华南砂质海滩的动力地貌分析  

Analysis on morphodynamics of sandy beaches in South China

作　　者：蔡锋[1] 苏贤泽[2] 曹惠美[2] 夏东兴[3] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266003 [2]国家海洋局第三海洋研究所,福建厦门361005 [3]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋学报》2005年第2期106-114,共9页

基　　金：福建省自然科学基金资助项目(D0210018)

摘　　要：为探讨华南砂质海滩的动力地貌学特征,对不同地理岸段不同地貌形态的8 个沙滩剖面于冬、夏季进行现场重复调查和室内分析工作.据此,通过对华南海岸带地质构造、地貌和现代海岸动力环境地域变化的分析,将华南沿海砂质海岸划分为岬湾岸、沙坝潟湖岸和夷直岸三种基本海岸地貌类型,并且从滩面倾向、海岸动力环境影响、季节冲淤变化趋势和滩面沉积物粒径、坡度的动力响应等方面探讨砂质海滩的动力地貌,得出其受制于多种环境因素的影响,其中地质构造背景和海平面变化为大尺度的砂质海岸地貌的发育奠定了基础,而全新世海侵海平面相对稳定后,海岸动力条件的塑造起着决定性的影响,浪潮作用指数是其中重要的影响指标.Eight profiles of sandy beaches distributed in different geographical coast sections and different coast geomorphologies were repeatedly surveyed on the spot in winter and summer and analysed in laboratory to discuss the morphodynamics of the sandy beaches along the coast of South China. On the basis of the research, combined with the analysis on the coastal geological structure, geomorphology and the changes of modern coastal dynamical environments with geographical location, the sandy coast of South China is differentiated into three basic types of coastal geomorphology: cape-bay coast, barrier-lagoon coast and straightened coast. The morphodynamics of the beaches were studied through the analysis on the beach incline, coastal dynamic changes, the seasonal scouring-silting changes tendency, the sediment grain-size of the beach face and the dynamic response of beach slope. The results show that the morphodynamics was enslaved to many environmental factors, in which geological structure background and sea-level changes played an important base for the development of the geomorphology of sandy beaches in a large-scale distribution. After the Holocene transgression, the sea-level was relatively stable, the moulding action of modern coastal dynamic condition became decisive, and the index of tide-wave was an important factor.

关 键 词：华南海岸 砂质海滩 动力地貌 

分 类 号：P737.14[天文地球—海洋地质]