我国不但海岸线漫长,而且种类繁多,这对发展我国国民经济、开展对外贸易、巩固国防和开发观光旅游事业,都有极其重要意义。但由于种种原因,这些岸线不断地进行着沧桑变化,有的海岸淤,有的海岸冲。所有这些现象早就引起了有关人士和部门的注意。 Our country not only has a long coastline, but also a large variety of its own. This is of great significance to the development of our national economy, conducting foreign trade, consolidating national defense and developing sightseeing and tourism. However, due to various reasons, these coastal areas are constantly undergoing vicissitudes, some coastal silt, and some coastal red. All of these phenomena have long drawn the attention of people and departments concerned.