长乐东部沿岸风沙沉积物的粒度分布特征

长乐东部沿岸风沙沉积物主要是在强劲的NE向向岸盛行风的作用下,潮间带沙向陆地运移、堆积而成的。风成沙的主要粒级为细沙,分选好,偏度多为近对称,峰态窄到很窄。风成沙的搬运方式单一,沉积物中跳跃组分占绝对优势。由于沙源、岸线方向、发育阶段、原始地形、植被条件的差异和人类活动程度、改造利用方式的不同,该区风沙沉积物的粒度特征,在不同岸段及不同相带内均有一定差异。这些具有不同粒度特征的风成沙是海岸风沙沉积在不同发育阶段、不同环境条件下的特定产物。

The Characteristics of the Grain Size Distribution of the Surface Eolian Sands along the Coastal Area of Changle

The distributing direction of eolian sands along the coastal area of Changle is NE-NNE and runs parallel to the coastline. It is produced under the action of the strong NE wind, the beach sands move to backshore and inland area and deposit there. The main grain size grade of eolian sands are fine sands, they are well so rted, their skewnesses are close to symmetry and kurtosises are from narrow to very narrow. The transportation type of eolian sands is single, saltalion population prodominate the eolian sands here. As the differences of the sand supply, direction of coastline, developing phase, bassment topography, plant cover; the divergences of human activities, the types of transforming and utilizing; the grain size characteristics of the eolian sands in various coastal sections and sedimentary facies differ in some extent, they are all the special results of the eolian sands in various developing phases and environments.