Grain size characteristics of moving dune in different geomorphological locations in Pengqu Basin， Tibet， China

doi:10.7522/j.issn.1000-694X.2021.00096

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (6): 138-147.DOI: 10.7522/j.issn.1000-694X.2021.00096

Grain size characteristics of moving dune in different geomorphological locations in Pengqu Basin， Tibet， China

Meihui Pan(), Zewen Hao, Yuhan Qi, Annan Yang, Yougui Chen, Chenlu Li

College of Geography and Environment Science，Northwest Normal University，Lanzhou 730070，China

Received:2021-06-10 Revised:2021-07-20 Online:2021-11-20 Published:2021-12-17

Abstract

Abstract:

Grain size analysis is one of the main methods to study the process of aeolian sand landform. The analysis of sand dune grain size characteristics can not only reflect the source and power of sand dunes， but also reflect the changes of the terrain to the movement of the sand flow. This paper analyzes the grain size characteristics of the surface sediments of the mobile dunes in different geomorphological positions in the Pengqu Basin of Tibet. The results show that：（1） Surface sediments on mobile dunes in Pengqu basin are mainly divided into medium sand （46.51%） and fine sand （40.52%）， followed by coarse sand （5.87%） and very fine sand （5.87%）， and the content of clay （0.37%） and silt sand is the least （0.85%） . The average grain of surface sediments on mobile dunes is in the range of 1.41-2.32 Φ， and the skewness is in the range of 0.01-0.24 . In general， the kurtosis range is 0.98-1.80， and the sorting coefficient is in the range of 0.45-0.79 Φ. （2） The grain size composition of different geomorphic units （river floodplain-river terrace-hillside） gradually becomes finer； the frequency distribution curve gradually becomes higher and steeper， and the probability accumulation curves from southwest to northeast along the dominant wind direction change from two-stage to one-stage， the slope gradually increases， and the sortability gradually becomes better. （3） The surface sediments of the flowing sand dunes from the floodplain to the high-level terraces of the river become finer with increasing altitude， and the particle size from the slope to the top of the slope becomes coarser with the increase in altitude， but the sorting becomes better， indicating the sand materials of the sand dunes on the hillside and the sand dunes on the terrace come from different river sections of riverbed or floodplain. The research results can provide a scientific basis for the prevention and control of desertification in different areas in the study area.

Key words: Pengqu Basin, moving dune, grain size characteristics, flood plain, terrace, mountain slope

CLC Number:

P931.3

Meihui Pan, Zewen Hao, Yuhan Qi, Annan Yang, Yougui Chen, Chenlu Li. Grain size characteristics of moving dune in different geomorphological locations in Pengqu Basin， Tibet， China[J]. Journal of Desert Research, 2021, 41(6): 138-147.

Figures/Tables 9

References 37

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测量参数		LDSQ1	LDSQ2	LDSQ3	LDSQ4	PPSQ1	PPSQ2	PPSQ3	河床
地理位置	纬度（N）	28°29′18″	28°31′24″	28°31′39″	28°32′13″	28°29′04″	28°29′13″	28°29′19″	28°30′11″
地理位置	经度（E）	87°39′28″	87°40′36″	87°41′17″	87°42′17″	87°38′18″	87°38′19″	87°38′20″	87°42′30″
	地貌部位	河漫滩	一级阶地	二级阶地	三级阶地	坡麓	坡中	坡顶	河床
	海拔/m	4 171	4 191	4 191	4 194	4 403	4 434	4 463	/
	坡度/（°）	0.38	0.41	0.38	0.15	13.61	14.41	14.13	/
迎风坡	长度/m	81	44	100	68	40	30	15	/
迎风坡	坡度/（°）	8.8	7.3	1.3	6.1	26	27	25	/
背风坡	长度/m	26	16.4	40	13	6.5	2.5	0.9	/
背风坡	坡度/（°）	28.5	28.5	32	32	32	31.5	31	/
粒度样数/个		9	7	14	10	11	8	5	3

测量参数		LDSQ1	LDSQ2	LDSQ3	LDSQ4	PPSQ1	PPSQ2	PPSQ3	河床
地理位置	纬度（N）	28°29′18″	28°31′24″	28°31′39″	28°32′13″	28°29′04″	28°29′13″	28°29′19″	28°30′11″
地理位置	经度（E）	87°39′28″	87°40′36″	87°41′17″	87°42′17″	87°38′18″	87°38′19″	87°38′20″	87°42′30″
	地貌部位	河漫滩	一级阶地	二级阶地	三级阶地	坡麓	坡中	坡顶	河床
	海拔/m	4 171	4 191	4 191	4 194	4 403	4 434	4 463	/
	坡度/（°）	0.38	0.41	0.38	0.15	13.61	14.41	14.13	/
迎风坡	长度/m	81	44	100	68	40	30	15	/
迎风坡	坡度/（°）	8.8	7.3	1.3	6.1	26	27	25	/
背风坡	长度/m	26	16.4	40	13	6.5	2.5	0.9	/
背风坡	坡度/（°）	28.5	28.5	32	32	32	31.5	31	/
粒度样数/个		9	7	14	10	11	8	5	3

沙丘序号	粒度分级（平均值）/%
沙丘序号	黏土 <0.004 mm	粉沙 0.004—0.063 mm	极细沙 0.063—0.125 mm	细沙 0.125—0.25 mm	中沙 0.25－0.5 mm	粗沙 >0.5 mm
河床	4.65	26.17	23.78	27.30	15.51	2.57
LDSQ1	0.39	0.72	1.51	33.12	54.63	9.62
LDSQ2	0.35	0.66	0.73	16.72	53.60	27.94
LDSQ3	0.00	0.00	5.42	53.75	40.32	0.51
LDSQ4	1.87	3.00	5.05	47.02	41.80	1.26
PPSQ1	0.00	0.75	13.17	51.80	33.50	0.79
PPSQ2	0.00	0.80	11.27	59.84	27.11	0.96
PPSQ3	0.00	0.00	3.93	63.31	32.74	0.01

沙丘序号	粒度分级（平均值）/%
沙丘序号	黏土 <0.004 mm	粉沙 0.004—0.063 mm	极细沙 0.063—0.125 mm	细沙 0.125—0.25 mm	中沙 0.25－0.5 mm	粗沙 >0.5 mm
河床	4.65	26.17	23.78	27.30	15.51	2.57
LDSQ1	0.39	0.72	1.51	33.12	54.63	9.62
LDSQ2	0.35	0.66	0.73	16.72	53.60	27.94
LDSQ3	0.00	0.00	5.42	53.75	40.32	0.51
LDSQ4	1.87	3.00	5.05	47.02	41.80	1.26
PPSQ1	0.00	0.75	13.17	51.80	33.50	0.79
PPSQ2	0.00	0.80	11.27	59.84	27.11	0.96
PPSQ3	0.00	0.00	3.93	63.31	32.74	0.01

样品名称	M_z/Φ	σ/Φ	SK	K_g
LDSQ1	1.78	0.58	0.03	0.96
LDSQ2	1.41	0.60	0.04	0.95
LDSQ3	2.12	0.53	0.01	0.95
LDSQ4	2.14	0.79	0.24	1.80
PPSQ1	2.27	0.62	0.05	0.96
PPSQ2	2.32	0.52	0.02	0.95
PPSQ3	2.21	0.45	0.01	0.95
平均值	2.03	0.58	0.06	1.07

Grain size characteristics of moving dune in different geomorphological locations in Pengqu Basin， Tibet， China

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