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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (5): 82-91.DOI: 10.7522/j.issn.1000-694X.2022.00020

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Dune movement in the joint zone of the Badain Jaran Desert and Tengger Desert

Yunfeng Zhang1(), Yijuan Ma1, Zhizhu Su2, Aimin Liang3(), Xin Zhang3, Yingying Cui3   

  1. 1.School of Geographical Science,Taiyuan Normal University,Jinzhong 030619,Shanxi,China
    2.School of History and Culture,Shanxi University,Taiyuan 030006,China
    3.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
  • Received:2021-12-30 Revised:2022-03-04 Online:2022-09-20 Published:2022-09-22
  • Contact: Aimin Liang

Abstract:

Badain Jaran desert and Tengger Desert are the second and third largest mobile deserts in China. The dynamic monitoring of barchan dunes in the joint zone of the two deserts can reveal the formation and evolution law of dunes in this area, and provide scientific support for the study of aeolian geomorphology development in the joint zone of deserts. The barchan dunes in the joint zome of Badain Jaran Desert and Tengger Desert were monitored by Google Earth high-resolution historical images, and the dune migration rate and morphological changes in this area were analyzed. The results showed that the average migration rate of dunes is 5.88-19.55 m?a-1 in the study area, with an average of 10.03 m?a-1. The moving direction of sand dunes ranges from 109°to 135°, and the average moving direction is 122°. During the dune movement, the dune morphological changes are more complex. Before and after the movement, except for the reduced height of the sand dunes, the length, width, perimeter and basal area and the windward slope of the barchan dunes generally tends to increase. Wind regime provides dynamic conditions for dune movement. The moving direction of sand dunes is consistent with resultant drift direction. The wind direction in the study area is mainly NW and WNW, and the migration rate of south arm of barchan dune is significantly higher than that of north arm due to the influence of WNW direction sand transport. In addition, the dynamic change of dune is also controlled by the morphology of dune itself. There is a significant negative correlation between dune migration rate and dune morphology parameters (windward slope length, height, width, perimeter and basal area) in the study area (P<0.01). The difference of vegetation cover and dune density leads to the difference of dune migration rate. Before and after dune movement, the variation of morphological parameters is complicated. The variation of sand source richness and the change of dune shape caused by interdune shrub are the main reasons for the complexity of dune shape change. The annual sand transport flux of the sand dune junction belt is 170-521 t?m-1, the average of the annual sand transport flux is 301 t?m-1.

Key words: dune migration, dune morphological parameter, barchan dune, Badain Jaran Desert, Tengger Desert

CLC Number: