论文部分内容阅读
本文对海坛岛风沙表层沉积物的粒度分布特征进行研究。结果表明:海坛岛风沙沉积物主要是由海岸带基岩和第四纪松散堆积物及闽江南下沿岸流所携带的泥沙,在海洋动力作用下堆积于海滩上,而后在强劲的NNE 向向岸盛行风作用下,海滩沙向陆搬运堆积而成的。风成沙的主要粒级为中沙,平均粒径为1.73Φ;分选较好,标准差的平均值为0.68;偏度多近于对称,偏态平均值为—0.02;峰态窄,峰态平均值为1.21。其搬运方式单一,以跳跃为主,跳跃总体含量的平均值为85.58%。由于岸线方向、发育阶段、原始地形、植被条件等的差异及人类活动程度、改造利用方式的不同,风成沙的粒度特征在不同岸段和不同相带内均有一定差异。它们均是海岸风沙沉积不同发育阶段及不同环境条件下的特定产物。
In this paper, the particle size distribution characteristics of sandstorm sediments in Haitan Island were studied. The results show that the sediment of the alluvial sandy beach in the island of Haitan is mainly sediment carried by coastal bedrock and Quaternary unconsolidated sediments and the coastal stream in the south of the Minjiang River and is deposited on the beach under the action of the ocean. Under the prevailing wind toward the shore, the beach sand piled up to transport. The main grain size of aeolian sand was middle sand and the average grain size was 1.73Φ. The average value of standard deviation was 0.68, the average value of standard deviation was 0.68, the skewness was close to symmetry, the average value of skewness was -0.02, The average kurtosis is 1.21. The handling of a single, mainly to jump, jumping average of the overall content of 85.58%. Due to the difference of shoreline direction, developmental stage, original topography and vegetation condition, and the degree of human activities and the ways of transformation and utilization, the grain size characteristics of aeolian sand vary in different bank sections and different facies belts. They are all specific products of sediment deposition at different stages of development and under different environmental conditions.