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渤海是我国一个半封闭的内陆浅海,面积只有8万多平方公里.海底坡度平缓,平均坡度仅26秒.水深较浅,平均水深为20米.其周边除渤海东部沿岸为岩质或砂砾质海岸外,西部和西南部的渤海湾、莱州湾均是由细粒物质组成的粉砂质淤泥质海岸.渤海沿岸分布有许多重要河流,其中主要有黄河、辽河、滦河、海河、小青河.它们将大量的陆源碎屑物质搬运沉积于渤海之中,形成渤海海底现代沉积物是以陆源碎屑为主的基本特征.
Bohai Sea is a semi-enclosed inland shallow sea in China with an area of more than 80,000 square kilometers. The slope of the seabed is gentle with an average gradient of only 26 seconds. The water depth is shallow with an average depth of 20 meters, except for the rocky or gritty surrounding of the eastern coast of the Bohai Sea Besides the coasts of the sea, the Bohai Bay and the Laizhou Bay in the west and southwest are silty silt coasts composed of fine-grained materials. There are many important rivers distributed along the Bohai coast, including the Yellow River, Liaohe River, Luanhe River, Haihe River, small Qinghai.They transport a large amount of terrigenous detrital material to the Bohai Sea to form modern sediments in the Bohai Sea, which are mainly characterized by terrestrial detritus.