When is the best time to watch the sea ebb and flow in Qingdao?

To tell the truth, the ebb and flow of Qingdao is nothing to see, and it is not Qiantang River. There is no obvious phenomenon. It took a long time to see the rise and fall of the water level.

Qingdao is a semidiurnal tidal zone, with two high tides and two low tides every day, and the interval between each high tide is about 12 hours.

If you really want to see it, because the position of the moon that causes the tide is different every day, the time of high tide is different every day.

The time of high tide is different every day, and the period is 14 days. So the climax of the next day was delayed by 0.8 compared with the previous day.

Hours (5 1 min), the daily high tide time can be calculated according to the lunar calendar date, and the high tide time is roughly.

The calculation formula is as follows:

Before lunar calendar 16: the date of lunar calendar multiplied by 0.8+3.

After lunar calendar 16: (lunar date-15) times 0.8+3.

Description:

1) unit

The time scale used in the table below is Beijing time, that is, UTC plus eight hours. The tide level is the sea.

The height above the datum of the drawing is in meters. The datum plane is 0.146m below the main horizontal datum plane.

2) Influence of meteorological factors on forecast time and height.

Because the prediction of the time and height of high tide and low tide is only applicable to the average meteorological conditions, it is considered that the actual meteorological conditions

When there is a distance from the average, there may be differences between tidal observation and prediction. If there is an extreme,

Weather conditions, such as tropical cyclones, will be very different.

3) Terminology Notes

Semidiurnal tide: a tidal type with two high tides and two low tides every day. (Shantou is a semidiurnal tide)

Tidal range: the height difference between high tide and the next (or previous) low tide.

High tide: The tide rises to the highest level.

Low tide: The height at which the tide recedes to the lowest water level.

Spring tide: the tide that appears in the new moon or moon every month, and the tidal range is particularly large.

Tide: the tide that occurs in the first or last quarter of each month, and the tidal range is particularly small.

Harmonic method: a method of decomposing tidal changes into harmonics with different frequencies, amplitudes and phase angles (i.e. tidal separation).

Coordinated Universal Time: the official time standard adopted by modern countries. In most practical applications,

Coordinated Universal Time is no different from Greenwich Mean Time.

Chart datum: the datum height for measuring water depth or tide level.

Yellow Sea Datum: The height of land foundation measured in Chinese mainland.

If you are in Qingdao, you can use the information function of Qingdao cable digital TV to check the tide situation of the day in the "weather" column.