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人们通过长期的实践、观察,发现海水有规律的涨落,而涨落的时间和高度又有着周期性的变化,由此人们把这种海水涨落的现象叫潮汐。而随着海水的涨落、水位的升降,出现了海水的水平流动,这种海水流动的现象叫潮流。 海水有周期性涨落规律,如在每日里出现两次大潮和两次小潮。通过长期实践、观察,发现每日的高潮大多出现在月亮的上、下中天(即过当地子午线时)前后。低潮时间则在月出月落前后,并且每日的高
Through long-term practice and observation, people find that there is a regular fluctuation of the sea water, and there is a cyclical change in time and height of the fluctuation. Therefore, people call this phenomenon of sea water fluctuation a tidal wave. With the rise and fall of the sea water, the water level rises and falls, the horizontal flow of the sea water appears, and the phenomenon of the sea water flow is called the tide. There are regular fluctuations of sea water, such as in the daily occurrence of two tide and two small tide. Through long-term practice and observation, most daily climaxes were found before and after the moon, the next transit day (ie, passing over the local meridian). Low tide time is before and after the moonrise, and daily high