塔克拉玛干沙漠南缘新月形沙丘移动特征

doi:10.13866/j.azr.2024.04.12

Abstract

Abstract:

The movement characteristics of barchan dunes in the southern edge of the Taklamakan Desert reveal wind-sand transport features and geomorphological evolution processes, which are of great significance for the systematic prevention of sand and dust disasters in the region. This study used satellite remote sensing images and meteorological reanalysis data to analyze the morphological changes and moving features of six barchan dune groups along the southern edge of the Taklamakan Desert from 2012 to 2022. The results showed that (1) the average moving speed of barchan dunes within the study area was 6.86 m·a^-1, and the moving direction was consistent with the prevailing wind direction in the corresponding region; (2) the association between the morphological parameters of barchan dunes within the area was complex; (3) the movement of barchan dunes is jointly influenced by the wind energy environment, topography, climatic conditions, and vegetation coverage, of which the dune height, underlying surface vegetation coverage, average annual rainfall, and surface temperature were negatively correlated with dune moving speed, and these negative correlations were significantly optimized after regional classification; (4) the average sand transport rate in the study area was 77120.5 kg·m^-1·a^-1, and it was influenced by the underlying surface conditions and the wind energy environment within the region, which provides an important reference for optimizing sand prevention and control measures. The study results reflect the complexity of the moving pattern of the barchan dunes, and the degree of impact varied with the presence of different geographical environmental factors, which necessitates field-specific analysis. Moreover, the dynamic changes in morphological parameters during the evolution of dunes reveal the internal mechanism of dune migration, providing substantial data for studying the evolution characteristics of dunes and a scientific basis for wind prevention and solidifying work and land planning.

Key words: barchan dunes, migration velocity, morphological parameters, wind regime, southern edge of the Taklamakan Desert

LIU Xin, GAO Xin. Migration velocity of barchan dunes at the southern margin of the Taklamakan Desert[J].Arid Zone Research, 2024, 41(4): 661-673.

Figures/Tables 15

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	影像时间/年-月-日	数据来源	分辨率
沙丘群1	2011-11-10	WorldView-2	0.54 m
沙丘群1	2020-05-11	WorldView-2	0.54 m
沙丘群2	2011-10-02	WorldView-2	0.54 m
沙丘群2	2020-02-14	WorldView-2	0.54 m
沙丘群3	2011-11-19	WorldView-2	0.54 m
沙丘群3	2020-07-24	WorldView-2	0.54 m
沙丘群4	2011-04-16	WorldView-2	0.54 m
沙丘群4	2020-04-24	WorldView-2	0.54 m
沙丘群5	2011-12-31	WorldView-2	0.54 m
沙丘群5	2019-12-04	WorldView-2	0.54 m
沙丘群6	2011-12-31	WorldView-2	0.54 m
沙丘群6	2020-09-30	WorldView-2	0.54 m

	移动速率			移动方向
	范围/(m·a^-1)	均值/(m·a^-1)	标准差	范围/(°)	均值/(°)	标准差
沙丘群1	1.1~6.5	4.2	1.2	19.6~284.0	112.9	38.5
沙丘群2	0.2~18.6	6.0	4.2	97.8~299.1	117.2	41.6
沙丘群3	5.9~13.6	9.4	1.9	59.8~258.6	102.6	28.8
沙丘群4	4.8~13.5	8.3	2.6	73.7~113.9	90.6	8.2
沙丘群5	8.1~20.9	12.2	3.5	212.2~234.9	223.1	5.4
沙丘群6	3.5~13.5	7.7	2.2	47.6~254.4	219.5	32.7

		北翼	南翼	迎风坡	背风坡	宽度
沙丘群1	范围	41.7~296.1	34.8~300.0	33.6~99.0	2.1~10.3	28.3~202.9
沙丘群1	均值	133.2	105.5	65.6	6.0	98.9
沙丘群2	范围	45.6~376.3	48.7~282.7	34.5~126.9	2.5~11.3	37.8~280.5
沙丘群2	均值	198.3	154.6	82.7	6.9	158.1
沙丘群3	范围	56.8~310.2	55.6~349.0	28.2~140.4	1.8~8.2	52.6~220.4
沙丘群3	均值	137.5	109.3	60.8	4.3	95.1
沙丘群4	范围	23.6~128.5	15.0~162.9	18.1~85.2	1.7~4.3	13.7~190.6
沙丘群4	均值	76.6	69.4	44.6	2.8	75.0
沙丘群5	范围	29.9~161.0	34.7~311.4	13.4~70.6	3.0~10.3	24.5~262.4
沙丘群5	均值	89.0	170.5	37.8	5.8	140.9
沙丘群6	范围	187.1~1273.5	94.0~432.9	53.3~283.2	4.9~24.3	163.3~837.7
沙丘群6	均值	468.2	255.1	102.1	12.2	435

	NDVI	降雨量/mm	地表温度/℃
沙丘群1	0.058	47.74	27.25
沙丘群2	0.044	34.77	27.91
沙丘群3	0.043	29.30	26.29
沙丘群4	0.054	29.10	23.96
沙丘群5	0.039	33.02	24.72
沙丘群6	0.034	19.90	25.26

Migration velocity of barchan dunes at the southern margin of the Taklamakan Desert

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