Tidal timetable

The timetable for ebbing tide and catching the sea is as follows:

The first to fifteenth day of the lunar calendar: high tide time = date *0.8.

16th to 30th day of the lunar calendar: high tide time = (date-15)* 0.8.

First of all, the tide rises and falls twice a day, and the time of rising and falling is different every day.

1, it is very important that the schedule of ebb and flow of the tide is made according to the lunar calendar. Many guests don't know this, so the inspection must be wrong.

2. The time when the tide begins to rise is the lowest, and it starts to rise from this point, getting higher and higher.

3. The time when the tide begins to ebb is the highest, and it starts to decline from this time, getting lower and lower.

According to the tidal cycle, it can be divided into the following three categories:

Semidiurnal tide type: a lunar calendar day has two high tides and two low tides. The tidal difference between pre-high tide and post-high tide and post-low tide is almost the same, and the time between high tide and low tide is almost equal (6 hours 12.5 minutes). The Bohai Sea, the East China Sea and the Yellow Sea are semi-diurnal tides in most parts of China, such as Dagu, Qingdao and Xiamen.

All-day tide type: there is only one high tide and one low tide in a lunar calendar day. Such as Shantou in the South China Sea and Qinhuangdao in the Bohai Sea. Beibu Gulf in the South China Sea is a typical diurnal tide area in the world.

Mixed tidal pattern: there are two high tides and two low tides on some days of 1 month, but the tidal range between the two high tides and low tides is quite different, and the time of high tides and low tides is not equal; On other days, there are high tides and low tides. Most parts of the South China Sea belong to mixed tidal type. For example, in Yulin Port, there are diurnal tides on 15 days, and the rest are irregular semidiurnal tides with large tidal range.