本文通过对吕四近岸波浪、水流和岸滩变化的观测分析,认为:本区海岸侵蚀的主要原因是泥沙的来源减少,浅滩泥沙在风浪作用下易于掀起,在以落潮流为主的浅滩水流的携带下向外海搬运。浅滩泥沙输移方向自西向东。基于海滩不断下蚀的特点,考虑到波浪、水流对海滩侵蚀均起着重要作用,建议采用分离式离岸堤与丁坝布置相结合的保滩促淤工程。 Based on the observation and analysis of the waves, currents and beach changes in the coastal area of ​​Lu Si, it is considered that the main reason of coastal erosion in this area is that the source of sediment is reduced, the sediment of the shallow beach is easy to be set off under the action of storms and waves, Shoal of water carrying under the sea to move. Shoal sediment transport direction from west to east. Based on the characteristics of continuous erosion of the beach, taking into account waves and currents play an important role in beach erosion, it is proposed to adopt a combination of detached offshore embankment and dam arrangement to promote siltation.