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中文摘要：
粤西博贺湾地区发育一典型的沙坝渴湖海岸体系。通过对比分析，1932～2000年，博贺渴湖面积减少45．3％，人类活动已成为影响该区海岸演变的主导因素；滩涂围垦、海岸采沙与水产养殖等人类活动加剧了沙坝海岸的侵蚀后退，且使得渴湖面积迅速减少，不断淤浅萎缩，大大加快了海岸体系的演化进程。根据钻孔地层剖面和^14C测年资料分析，对该区沉积环境演变过程的研究结果表明，自晚更新世中期以来，博贺沙坝渴湖海岸体系经历了初步形成、遭受破坏、再次形成、发育、现代演变等5个主要阶段。
英文摘要：
There is a typical barrier-lagoon system in Bohe area in the west of Guangdong Province. According to the contrast between different maps and the dynamical conditions, the area of Bohe Lagoon had reduced by 45.3 % from 1932 to 2000 and human activities in the coastal zone, such as inning, sand dredging and aquiculture, have brought great effects on the coastal system, which has accelerated the barrier erosion and lagoon evolvement. Based on the data of drilling bores, ^14C dating and the former achievements, the formation and evolution phases of the barrier-lagoon system are studied.
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