At the beginning, the sediment headland caused by offshore breakwater was closed to the offshore bank and thus then extended both from land to sea and from sea to land.

• 离岸堤所造成的淤积沙嘴是开始紧靠离岸堤的背后，后来淤积沙嘴又从岸向海、从离岸堤向陆同时淤长。