Distribution and morphological parameters of dunes in the Badain Jaran Desert based on DEM

doi:10.7522/j.issn.1000-694X.2020.00016

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (4): 81-94.DOI: 10.7522/j.issn.1000-694X.2020.00016

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Distribution and morphological parameters of dunes in the Badain Jaran Desert based on DEM

Keqi Wang¹^,²(), Hui Zhao¹(), Yongwei Sheng³, Shengan Zhang³, Xingfan Wang¹^,², Hongyu Yang¹^,², Qian Chao¹^,²

^1.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
^2.University of Chinese Academy of Sciences, Beijing 100049, China
^3.Department of Geography, University of California Los Angeles, Los Angeles 90095, CA, USA

Received:2019-12-09 Revised:2020-01-22 Online:2020-08-20 Published:2020-09-01
Contact: Hui Zhao

Abstract

Abstract:

The morphologic characteristics of dunes are one of the important contents in the study of aeolian sand landform. Because of the excellent three-dimensional topographic expression ability, the digital elevation model (DEM) has been widely applied in the study of dune morphology. However, due to the constraints of traffic conditions and research methods, studies on dune morphology in the Badain Jaran Desert mostly focus on compound transverse dunes at the southeast margin of the desert. There is a lack of systematic cognition of the morphological characteristics and distribution of different dunes in the desert, but the study of morphologic characteristics of all the dunes in the desert is an important part of the study of formation and evolution of regional aeolian sand landform. In this paper, all the independent dunes in the Badain Jaran Desert are taken as the research object. DEM data and a new algorithm were used to systematically study the morphological characteristics and distribution of two types of dunes in the desert. The results show that there are about 6 033 independent dunes in the desert, with the height ranging from 9m to 433 m. There are 53 dunes whose height over 350m. Among them, there are 7star dunes with a maximum height 373 m and 46 transverse dunes with a maximum height 433 m. There are 602 sample dunes selected to analyze their morphological parameter. The linear correlations between the height and equivalent sand thickness of transverse dunes indicate that the height of transverse dunes is still increasing, and the logarithmic function relation between equivalent sand thickness and the height of star dunes shows that the height growth of star dunes is slowing down. The main axis of the two types of dunes is mostly perpendicular to the dominant wind direction of the desert, NW-SE. The threshold wind direction of transverse dunes is single, and transverse dunes’ orientation is mainly NE-SW and NNE-SSW. The threshold wind direction of star dunes is complex, and there are several secondary dune axe directions of star dunes.

Key words: digital elevation model, Badain Jaran Desert, dune morphological parameter, transverse dunes, star dunes

CLC Number:

P931.3

Keqi Wang, Hui Zhao, Yongwei Sheng, Shengan Zhang, Xingfan Wang, Hongyu Yang, Qian Chao. Distribution and morphological parameters of dunes in the Badain Jaran Desert based on DEM[J]. Journal of Desert Research, 2020, 40(4): 81-94.

Figures/Tables 9

Fig.1 Location and sampling of the study area

Fig.2 Schematic diagram of dune morphological parameters

Fig.3 Histogram and probability density curve of dune height

Fig.4 Distribution of dune height in the Badain Jaran Desert

Fig.5 Boxplot of dune morphological parameters

Table 1 Correlation analysis of dune morphological parameters

	沙丘高度	沙丘间距	等效沙山厚度	沙丘轴长
沙丘高度	1	0.879^**	0.891^**	0.428^**
沙丘间距	0.879^**	1	0.806^**	0.479^**
等效沙山厚度	0.891^**	0.806^**	1	0.506^**
沙丘轴长	0.428^**	0.479^**	0.506^**	1

Fig.6 Regression analysis of dune morphological parameters

Fig.7 The annual drift potential at meteorological stations around the desert in 1994-1996

Fig.8 Rose diagrams of dune axis orientation

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Distribution and morphological parameters of dunes in the Badain Jaran Desert based on DEM

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