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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (6): 249-261.DOI: 10.7522/j.issn.1000-694X.2021.00154

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Aeolian sand transport and its potential amount into Longyangxia Reservoir in 1987-2019 based on COSI-Corr

Mei Shao1,2(), Wanyin Luo1(), Xuehua Che1,2, Fang Wang1, Junfeng Lu1, Songbing Zou3   

  1. 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.College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
  • Received:2021-10-09 Revised:2021-11-04 Online:2021-11-20 Published:2021-12-17
  • Contact: Wanyin Luo

Abstract:

Aeolian sand invasion has negative effect on the Yellow River and Longyangxia reservoirs. It is of great significance to sort out the provenance and the potential amount of sand transported into the reservoir to reduce the aeolian sandy hazards. In this study, the dune migrating trends were monitored and the potential amount of sand transported into the Longyangxia reservoir was evaluated using the Co-registration of Optically Sensed Images and Correlation (COSI-Corr) technique based on the Landsat images in 1987, 1995, 2003, 2013 and 2019. The results revealed that: (1) The mean annual dune migration rates upwind the study area was 5.81 m·a-1, with a trend of increasing from 1987 to 2003, then decreasing from 2003-2013 and increasing finally from 2013 to 2019. The dune migration directions were ranged from 132.81° to 165.82° during the 32 years, consisting well with the local prevailing wind. (2) The total potential amount of sand transported into the Longyangxia Reservoir from 1987 to 2019 was 7.82×107 m3(1.20×108 t). The upwind Talatan sandy land contributed 7.38×107 m3 (1.14×108 t) sand into the reservoir, while the downwind Mugetan sandy land only contributed 0.44×107 m3 (0.68×107 t). (3) The factors that affect the sand into the reservoir include the wind, climate and vegetation cover. With the future global warming on the Tibet Plateau, the intensity of aeolian activity will increase, therefore the long-term sand cumulative damage will seriously threaten the security of the reservoir area according to our evaluation, which must be paid enough attention and take some necessary actions to control it.

Key words: Longyangxia Reservoir, aeolian activity, potential sand amount transported into the reservoir, COSI-Corr

CLC Number: