粤西海岸全新世中期以来海平面升降与海岸沙坝潟湖发育过程

沙坝湖海岸是一种重要的海岸类型。文章论述了粤西海岸全新世中期以来在海平面升降影响下沙坝湖地貌的发育过程，得出如下结论：距今7000a至5000a．海平面曾上升至＋4m，由于大陆架泥沙的向陆堆积，形成了揭湖拦湾沙坝的后缘高突部分：以后海平面逐步下降至现今位置，它所形成的海退沙楔发育成低矮的向海沙坝和海滩；距今2000a，海平面趋于相对稳定；现今海平面微升，出现了海岸侵蚀。文章还对该地在海平面升降影响下的海岸泥沙运移机制以及海岸高海面堆积和现今海岸侵蚀现象作了解析。

SEA LEVEL CHANGE AND DEVELOPMENT COURSE OF BARRIER LAGOONS ALONG COAST OF WESTERN GUANGDONG SINCE MIDDLE HOLOCENE

Barrier lagoon coast is an important kind of coast. Taking the coast of western Guangdongfor example, the paper expounds the developmnt course of barrier lagoons under the influenceof sea level change in this area, and comes to the following conclusions. 7 000 yeare before present, the sea level had risen to 4m. Sand from the continental shelf deposited towards land, forming projecting part at the back of the barriers across haymouths of lagoons. Thereafter, sea level fell grandually to the present level, the regressive sand wedges thus formed grew into low barriers and beaches towards sea. 2000 years before present, the sea level tended towards relative stability. Atpresent, the sea level is rising slightly, resulting in coast erosion. The paper also makes an analysis on the migration mechanism of coastal sand, coastal deposit at high sea level and present coastal erosion under the influence of sea level change.