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:recycle: GEOGRAPHY :recycle: (COAST (EROSIONAL LANDFORMS AT THE COAST…
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GEOGRAPHY
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COAST
WAVES
LONGSHORE DRIFT
A longshore drift is when the rocks on the beach is moving back and forward by the wind.
The sequences
The prevailing wind affects the movement of water
The waves approach the shore at an angle
The swash moves the rock up the beach at an angle
The backwash drags the rock back straight down due to gravity
Slowly the rock moves along the beach
TWO TYPES OF WAVES
DESTRUCTIVE
A destructive wave have a weak swash, but a very powerful backwash, this is because normally if the gradient of the beach is steep the waves can approach at a higher angle and that's why destructive wave are higher than constructive
CONSTRUCTIVE
A constructive wave normally have a strong swash but a weak backwash, also it is the type of waves surfers would want to surf because it have longer wave lengths, which mean they can surf longer on the waves.
DIAGRAM OF WAVES
EROSION/WEATHERING
EROSION TYPE
HYDRAULIC ACTION: When waves crash into the rocks and break up the coast due to high pressure within cracks
ATTRITION: When pieces of eroded material smash together breaking each other down
SOLUTION: When weak acids in the sea water dissolve minerals from the rocks into the water
ABRASION: When eroded material is thrown at the coastline breaking down the rocks
WEATHERING TYPE
CHEMICAL WEATHERING: When the weak acid in rain or river water dissolves the rock away
ONION SKIN WEATHERING: When the heating and cooling of rock expands and contracts the rock, causing its outer layers to crack and break away
BIOLOGICAL WEATHERING: When the roots from trees push into the rock and soil and break it up
FREEZE THAW WEATHERING: When water gets into cracks, freezes, causing the crack to expand and gradually crumble away
EROSIONAL LANDFORMS AT THE COAST
BAY: are parts of a coastline that cuts into the land. They are made of soft rocks. This means they are more easily eroded
they have features such as beach
HEADLANDS: are parts that stickes out into the sea. They are made of hard rocks. This means they are less easily eroded. They have features such as cliff
FAULT: a crack in the headland due to erosion making a weakness of the headland exploited
CAVE: As the fault is widen, a cave is created as more erosion occurs
ARCH: when the caves are eroded through the cave/headlands, it will make an arch
STACK: Eventually, the roof of the arch will fall and leaving a stack, which is a tall rock.
STUMP: After that, the stack will eventually erodes the bottom of the stack making it collapse by the waves
REMINDER THIS PROCESS HAPPENS OVER MILLIONS OF YEARS
COAST 2
EROSIONAL LANDFORMS AT COAST
WAVE CUT PLATFORM
First, at high tide the waves attack the base through the process of corrosion,...
WHAT FACTOR AFFECT THE SIZE OF A WAVE
Land Slide
Rocks falling in water, and the size would base on how big is the rock
Earthquake
Leads to tsunami (sometimes)
Wind
Hurricanes
Low wind lead to low wave and High wind leads to big wave
