【摘要】 <正> 北海湾位于北部湾东北部,即东径109°—109°10,北纬21°27′—21°36′之间,湾口朝西南。以北海冠头岭岬角向大风江口东侧划—斜线,湾内总面积约204平方公里。湾顶为南流江三角洲平原,南流江迳流就从这里入海。由于南流江每年携带125万吨泥抄进入湾内,故使海湾日趋变浅变小。根据海图计算,零米等深线以下的水域面积只有25％,而75％为潮间浅滩或水下三角洲浅滩。为了综合开发利用北海湾资源,因而研究它的成因和演化是有现实意义的。更多还原

【Abstract】 Based on geological structure and hydrodynamic conditions, the papper gives a discussion to the origination and development of geomorphic form in Beihai Bay. At the same time, it gives an analysis to the sub-marine delta facies of the Nanliu River and makes a preliminary division for various sedimentary facies. The origination of Beihai Bay bears the following characteristics: (l) Fault structure laid foundation for the development of the Bay. (2) The recent outline of Beihai Bay was formed on the basis of differential erosion taken place as a result of the relative rise of sea level. (3) Various kinds of geomorphic units, such as distribution of sediment, formation of the tidal current deep trough and the sedimentary bodies in submarine delta, were formed after the further reformation under a certain hydrodynamic conditions更多还原