When the sun and moon are aligned with the earth there is a strong gravitational pull. This causes high high tides and low low tides which increases the tidal range. There are also increased tidal currents. They occur twice a month around a new/full
3 of 13
What are neap tides?
Sun/moon are at right angles to the earth - less gravitational pull. High tide is less, low tide is higher - smaller tidal ranges. Occur when moon is at its 1st and 3rd quarter
4 of 13
What does it mean if there is a high tidal range?
There is a wide zone of wave attack
5 of 13
What happens when waves have friction with the sea bed?
Base of the waves slow down.The upper part of the wave plunges forward and the wave breaks onto the beach - height and steepness of wave (1:7)
6 of 13
Energy of waves depends on?
The fetch, wave strength and length of time it is blowing
7 of 13
What effects the rate of erosion?
Beach presence, human activity, wave steepness and breaking point, sea characterisitcs, geology and shape of coastline
8 of 13
Physical causes of coastal flooding
Management of coastal systems, management of river systems, building on coastal lowland and reclamation of coastal lowland
9 of 13
Human causes of coastal flooding
Tsunamis, strong onshore winds, low pressure atmosphere, high rainfall and tidal currents and surges
Comments
No comments have yet been made