DISTRIBUTION PATTERN OF THE SURFACE SEDIMENTS IN SOUTHERN BOHAI STRAIT AND CONTROLLING FACTORS
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摘要: 利用渤海海峡南部海域208个表层沉积物样品的粒度分析测试结果,结合矿物组分及动力条件,分析了沉积物的分布特征及其控制因素。结果表明:(1)表层沉积物类型丰富,以粗粒沉积物为主,含砾组分分布范围较广,主要位于岛陆之间水道、基岩海岸和登州浅滩附近海域;(2)粗粒沉积物分选差-极差,细粒沉积物分选好,偏态系数以正值为主,且东部海域高于西部海域;(3)东部海域表层沉积物为陆源残留沉积产物,西部海域为黄河及莱州湾西南部河流输入与东侧山东半岛岛屿冲刷供给的过渡区;(4)南部砂质海岸沉积物受波浪作用控制,外侧海域、岛陆之间水道及基岩岬角海域沉积物受潮流作用控制。Abstract: Based on the grain size data of 208 surface sediment samples in the southern Bohai Strait, combining the mineralogy of sediments with the water dynamic conditions, this paper discussed the distribution pattern of the surface sediments and its controlling factors. The results show that:1) Surface sediments vary in grain size, but are dominated by coarse-grained sediments. Pebbles are widely distributed in the waterways between the islands and land, the rocky coasts and the subtidal area near the Dengzhou Shoal. 2) The sorting of coarse sediments is generally poor or very poor, instead, the fine-grained sediments are well sorted. And the skewness is generally positive which is higher in the east region compared to the west. 3) Terrestrial residual sediments occur in the east of the study area, while the west of the study area is a transitional zone of the fluvial deposits of the Yellow River and other rivers to the southwestern Laizhou Bay and the eroded debris from the islands along the Shandong Peninsula; 4) The grain size distribution in the southern beach of the study area is controlled by waves, in contrast grain size distribution in offshore areas, waterways between islands and the land and the areas near the rocky headland is mainly controlled by tidal currents.
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Keywords:
- surface sediment /
- grain size parameters /
- controlling factors /
- The Bohai Strait
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