Two Processes of Barchan Dune to Maintain Relatively Stable

doi:10.7522/j.issn.1000-694X.2015.00224

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (4): 871-876.DOI: 10.7522/j.issn.1000-694X.2015.00224

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Two Processes of Barchan Dune to Maintain Relatively Stable

Chang Zhaofeng¹, Li Yijun¹, Wang Liang², Wang Qiangqiang¹, Zhang Jianhui¹, Tang Jinnian¹, Zhang Dekui¹, Wang Qi¹

1. Gansu Desert Control Research Institute, Lanzhou 730070, China;
2. Adminstration of Cansu Anxi National Nature Reserve in Hyper-Arid Desert, Jiuquan 736100, Gansu, China

Received:2015-08-03 Revised:2015-09-21 Online:2016-07-20 Published:2016-07-20

Abstract

Abstract: The barchans dune top stability mechanism is an unresolved aeolian geomorphology problem. It has important practical significance for revealing oasis fringe sand movement laws, constructing sand prevention and control projects, protecting ecological environment to research barchan dune top stability mechanism. This paper analyzed the stability mechanism of barchan dune top by measuring wind speed, aeolian erosion and particle sizeat various parts of the barchan dune in Minqin desert. The results show that during the main direction wind (NW) process the highest point of the barchan dunes coincide with the barchan dune ridges, barchan dunes advance forward and barchan dunes height reduces; during reverse wind (SE) process the highest points of the barchans dunes and barchans dune ridges separate, wind erosion takes place at barchans dune leeward slope and barchan dunes height increase. Because NW wind is main wind direction, and barchan dune move along the NW-SE direction, SE wind only can erode and slow down the sand dune leeward slope gradient. Artificial intervention will prevent or reduce the sediment delivery capacity from the windward slope to the top of the dune, make wind erosion more significant at the barchan dunes leeward, especially in the upper part of the barchans dune leeward, so barchans dunes gradually change to parabolic dunes.

Key words: barchan dune, dune top, stability, minqin desert area

CLC Number:

S727.23

Chang Zhaofeng, Li Yijun, Wang Liang, Wang Qiangqiang, Zhang Jianhui, Tang Jinnian, Zhang Dekui, Wang Qi. Two Processes of Barchan Dune to Maintain Relatively Stable[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(4): 871-876.

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Two Processes of Barchan Dune to Maintain Relatively Stable

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