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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (6): 157-168.DOI: 10.7522/j.issn.1000-694X.2021.00098

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Sediments and morphology of coastal Spinifex littoreus nebkhas on Jingxinjiao beach of Hainan Island, China

Qinni Huang1(), Zhibao Dong1(), Nan Xiao2, Miaoyan Feng3, Huanyu Shi1, Guoxiang Chen1, Ziyi Bai1, Xin Zhang1, Chong Gao1, Xiaozhi Wang1   

  1. 1. School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China
    2. College of Geographical Science,Inner Mongolia Normal University,Hohhot 010022,China
    3. Department of Geography,Lingnan Normal University,Zhanjiang 524048,Guangdong,China
  • Received:2021-07-05 Revised:2021-08-05 Online:2021-11-20 Published:2021-12-17
  • Contact: Zhibao Dong

Abstract:

The coastal nebkhas is an eolian landform widely developed in the coastal areas, and there are many typical Spinifex littoreus nebkhas distributed along the northeastern coast of Hainan Province. Based on field study and laboratory experiments, combine with meteorological data, we systematically analyzed the morphology, dynamic conditions, grain size and geochemical element characteristics of S. littoreus nebkhas on Jingxinjiao beach of Hainan Island. The results show that stable onshore wind and wide sandy beach are the basic conditions for the development of nebkhas. The low wind energy environment and the " shell pavements " on the beach shoulder are the main reasons for the small scale of Jingxinjiao nebkhas. The S. littoreus nebkhas at Jingxinjiao is mainly like cone and tadpole. Compared with the windward slope of nebkhas, the leeward slope has a greater influence on the long axis of nebkhas. The length of the long axis and the windward slope have bigger effect on the height of nebkhas. The growth of S. littoreus nebkhas in the horizontal direction can affect the development of the morphology of nebkhas more.

Key words: nebkhas, sedimentary characteristics, morphology, Spinifex littoreus, Hainan Island

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