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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (3): 94-105.DOI: 10.7522/j.issn.1000-694X.2019.00074

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Spatial-temporal variation of drift potential and dune morphology evolution during 2008-2018 in Changli coast of Hebei, China

Li Zhixing1,2, Li Zhizhong1,2,3, Jin Jianhui1,2,3, Zheng Fei1,2, Zhang Wenjing1,2, Bai Li4   

  1. 1. Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350007, China;
    2. College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;
    3. Institute of Geography, Fujian Normal University, Fuzhou 350007, China;
    4. Baise University, Baise 533099, Guangxi, China
  • Received:2019-08-20 Revised:2019-09-12 Online:2020-05-20 Published:2020-06-09

Abstract: The spatial-temporal variation of drift potential is an important index in studying the morphology and spatial-temporal variation of aeolian dunes. In this study, aeolian coastal dunes in Changli, Hebei,China, are chosen as study object. The spatial-temporal variation of drift potential during 2008-2018 are analysed via the wind data from adjacent meteorological stations, and multi-period high resolution images derived from the Google Earth platform are used to extract information about the changes in dune morphology. Besides, the driving mechanism of the distribution pattern and morphological change of coastal dunes are discussed comprehensively based on wind regime, precipitation and human activities. The results show that: (1)The drift potential (DP) is high during spring and winter, and the sand drift is active.(2) Among these three meteorological stations, the landward resultant drift direction of Laoting station represents the main direction of sand drift in study area, while the seaward resultant drift direction of Changli station reflects the secondary direction of sand drift, and the distribution of coastal dunes in our study area is controlled by these two sand-drifting processes. (3)Both the landward and the seaward DP and resultant drift potential (RDP) generally show a decreasing trend, while the resultant drift direction (RDD) shows no significant change. (4) During the past decade, the aeolian geomorphology of Changli coast shows a characteristic of recession as a whole, the influence of climate change is limited, but the reduction of sand supply caused by artificial afforestation, windbreak and sand fixation activities is the main reason.

Key words: coastal dunes, drift potential, barchan dunes, transverse dunes, dune recession, Changli

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