一、潮汐及其成因潮汐是海水的一种周期性涨落运动 .一般情况下 ,每昼夜海面有两次涨落 ,一次在白天 ,一次在夜晚 .在潮汐涨落的每一周期内 ,当水位上涨到最高位置时 ,叫做高潮 ;当水位下降到最低位置时 ,叫做低潮 .相邻高潮与低潮的水位差叫做潮差 .从低潮到高潮过程中 ,水位 1. Tides and their origins Tidal waves are a cyclical fluctuation of seawater. Under normal circumstances, there are two fluctuations in the sea surface every day and night, once in the day and once in the night. During each cycle of the tide, When the water level rises to its highest position, it is called a climax; when the water level drops to the lowest position, it is called a low tide. The difference between the adjacent climax and low tide is called tidal range. From the low tide to the climax, the water level