The development of aeolian geomorphology is controlled by near surface sand movement, whereas the current research pays more attention to the short period (a few minutes to a few hours) and single direction (facing the main direction) of the blowing sand structure characteristics, and it is difficult to relate the results to the long-term geomorphological processes. Thus, we conducted a whole year field observation of aeolian sediment transport from May 2014 to May 2015 in the Sanlongsha Area of the Northern Kumtagh Desert, adopting the eight-directional four layer gradient sand trap (SEDST). After continuous observation of six periods, totally obtained 192 sand samples from different directions and different heights. Observation results show that the total weight of the captured sediments is 405.2 kg within 1 m above the ground and 75.3% of them are transported within 0-0.2 m, reflecting the characteristics of near surface sediment transport. The average sediment transport rate is 55.2 kg·5m-1·5d-1, with sediments mainly from the N, NE and NW directions, and there is significant diversity in different seasons, and the maximum transport rate in spring is 2.5 times of the annual average value, followed by summer and winter minimum. The annual average sediment flux profile (blowing sand structure) shows exponential decline trend, part of the flux profile has presented the "trunk effect" over the gobi surface. The annual mean net flux is 1.159 kg·5m-1·5d-1, along with the increase of the height decreased, and the variation of net flux with altitude at different time periods is consistent with that of the whole year; the annual mean resultant sediment transport direction is 193.2, and the direction of sediment transport increases with the increase of the height from the northeast to the north. In conclusion, the sediment transport intensity reaches the strongest in the spring, and the main sediment transport direction is N, NE and NW, with a secondary sediment transport direction, S direction, in spring and summer, respectively. The study has great significance for the further understanding aeolian sediment transport of Sanlongsha area and revealing the material sources of Kumtagh desert.
Yang Zhuanling
,
Qian Guangqiang
,
Dongzhibao
,
Luo Wanyin
,
Zhang Zhengcai
,
Lu Junfeng
,
Li Jiyan
. Aeolian Sediment Transport in the Sanlongsha Area to the North of Kumtagh Desert[J]. Journal of Desert Research, 2018
, 38(1)
: 58
-67
.
DOI: 10.7522/j.issn.1000-694X.2016.00132
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