Super Moon spring tide

Equinox Spring tides

Why are spring tides near the equinoxes higher than a Super Moon spring tide (when a full moon is as close to our planet as it normally gets)? Why four tides in one day?

Spring tides are named because the height of the tide springs back from low tides to spring up to a high height tide. Spring tides are not just a spring seasonal phenomenon.

Equinox Spring tides

Why do our planets oceans and seas normally have 2 high tides and 2 low tides per day, when the Earth only rotates once during a day?

Extra high tides, known as spring tides, have flowed onto quaysides and changed the waterways across the Norfolk coast this week…

Spring tides happen at least once a month, but are greatest in March and September, at times known as the equinoxes. When they overlap with a full or new moon, tides can reach record levels.

On August 30, a new moon came at its orbit’s closest point to Earth, making it a super moon, and increasing the spring tide’s height. The next spring tide falls on September 30, and is predicted to be slightly greater than the ones this weekend.

Extra high tides are followed by the lowest tides, before they move toward their point of smallest difference, known as a neap tide.
Extra high tides wash over coast | Eastern Daily Press

Only 1 high gravity tide and 1 low gravity tide might be expected at the same location.

neap tide

A spring tide: popularly known as a King Tide refers to the ‘springing forth’ of the tide during new and full moon. Spring tides occur twice each lunar month all year long, without regard to the season.

A neap tide: seven days after a spring tide refers to a period of moderate tides when the sun and moon are at right angles to each other.
What are spring and neap tides? | National Oceanic and Atmospheric Administration

Electromagnetic spring tides?

Are all tides and changes in tidal ranges due to electromagnetic forces flowing and created between the Sun, Moon and Earth system and circuit?

Super Moon spring tide

During full or new moons—which occur when the Earth, sun, and moon are nearly in alignment—average tidal ranges are slightly larger. This occurs twice each month. The moon appears new (dark) when it is directly between the Earth and the sun. The moon appears full when the Earth is between the moon and the sun.

In both cases, the gravitational pull of the sun is “added” to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are a little higher and low tides are a little lower than average.
What are spring and neap tides? | National Oceanic and Atmospheric Administration

UPDATE 30/9/2019: Equinox tide and tidal surge

There are also tidal river flooding warnings in place for the tidal River Waveney from Ellingham to Breydon Water and the tidal River Yare from Thorpe St Andrew to Breydon Water, with high water levels expected in Brundall and Reedham. Meanwhile the flood gates at King’s Lynn will be closed on Monday morning and South Quay will also be shut.

The flooding coincides with high spring tides around the coastline, which are expected to peak on Tuesday. The Environment Agency said high tides, a tidal surge and strong northerly winds were likely to make water levels higher for the evening’s tide
Flood alerts around coast following heavy rain | The Eastern Daily Press