img

Wechat

Adv search

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (1): 160-168.DOI: 10.7522/j.issn.1000-694X.2022.00114

Previous Articles     Next Articles

Preliminary results of sedimentary structure of compound crescentic dune in the lower reaches of Tora River Basin, Qaidam Basin probed with ground penetrating radar

Xiao Zhang1(), Ping Yan1(), Miao Dong2, Xiaokang Liu3, Wenjie Yuan1, Xiaoxu Wang1   

  1. 1.Faculty of Geographical Science/State Key Laboratory of Earth Surface Processes and Resource Ecology Zhuhai Base,Beijing Normal University,Beijing 100875,China
    2.Institute of Geographic Science,Taiyuan Normal University,Jinzhong 030619,Shanxin,China
    3.School of Geography and Tourism,Shannxi Normal University,Xi'an 710119,China
  • Received:2022-08-16 Revised:2022-09-19 Online:2023-01-20 Published:2023-01-17
  • Contact: Ping Yan

Abstract:

As one of the main distribution areas of plateau deserts in China, the Qaidam Basin Desert is located in the western part of Qinghai Province, with various types of riverine dune development, which is important for studying the morphological development of aeolian geomorphology and the formation and evolution of deserts. Ground penetrating radar (GPR) was used to detect two typical compound crescent dunes on the right bank of lower reaches of Tora River, three detecting lines parallel to the wind direction were arranged and radar facies image information was obtained. Combined with UAV images, remote sensing images and field actual investigation, the aeolian sand sedimentary structure and sedimentary environment in the study area are comprehensively analyzed. The results indicate that: (1) The antenna of 100 MHz, 0.5 m detection step and 1 m antenna spacing are selected for the detection, and the ground-penetrating radar images show a good correspondence with the UAV images, so it is feasible to detect the internal structure of the compound crescent dune with these parameters. (2) The depositional structures inside the compound crescent dune in the lower reaches of Tora River are of various types, and the forward accretion layer and vertical accretion layer are widely developed. (3) Both the river and the dunes are moving to the southeast, and the scale of the development process is continuously decreasing and the two flanks are elongating, gradually becoming asymmetric. (4) The development of the compound crescentic dunes in the lower Tora River is divided into three periods: rapid development stage, fixed wind erosion stage, and erosion residual accretion stage.

Key words: Qaidam Basin, lower reaches of Tora River, compound crescent dune, ground penetration radarl, sedimentary structure

CLC Number: