dune types. [Methods] Based on the grain size data and susceptibility data of each part of the four kinds of sand dunes in the oasis-desert ecotone, the correlation analysis was carried out by using mathematical statistical method. [Results] The surface sand contents of the four types of dunes differ in different geomorphic areas, with the surface sand content of the four types of dunes consisting mainly of very coarse silty sand, very fine sand and fine sand, with the total percentage content of 96.71%, 97.54%, 98.48% and 98.65%, respectively. All the four different dunes have moderately good sortability of surface sand material. The mean kurtosis values of the different dunes range from 0.93 to 1.02, which is a medium kurtosis. In general, the kurtosis values of the four dunes increase gradually from the bottom to the top of the windward slope and decrease from the top to the bottom of the leeward slope. The crescent-shaped dunes have the lowest kurtosis values, ranging from-0.03 to 0.01, which are mainly symmetrical, while kurtosis values of the wind shadow, gyre and scrub range from-0.04 to 0.44, which are mainly symmetrical and positively skewed. The mean grain sizes of sand material on the surface of wind shadow dunes, scrub dunes and crescent dunes show the highly significant positive correlation(p<0.01)with the skewness value, indicating that the coarser the mean grain size is, the more positive the skewness tends to be. A highly significant positive correlation(p<0.01)is found between the skewness and kurtosis of the sand material on the surface of the wind-shaded, scrub and crescent dunes, indicating that the poorer the sand material sorting is, the more narrowly kurtotic the sand material tends to be. The four different dune environments have sensitive grain size fractions concentrating in the range of 100~570 μm, indicating strong wind and sand activity in the study area, and large differences in the relative variation of grain size-standard deviation values of the samples due to the differential structure and anthropogenic causes of the geographical elements. [Conclusion] The differences in grain size between the four dune types in the oasis-desert ecotone are mainly due to topography, wind conditions and the structure of the sand source sediments.