北长山岛、南长山岛及庙岛之间海域由淤积变为侵蚀，最大侵蚀速率达8.1cm/a，侵蚀速率会逐年减小，最终达到冲淤平衡状态。
The sea between the South and the North Changshan Islands , Miao Island is from siltation to erosion . Maximum erosion velocity reaches 8.1cm/a . Erosion velocity reduces year by year and reaches balance at last .
南长山岛