河口冲积平原上，全景航拍视角展现了沿岸流沙塑造河口的景象。泥沙堆积形成了河道入海处的沙嘴屏障，是平坦

d footage captures longshore drift sands shaping river mouth on coastal alluvial plain. Surface movement, shoreline form, and water contrast give the frame clear natural structure. Height and wide coverage help separate patterns, routes, and textures without visual clutter. It works well for travel, geography, nature, and environmental storytelling.