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华南海岸沙坝湖型潮汐汊道主要分布在小潮差岬湾海岸段。汊道口门基本地貌单元有口门深槽、落潮三角洲、涨潮三角洲、内弯沙嘴等，其形态特征与海岸动力及泥沙条件有关。汊道口门迁移、落潮主水道迁移、冲流坝和水道边缘坝向岸迁移和并岸，是汊道口门地貌演变的主要模式并具周期性特点。 湖港湾大规模围垦堵海或注入港湾的河流改道直接入海，这些人类活动可能导致汊道口门急剧变化和航行条件恶化而必须进行整治。
South China coast Shaba Lake tidal lanes are mainly distributed in the small tide head Cape Bay coast section. There are gated deep troughs, ebb tidal delta, high tide delta, inner elbows, etc. The morphological characteristics are related to coastal power and sediment conditions. The migration of riparian gates, the migration of ebb main channel, the migration to the shore of the dikes and the marginal dams of the watercourse are the main modes of evolution of the ogandou gate topography and have periodic characteristics. Large-scale reclamation of lake horizons or river diversion to the harbor directly diverted into the sea. Such human activities may lead to drastic changes in the crossing and deteriorating navigation conditions that must be rectified.