Abstract
Using the principal component analysis, hierarchical cluster analysis and non-metric multidimensional scaling analysis, 10 factors about coastal plain shape and hydrodynamics of 47 arc-shaped beaches in South China were analyzed, aiming to study the influencing factors and classification spectrum of arc-shaped beach configurations. The results show that: (1) the planform geometry of South China arc-shaped coast is mainly controlled by antecedent geologic conditions (with exception of bay orientation), hydrodynamic conditions (wave and tidal range) and sediment supply; (2) the arc-shaped beaches in South China can be divided into 4 groups, witheach group having several sub-classifications. The first group is meso- and macrotidal coasts; the second group is wave dominated microtidal beaches; the third group is geological structure controlled large arc-shaped beaches; and the last group represents a unique type of arc-shaped beach; (3) non-metric multidimensional scaling analysis reveals the effects of morphodynamic factors on the coastal shape and the types, which shows the categories are objective. These conclusions will be helpful to the arc-shaped coasts processes research and engineering constructions.
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