autumn test one - coasts Flashcards
how does geology affect dorset coastline
three Major rock types: chalk,weldon sands and clays and limestone
-more resistant rocks from headlands, such as Destin head and the foreland where is Weaker weldon clays form bays
-Woolworth, which formed by varying resistance as it eroded back into the limestone, enclaves and eventually hit the chalk, and no longer road back so eroded sideways
-In the future st adlehelms head may turn into an island of Portland limestone and coves, will join and continue eroding sideways
-Structure affect it as a maybe faults and joints, which can be taken advantage of
how does the shape of the coastline influence of landscape?
-Causes waves to refract as they approach a coastline as an angle. They refract at headlands and bays and concentrate their energy, which increases erosional on headlands
-Shouted bays like Swanage Bay. The energy of waves are dispersed which needs to sediment deposition, which leads the formation of coastal landform, such as cliff beaches and spit.
how do wind waves and tides affect the shape of the coastline
-wave energy is generated from frictional drug of winds, moving across the ocean surface, higher windspeeds, mean, larger waves that possess more energy
-If the wind blows out a bleak angle to the coast, it drives waves towards the beach and angle also known as longshore drift which transports sediment along the coast
-As Dorset is a high energy coastline, due to being exposed to Southwest prevailing winds, it’s subject to a lot of waiver erosion which increases hydraulic action on cliff face as an event eventually leads to doodle door forming
-will eventually collapse from weathering on the limestone
-Dorset is exposed to large macro tile ranges, which influence where wave action occurs. It increases erosion and scouring in the large intertidal zones.
in the future what will happen to dorset coast
st adlhelms head may turn into and island of portland limestone
-coves will join and continue eroding sideways
