Grain size distribution characteristics of longitudinal dunes in northeastern Taklamakan Desert

doi:10.7522/j.issn.1000-694X.2023.00048

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (6): 1-9.DOI: 10.7522/j.issn.1000-694X.2023.00048

Grain size distribution characteristics of longitudinal dunes in northeastern Taklamakan Desert

Jianzong Liu(), Feng Zhang(), Hongwei Bian, Xuan Li, Chenjie Su

College of Geography and Remote Sensing Sciences，Xinjiang University，Urumqi 830017，China

Received:2023-02-10 Revised:2023-04-18 Online:2023-11-20 Published:2023-11-30
Contact: Feng Zhang

Abstract

Abstract:

Longitudinal dunes are widely developed in the northeastern Taklamakan Desert， but the particle size characteristics of sediments have rarely been reported. The sediment grain-size characteristics of a longitudinal dune profile and an overlying secondary dune profile in the northeastern Taklamakan Desert were determined by sieve analysis. The results showed that：（1） The sediment particles of the longitudinal dunes gradually became finer and poorly sorted from the top of the dune to the bottom of the slope on both sides； the same was true for the overlying secondary dunes. （2） The frequency distribution curves of the longitudinal dunes sediments was mainly bimodal. （3） The average sediment size in the middle of the windward slope of the longitudinal dune was finer than that in the middle and lower parts； the sediment particles in the bottom of the windward slope of the overlying dunes is coarser than that in the middle of the windward slope. It is concluded that the particle size distribution of the longitudinal dunes in this area is consistent with the "coarser ridge type" proposed by previous authors. The bimodal distribution of sediment samples is significantly influenced by the source and wind selection. The coarsening of the bottom of the windward slope on the overlying dune profile may be due to the enrichment of coarse particles that cannot be carried away. Local changes in the morphology of the overlying secondary dunes of the longitudinal dunes affect the wind-sand flow， which leads to local changes in the mean particle size and sorting coefficient. There is a secondary transport process of wind and sand flow on the windward side of the sand monopoly.

Key words: Taklamakan Desert, longitudinal dunes, grain size analysis, grain size distribution pattern

CLC Number:

P931.3

Jianzong Liu, Feng Zhang, Hongwei Bian, Xuan Li, Chenjie Su. Grain size distribution characteristics of longitudinal dunes in northeastern Taklamakan Desert[J]. Journal of Desert Research, 2023, 43(6): 1-9.

Figures/Tables 6

Fig.1 Location of the study area （DEM data is downloaded from the Geospatial Data Cloud （http：//www.gscloud.cn）， and the data type is SRTMDEM with a resolution of 90 m）

Fig.2 Sampling point distribution and field photos of different parts of the longitudinal dunes； A： The sampled dune； B： Distribution of overlying dune sampling sites； C： Leeward slope of the longitudinal dunes； D： Windward slope of the longitudinal dunes； Photo E-I location see A

Fig.3 Sediment population characteristics （A） and frequency distribution curves （B） of different sampling locations

Fig.4 Distribution of particle size parameters on the sampling profile of the longitudinal dunes

Fig.5 Distribution of particle size parameters on the sampling profile of the overlying dune

Fig.6 Rose diagram of wind speed and direction in different seasons at Korla weather station

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Grain size distribution characteristics of longitudinal dunes in northeastern Taklamakan Desert

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