塔克拉玛干沙漠腹地沙尘暴对新月形沙丘表面粒度变化的影响

doi:10.12118/j.issn.1000-6060.2023.373

干旱区地理 ›› 2023, Vol. 46 ›› Issue (12): 1995-2004.doi: 10.12118/j.issn.1000-6060.2023.373

塔克拉玛干沙漠腹地沙尘暴对新月形沙丘表面粒度变化的影响

陈京平¹(),余子莹¹,杨帆^2,³,王蜜¹,胡涵¹,丁璇¹,高鑫⁴,王鑫¹()

1.兰州大学资源环境学院，甘肃兰州 730000
2.中国气象局乌鲁木齐沙漠气象研究所，新疆乌鲁木齐 830002
3.新疆塔克拉玛干沙漠气象国家野外科学观测研究站，新疆乌鲁木齐 830002
4.中国科学院新疆生态与地理研究所，新疆乌鲁木齐 830011

收稿日期:2023-07-19 修回日期:2023-09-11 出版日期:2023-12-25 发布日期:2024-01-05
通讯作者: 王鑫（1983-），男，博士，教授，主要从事地貌演化与新生代环境研究. E-mail: xinw@lzu.edu.cn
作者简介:陈京平（1998-），男，硕士研究生，主要从事全球变化与应对方面的研究. E-mail: chenjp21@lzu.edu.cn
基金资助:
第三次新疆综合科学考察项目(2021xjkk0302);国家自然科学基金委面上项目(42072211)

Effect of sandstorms on surface particle size variation of barchan dunes in the hinterland of Taklimakan Desert

CHEN Jingping¹(),YU Ziying¹,YANG Fan^2,³,WANG Mi¹,HU Han¹,DING Xuan¹,GAO Xin⁴,WANG Xin¹()

1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China
2. Institute of Desert Meteorology, China Meteorological Administration (CMA), Urumqi 830002, Xinjiang, China
3. National Observation and Research Station of Desert Meteorology, Taklimakan Desert of Xinjiang, Urumqi 830002, Xinjiang, China
4. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China

Received:2023-07-19 Revised:2023-09-11 Online:2023-12-25 Published:2024-01-05

摘要/Abstract

摘要：

以塔克拉玛干沙漠腹地的新月形沙丘为研究对象，对同一沙丘在沙尘暴作用下形态从新月形沙丘-不规则沙丘-新月形沙丘的演变过程做了观测记录，通过对不同形态沙丘表沙的粒度测量，研究沙尘暴对新月形沙丘表沙粒度的影响。结果表明：（1）新月形沙丘变形前与复原后，迎风坡中轴线处表沙的粒度变化趋势未发生变化，表现为从迎风坡脚至丘顶整体上逐渐变粗，表明风向风力相同或相近时，沙尘暴对形态相近的新月形沙丘迎风坡的粒度分布模式影响较小。（2）新月形沙丘中轴线与沙脊线处表沙均以极细沙和细沙为主，新月形沙丘原貌时，极细沙和细沙的平均占比在迎风坡与背风坡中轴线处分别为83.07%、82.81%，在左翼与右翼沙脊线处分别为84.42%、91.20%，复原为新月形沙丘后，极细沙和细沙的平均占比在迎风坡与背风坡中轴线处分别为73.18%、76.31%，在左翼与右翼沙脊线处分别为76.63%、74.0%。沙尘暴过后复原的新月形沙丘表沙分选性极好，粒径整体偏细，粒度参数一致性增强，表明沙尘暴对新月形沙丘表沙的粒度特征有重要影响。研究结果可为沙尘暴作用下新月形沙丘表沙粒度的空间分布规律研究提供重要参考价值。

关键词: 沙尘暴, 新月形沙丘, 粒度, 塔克拉玛干沙漠

Abstract:

This study focuses on the barchan dunes situated in the hinterland of the Taklamakan Desert in Xinjiang, China. Our observations tracked the morphological evolution of a specific dune as it transforms from a barchan dune to an irregular dune and back to a barchan dune under the influence of sandstorms. By examining the particle size of surface sand across different dune morphologies, we investigate the impact of sandstorms on the particle size distribution in barchan dunes. Our findings reveal the following: (1) The particle size of surface sand along the central axis of the windward slope remains constant before and after the deformation and recovery of the barchan dune. However, there is a gradual increase in coarseness from the dune’s base to its summit. This suggests that, under similar wind direction and force conditions, sandstorms exert minimal influence on the particle size distribution pattern on the windward slope of barchan dunes with comparable morphology. (2) Both the central axis and sand ridges of the barchan dune predominantly feature extremely fine and fine sand. The average content of extremely fine sand and fine sand is 83.07% and 82.81% on the central axis of the windward slope and the leeward slope, and 84.42% and 91.20% on the left and right sand ridges, respectively. Moreover, after the sandstorm, the surface sand of the recovered barchan dune exhibits well-sorted and consistent characteristics, with an overall finer particle size, indicating a significant influence of the sandstorm on the particle size characteristics of the surface sand. These results offer valuable insights into the spatial distribution pattern of surface sand in barchan dunes under the impact of sandstorms.

Key words: sandstorm, barchan dune, particle size, Taklimakan Desert

陈京平, 余子莹, 杨帆, 王蜜, 胡涵, 丁璇, 高鑫, 王鑫. 塔克拉玛干沙漠腹地沙尘暴对新月形沙丘表面粒度变化的影响[J]. 干旱区地理, 2023, 46(12): 1995-2004.

CHEN Jingping, YU Ziying, YANG Fan, WANG Mi, HU Han, DING Xuan, GAO Xin, WANG Xin. Effect of sandstorms on surface particle size variation of barchan dunes in the hinterland of Taklimakan Desert[J]. Arid Land Geography, 2023, 46(12): 1995-2004.

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沙丘形态		新月形沙丘原貌	不规则沙丘	新月形沙丘复原
采样日期		2021年6月25日	2021年7月8日	2021年7月12日
采样日期平均风速/m·s^-1		3.3	6.3	6.8
迎风坡	采样间距/m	1	0.5	0.5
	样品数	8	10	15
	样品编号	A1~A8	B1~B10	C1~C15
背风坡	采样间距/m	0.5	0.5	0.5
	样品数	8	7	5
	样品编号	A9~A16	B11~B17	C16~C20
左翼	采样间距/m	1	0.5	0.5
	样品数	3	14	8
	样品编号	A17~A20	B18~B32	C21~C29
右翼	采样间距/m	1	0.5	0.5
	样品数	3	11	10
	样品编号	A21~A23	B33~B43	C30~C39

沙丘形态	新月形沙丘原貌	不规则沙丘	新月形沙丘复原
沙丘高度/m	1.1	0.8	1.2
迎风坡长度/m	8.3	4.6	7.1
背风坡长度/m	4.1	3.7	2.6
左翼长度/m	3.8	7.2	4.1
右翼长度/m	3.6	6.0	5.2

塔克拉玛干沙漠腹地沙尘暴对新月形沙丘表面粒度变化的影响

Effect of sandstorms on surface particle size variation of barchan dunes in the hinterland of Taklimakan Desert

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