Abstract
Caofeidian sand island unique shoal-channel system provides construction conditions for deep-water port.By comparing the underwater topography changes before and after Caofeidian industrial construction to understand the sediment transport and erosion-deposition evolution. Bathymetry results in 2006 and 2012 showed that the deep channel is in good stability. 2 to 3 years later after construction, excepting artificial dredging area, erosion occurs in front of the headland. The sediment is transported to the west of harbor 1 entrance. Seabed sediment controlled by wave comes from the front of the southeast seawall inflection point is transported to the deep channel, some deposits in the east slope and the most is taken away by the deep channel water. All processes above become more weakly now, in the future the sea area in front of the headland will erode weakly, the sea area in the west slope will deposit weakly while in the east slope will erode weakly, and the sea area near the harbor entrance will erode.
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