浑善达克沙地西部新月形沙丘和抛物线沙丘共存区的地貌特征

doi:10.13866/j.azr.2023.12.14

Abstract

Abstract:

Barchan and parabolic dunes can be transformed into each other and coexist in the same area, resulting in a unique landscape in which typical barchan dunes coexist with embryonic barchan and parabolic dunes. It is helpful to understand the causes of their formation and execute targeted desertification prevention and control projects after studying their spatial distribution, morphological characteristics, and migration. Based on the Esri historical image service (World Imagery Wayback), the morphological parameters of the dunes in the coexistence zone of the barchan and parabolic dunes, west of Hunshandake Sandy Land, were extracted in three periods: January 15, 2008, June 4, 2011, and September 20, 2016, and the direction and velocity of the dune migration were calculated. The results indicate that typical barchan dunes are concentrated in 15 areas related to the dry lake bed in the western part of the sandy land, whereas embryonic barchan and parabolic dunes are sequentially distributed around the periphery of the dry lake bed. The appearance of the dry lake bed was a key factor in the development of the typical barchan dunes in the Hunshandake Sandy Land. Therefore, more attention should be paid to the desertification caused by the lake drying up. The analysis of morphological parameters of sand dunes in the fifth zone, where the co-existence of barchan and parabolic dunes is typically found, indicates that the typical barchan and embryonic barchan dunes significantly differ from embryonic parabolic dunes. The correlation analysis between the morphological parameters of sand dunes indicates that toss slope length, lee slope length, and bottom area are inherited from the barchan to parabolic dunes, with horns experiencing the greatest changes during this process. Furthermore, the migration directions of the three types of dunes are almost equal but have varying migration velocities, as well as the factors that affect the migration of sand dunes. The most significant impact on the embryonic parabolic dunes, whose vegetation cover is relatively high, was the vegetation cover, whose variation was consistent with that of NDVI during the same period. The most significant impact on the typical barchan and embryonic barchan dunes, whose vegetation cover is relatively low, was wind speed, whose variation was consistent with that of DP and RDP during the same period. Additionally, other factors, including terrain, sand sources, and human activities, can influence the morphology and migration of barchan-parabolic dunes.

Key words: barchan dunes, parabolic dunes, coexistence, morphology and migration, Hunshandake Sandy Land

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.

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	迎风坡L_U/m			背风坡L_D/m			翼间宽W/m
	最小值	最大值	平均值	最小值	最大值	平均值	最小值	最大值	平均值
1期1型沙丘	93.18	241.26	163.66	17.29	49.67	33.07	106.11	356.15	217.95
1期2型沙丘	78.03	293.52	180.05	8.45	49.07	28.79	72.27	320.79	189.29
1期3型沙丘	99.58	307.90	212.79	13.66	36.94	26.62	52.36	311.31	172.55
2期1型沙丘	109.76	233.90	167.72	17.91	41.22	26.18	117.38	363.22	208.39
2期2型沙丘	83.60	285.66	188.52	8.55	39.13	22.55	78.22	346.92	186.55
2期3型沙丘	105.05	339.38	223.50	7.61	30.43	19.07	48.25	248.96	150.86
3期1型沙丘	112.74	233.69	177.99	18.72	40.34	27.86	138.05	334.58	208.33
3期2型沙丘	91.64	281.26	193.02	9.06	37.74	24.07	66.62	321.69	180.09
3期3型沙丘	120.47	330.25	220.29	8.67	39.22	23.06	49.06	282.46	158.45
	南翼L_S/m			北翼L_N/m			底面积S/km²
	最小值	最大值	平均值	最小值	最大值	平均值	最小值	最大值	平均值
1期1型沙丘	33.92	129.88	83.42	33.21	117.47	79.46	0.03	0.09	0.06
1期2型沙丘	22.65	504.75	89.36	20.30	728.25	110.29	0.01	0.14	0.07
1期3型沙丘	41.74	840.73	356.20	28.73	902.92	376.63	0.03	0.11	0.08
2期1型沙丘	42.71	171.29	85.74	41.99	133.96	78.81	0.03	0.08	0.05
2期2型沙丘	16.71	560.49	132.89	9.69	715.70	123.86	0.01	0.14	0.06
2期3型沙丘	33.22	827.25	376.48	25.41	899.38	396.29	0.03	0.11	0.08
3期1型沙丘	42.81	172.53	100.54	37.89	113.17	70.30	0.03	0.08	0.06
3期2型沙丘	22.75	576.79	140.49	15.73	751.95	130.28	0.01	0.14	0.06
3期3型沙丘	35.67	845.07	369.31	36.38	901.68	402.97	0.03	0.13	0.08

	平均移动速度/（m·a^-1）
沙丘类型	1时段（1~2期）						2时段（2~3期）
沙丘类型	迎风坡前端	沙丘顶点	背风坡底	南翼	北翼	整体移速	迎风坡前端	沙丘顶点	背风坡底	南翼	北翼	整体移速
典型新月形沙丘	3.52	4.73	2.92	3.63	2.63	3.49	3.33	3.98	3.77	4.01	3.60	3.74
雏形新月形沙丘	2.88	5.57	3.08	3.00	2.53	3.41	3.28	3.98	3.93	3.73	3.92	3.77
雏形抛物线沙丘	2.95	5.72	3.27	3.55	2.62	3.62	2.80	2.99	2.93	2.01	2.30	2.60
平均值	3.12	5.34	3.09	3.40	2.60	3.51	3.14	3.65	3.54	3.25	3.27	3.37

二连浩特气象站	DP	RDP	RDD	RDP/DP
2008—2011年	61	51	271.52	0.83
2011—2016年	394	280	274.67	0.71

Geomorphologic characteristics of the co-existence zone of barchan and parabolic dunes in western Hunshandake Sandy Land

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