海面碧波万顷、一直处在动荡起伏的状态中。其中,最引入瞩目的是海浪,它一阵阵地向近岸传来,并在海岸边破碎或卷倒。稍长时间观察,人们看到海滩、海岸带在一段时间内裸露出来,而在相继的一段时间内又被淹没,这就是潮汐的涨落现象。由地震诱发的海啸,由风暴天气引起的怒涛和风暴潮,来势凶猛,往往造成灾害。还有多种波动叠置在海 Sea bibo million hectares, has been in turmoil in the state. Among them, the most notable was the waves, which came in waves to the nearshore and were crushed or torn down by the coast. A little longer observation, people see the beach, the coastline exposed in a period of time, but in a period of time has been submerged, and this is tidal fluctuations. Tsunamis caused by earthquakes, fierce waves and storm surges caused by stormy weather are often catastrophic. There are many fluctuations superimposed on the sea