北仑河口的表层沉积物类型及其分布特征  

Characters of grain sizes on the surface sediments of Beilun Estuary

作　　者：房旭东[1] 许江[1] 

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《台湾海峡》2010年第1期81-88,共8页Journal of Oceanography In Taiwan Strait

基　　金：广西908专项评价资助项目(GX908-01-09)

摘　　要：北仑河口84个表层沉积物样品的分析结果表明,该河口有含砾砂、砂、粉砂质砂、砂质粉砂、粉砂、砂-粉砂-粘土、粘土质粉砂等7种沉积物类型,并具有自西北往东南逐渐变细的特征;分析结果还表明北仑河口可划分为近口、河口和口外海滨3个沉积区,近口区以河流作用为主,河口区粗颗粒沉积作用主导,而口外海滨区则主要受到两种营力的共同作用.This paper analyzed the grain size of 84 surface sediment samples from the Beilun Estuary. It indicates that the sediments were composed of 7 species i.e. gravel sand, sand, clayey sand, sandy clay, clay, sand-siltclay and silt clay. Among them the most important is sand. The sediment particles become finer from the northwest to the southeast of the estuary. We also found that the sedimentary zones of Beilun Estuary can be divided into the nearshore area of estuary, estuary and offshore area of estuary. The main dynamic factor in the near shore area of estuary is the river runoff, the dominant agent affecting the estuary area is coarse particle deposition and the offshore area in the estuary is mostly affected by two agents.

关 键 词：海洋地质学 沉积物 粒度 北仑河口 沉积分区 

分 类 号：P534[天文地球—古生物学与地层学]