策勒河下游风积地貌沉积物粒度特征及沙源分析

doi:10.13866/j.azr.2024.08.15

Abstract

Abstract:

The grain size characteristics of sediments provide extensive information on environmental change, which is of great importance for the study of desert management and for preventing desertification. The grain size characteristics and sedimentary environment stability of different aeolian landforms were studied using grain size analysis, the grain size-standard deviation method, and Sahu genetic discrimination. The results show that: (1) The surface sediments of barcrescent dune s, scrub dunes, and low bare flat sand are dominated by medium sand, fine sand, and extremely fine sand. The surface sediments were coarsest in barcrescent dunes and smallest in scrub dunes, with average grain sizes of 270.42 µm and 95.60 µm, respectively. (2) The sediment sorting of the three geomorphic types was poor, with proportions of 74.47%, 90.47% and 66.7%, respectively. The surface sediments of barcrescent dunes have a negatively skewed distribution and medium peak state, whereas the surface sediments of scrub dunes and low bare flat sand have a symmetrical distribution, medium peak state, and narrow peak state. (3) The environmentally sensitive components of the three different aeolian landforms were concentrated in the size range from 22.4-399 µm, which is more sensitive to climate change and therefore more able to reflect changes in the sedimentary environment, indicating that the aeolian sedimentary environment is mainly dominated by aeolian sedimentary environment. (4) The surface sediments of scrub dunes were found wholly in the aeolian environment, and the surface sediments of barchan dunes and low bare flat sand were found in both aeolian and fluvial environments.

Key words: shrub-coppice dune, barchan dune, low bare flat sandy land, deposit sediment, particle size characteristics

LI Xinxin, MAO Donglei, LAI Fengbing, XUE Jie, HE Qiangqiang, MA Yujiao. Grain size characteristics and sand source analysis of three aeolian landforms in the lower reaches of the Qira River floodplain[J].Arid Zone Research, 2024, 41(8): 1413-1422.

Figures/Tables 10

Fig. 1

Fig. 2

Fig. 3

Tab. 1

Tab. 2

Sedimentary environment identification formula and criteria"

环境鉴别	判别公式	判定标准
风成与海滩	$Y 1 = - 3.568 M Z + 3.7016 σ 2 - 2.0766 S K + 3.1135 K G$	Y<-2.7411，为风成沉积环境 Y>-2.7411，为海滩沉积环境
海滩和浅海	$Y 1 = 15.6534 M Z + 65.7091 σ 2 - 18.1071 S K + 18.5043 K G$	Y<65.3650，为海滩沉积环境 Y>65.3650，为浅海沉积环境
浅海与河流	$Y 1 = 0.2825 M Z - 8.7604 σ 2 + 4.8932 S K - 0.0482 K G$	Y<-7.4190，为河流沉积环境 Y>-7.4190，为浅海沉积环境
河流与浊流	$Y 1 = 0.7215 M Z - 0.40304 σ 2 + 6.7322 S K + 5.2927 K G$	Y<9.8433，为浊流沉积环境 Y>9.8433，为河流沉积环境

Tab. 2

Fig. 4

Tab. 3

Fig. 5

Fig. 6

Fig. 7

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类别	粒级	范围/μm
黏土	黏土	0~2
粉砂	极细粉砂	2~4
	细粉砂	4~8
	中细粉砂	8~16
	粗粉砂	16~31
	极粗粉砂	31~63
砂	极细砂	63~125
	细砂	125~250
	中砂	250~500
	粗砂	500~1000
	极粗砂	1000~2000

沙丘	参数	最小值	最大值	均值±标准差
新月形沙丘	平均粒径/μm	144.082	576.052	270.419±2.726
	分选系数	1.489	2.001	1.817±0.282
	偏度	-0.392	0.174	-0.125±0.0131
	峰度	0.734	1.357	0.969±0.148
灌丛沙丘	平均粒径/μm	81.317	124.129	95.600±1.340
	分选系数	1.360	2.354	1.647±0.140
	偏度	-0.016	0.124	0.046±0.038
	峰度	0.809	0.971	0.917±0.041
低裸平沙地	平均粒径/μm	96.911	299.241	176.677±0.338
	分选系数	1.549	2.671	2.197±0.381
	偏度	-0.426	0.330	0.272±0.278
	峰度	0.636	1.213	0.864±0.219

Grain size characteristics and sand source analysis of three aeolian landforms in the lower reaches of the Qira River floodplain

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[1]	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.
[2]	REN Xiaozong,WANG Songsong,WANG Yamei,LUO Jinhong,MA Yongtao. Geomorphologic characteristics of the co-existence zone of barchan and parabolic dunes in western Hunshandake Sandy Land [J]. Arid Zone Research, 2023, 40(12): 2016-2030.
[3]	CAI Dong-xu, LI Sheng-yu, LEI Jia-qiang, WANG Hai-feng, MENG Xiao-yu. Effect of Barchan Dune on Surface Wind Erosion over Lacustrine Plain [J]. , 2018, 35(6): 1496-1504.