海岸带是海洋与陆地交互作用的地带。海岸带的地貌和水文特征按潮汐海面可分为三带:高潮位以上的海滨,包括沿岸堤平原和海蚀阶地等,它们是古海洋作用的遗迹,一般不受现代海洋动力的影响,高潮位与低潮位之间的潮间带,它们随涨落潮而周期性地被淹;以及低潮位以下一直到波浪作用极限深度的水下岸坡,包括浅海和泻湖水域,属于水下环境。 Coastal zone is the sea and land interaction zone. Coastal landforms and hydrological characteristics of the tidal sea can be divided into three zones: the climax above the beach, including the coastal dike plains and sea-level terraces, which are ancient marine relics, generally not affected by the impact of modern marine power, high tide bit And the low tide zone, they are submerged periodically with the ebb tide; and underwater banks below the low tide level up to the wave depth limit, including the shallow sea and lagoon waters, are underwater.