Tide

Time and tide wait for no man

Tidal reef,

High tide……

Why tide?

The Moon pulls on the Earth and the Earth pulls on the Moon. They are gravitationally linked so that one face of the Moon always faces us and the water in our oceans is attracted upwards towards it by its gravity. On the other side of the world there is also a rise in the waters because there is less gravitational pull on the oceans because they are futher away from the moon…..

Why high tides?

The water is pulled up so far by the moon, but as water flows inwards towards the land as the tide comes in it can also rise further if it is pushing into a narrowing area such as a gap between two islands or into the narrowing channel of a river or stream. In this case sometimes the water can overtop the banks if it is a particularly high tide, such as a spring tide. The water will rise higher if it is forced into the estuary by wind as well as tidal forces.

One third of the world’s population live on various coast lines around the world. If the world continues to warm up then these people will be at risk from the rising tides caused by global warming. Many countries have built costal defenses but these are being damaged every year during stormy weather. Replacing the damaged protective barriers is being abandoned in some places as not cost effective and some costal salt marshes are being recreated to protect the land.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s