湄洲湾中央深槽及白牛浅滩的成因探讨  

APPROACH TO THE FORMATION CAUSE OF THE CENTRAL DEEP CHANNEL AND THE BEINIU SANDS IN MEIZHOU BAY

作　　者：潘定安[1] 汪思明[1] 沈焕庭[1] 

机构地区：[1]华东师范大学河口海岸研究所

出　　处：《地理学报》1994年第1期55-63,共9页Acta Geographica Sinica

摘　　要：通过流场和地形特征的分析，研究湄洲湾中央深槽及白牛浅滩的形成机理。从湾顶延伸至口外的中央深槽，在半岛、岛屿和岬角控制下，由潮流塑造而成，但发育过程各段不尽相同，有涨潮流作用为主、落潮流作用为主和涨落潮流共同作用的三种类型。白牛浅滩的地貌形态，似沙嘴，如沙脊，又像独立的堆积体，形成模式与众不同，是湄洲湾中一个特殊的浅滩。Meizhou Bay is located on the coast of Fujian Province. There are many peninsalus, capes and islands. The submarine relief is more complicated. The Central Deep Channel is not only wide but also deep. The Central Deep Channel has three sections,which are the south sections, middle section and north section. Shoals usually develop along the coast or around the islands. Beiniu Sands is located in the zone where the south section and the middle section are connected in the Central Deep Channel. Tidal current is a major force to mould the submarine relief in the Meizhou Bay. To reveal the dynamic mechanism of the formation of deep channels and shoals, a numerical simulation of the flow field in Meizhou Bay is applied in this paper. The numerical model adopts Jan J. Leendertse's geostrophic nonlinearity two-dimension flow field model. It is one of the major bases to analysis the formation of the Central Deep Channel and the Beiniu Sands. There are four-group peninsulas and islands in the Meizhou Bay, which can narrow the bay and control current action. The link line between the four-group peninsulas and the islands is a boundary line between the Central Deep Channel and the shoals. The major dynamics moulding the deep channel at the upper stream of the south section of the Central Deep Channel is the flood current. it belongs to the flood channel. At the lower stream the channel is moulded by ebb current, and it is an ebb channel. The middle section of the central Deep Channel is domained by ebb current, which is the major dynamics to mould the deep channel which is belongs to the ebb channel. At the north section of the Central Deep Channel. the major dynamics on the north shore is the flood current, and it is the ebb current which moulds the south shore. Thus,the evolution processes of the Central Deep Channel are different at various reaches. the dynamic mechanism can be divided mainly into three kinds including flood. ebb currents and combination of the two. In the Beiniu Sands area. there are a slow flood flow an

关 键 词：湄洲湾 槽沟 浅滩 流场 成因 

分 类 号：P736.14[天文地球—海洋地质]