海岸沙丘沙运动特征若干问题的研究──以闽江口南岸为例  

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

作　　者：陈方[1,2] 贺辉扬[1,2] 

机构地区：[1]福建师范大学地理系 [2]集美大学师范学院地理系

出　　处：《中国沙漠》1997年第4期355-361,共7页Journal of Desert Research

基　　金：福建省自然科学基金

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。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 2.0 Φ 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.

关 键 词：海岩 沙丘沙 运动特征 风沙流 

分 类 号：P931.3[天文地球—自然地理学]