Question

help...pleas
Compare neap and spring tides. Give two comparisons in your answer.

Answer 1

The moon gravitational pull amounts for about 70 percent of the tide. The sun is responsible for the resting 30 percent. When the moon and the sun are on the same or opposite sides, they work in harmony and increase the height of the tide. This is when we call it the spring tide. At the first quarter and last quarter, their gravitational pull work in opposition and this is when we have the neap tides.

The spring tides don't happen necessarily on the day of the new and full moon. Sometimes it happen as late as three days after. There is a slight delay.

The height of the tide is calculated from many constituents. The position of the moon and sun are the most important but several others like the declination of both, etc. are also playing a role. In the old days, the cycle of every constituents were made in a clockwork mechanism that was lifting a gauge. The result could then be read and a table of the tides could be computed. Today, of course, this is done by computers.

The tide is usually computed for a place of reference. In the UK, it is the harbour of Dover. Then a table of time difference with Dover is printed for each harbour. Co-tidal charts also exist. Those show line of equidistance for the time delay with the place of reference and the actual tidal difference. Those have to be added to what is known as the Chart Datum, i.e. the lowest low tide that is used to indicate soundings.

Answer 2

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