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中国沙漠 ›› 1997, Vol. 17 ›› Issue (4): 355-361.

• 研究论文 • 上一篇    下一篇

海岸沙丘沙运动特征若干问题的研究——以闽江口南岸为例

陈方1, 贺辉扬2   

  1. 1. 福建师范大学地理系, 福州 350007;
    2. 集美大学师范学院地理系, 厦门 361021
  • 收稿日期:1997-02-19 修回日期:1997-06-02 出版日期:1997-12-20 发布日期:1997-12-20
  • 作者简介:陈方,男,1963年生,博士,副教授。主要从事海岸海洋地貌和沉积方面的研究。
  • 基金资助:
    福建省自然科学基金资助项目(D970006)

RESEARCH OF SEVERAL PROBLEMS ON MOVEMENT CHARACTERISTICS OF COASTAL DUNE SAND——AN EXAMPLE FROM THE SOUTH COAST OF MINJIANG ESTUARY

CHEN Fang1, HE Hui-yang2   

  1. 1. Department of Geography, Fujian Normal University, Fuzhou 350007;
    2. Department of Geography, Normal College in Jimei University, Xiamen 361021
  • Received:1997-02-19 Revised:1997-06-02 Online:1997-12-20 Published:1997-12-20

摘要: 在海岸带,沙粒粒径和水分含量是决定沙粒起动风速的最主要因素。闽江口南岸海滩沙的平均粒径为2.0Φ,水分含量多在0.3%~1.0%之间。运用Johnson的经验公式,可计算出海滩沙的起动风速为6~7m/s。这一结果与实际观测值十分吻合。由于海岸环境因素的影响,使得同等条件下海岸带沙粒的起动风速明显大于内陆沙漠沙,而风沙流的输沙率明显小于内陆沙漠沙。海岸带是风速剧变带,在引用陆地气象台站的风速记录分析海岸风况和研究风沙运动规律时,必须对风速进行订正。

关键词: 海岸沙丘, 起动风速, 风况, 风沙流, 闽江口南岸

Abstract: The threshold velocity of sand is influenced by many factors in coastal zone,but the grain diameter and moisture content of sand grain are the dominant factors.Along the south coast of Minjiang estuary,the mean grain diameter of beach sand is 2.0Φ and the moisture content of beach sand is almost from 0.3% to 3.2%.Caculated by Johnson's experimental equation,the threshold velocity of movement on the beach is 6~7 m/s.The result coincides with the field observing value very well.On an equal basis,the threshold velocity of sand in coastal zone is much higher than that of sand in inland desert.But the rate of sediment transport in coastal zone is much less than that in inland desert.They have close relationship with the environmental factors of coast.The coastal zone is the belt where the wind velocity changes radically,so the wind velocity record of land meteorological observatory should be corrected when we use it to analyze the wind regime and study the sand transport in coastal zone.

Key words: Coastal sand dune, Threshold velocity, Wind regime, Sand flow, South coast of Minjiang estuary

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