What does the trend mean? Geography Baidu encyclopedia

Tidal current has the functions of accumulation and combined transport.

Tidal current is different from other kinds of ocean currents and waves, and it moves directionally for a long time, and its velocity is also slow, so most of the transported substances are fine sediment and silt, which are transported in suspension. Tidal current makes fine sediment move to the shore, while coarse sediment moves to the sea.