海坛岛风沙表层沉积物的粒度分布特征  

Characteristics of grain size distribution of surface eolian sands in Haitan Island,Fujian

作　　者：陈方[1] 李祖光[1] 汪榕光 张文开[1] 

机构地区：[1]福建师范大学地理系,福州350007

出　　处：《台湾海峡》1993年第4期385-392,共8页Journal of Oceanography In Taiwan Strait

摘　　要：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。This paper studies the characteristics of the grain size distribution of the sarface eoliansands in Haitan Island,Fujian.The results show that the eolian sands in Haitan Island are produced,from under the action of the strong NNE wind,the beach sands that mainly origi-nates from the weathering and erosional products of the coastal bedrock and Quaternary sedi-ment which move landward and deposit,the main grain size grade of eolian sands are mediumsands,their mean diameter is 1.77Φ;they are fairly well sorted,their mean value of the stan-dard deviation is 0.68;their skewnesses are close to symmetry,the mean skew value is—0.22;the kurtosises are narrow,the mean kurtosis value is 1.21.The transportation typeof eolian sands is quite unique,saltalion population predominates the eolian sands there,itsmean value is 85.58%.As the differences of the direction of coastline,development phase,basement topography,plant cover and the divergences of human activites,the types of trans-forming and utilizing;the grain size characteristics of the eolian sands in various coastal sec-tions and sedimentary facies differ in some extent,they are the special results of the eoliansands in various development phases and environments.

关 键 词：风沙 海坛岛 表层沉积物 粒度分布 

分 类 号：P736.213[天文地球—海洋地质]