MindMap Gallery Coasts
Coasts are dynamic and diverse environments that are shaped by the interaction of land, sea, and various natural processes. This mind map aims to explore the different aspects of coasts. By exploring this mind map, you will gain a comprehensive understanding of coasts and the various factors that contribute to their uniqueness. Whether you are a student studying geography, a coastal enthusiast, or simply interested in learning more about these fascinating environments, this mind map will serve as a valuable resource to explore and understand the complexities of coasts.
Edited at 2022-10-05 07:12:42Coasts
Sand Dunes
Beach or dessets are fromed in places with lots of wind. A dune will from from a dune embryo which is a small dune that froms on a rock so that it can be held up. After it's there more sand will be collected and it will from a dune. Vegitation may grow in them to keep them stable and help redcue erosion.
Soft defences
Beach Nourishment: Dumping sand and other beach sediment onto the beach so that the beach will be like before. Advantges: it will look good as it's the same stuff on the beach as before and it will icnrease tourist ammounts. Disadvantges: it is very expesive and the sand will need to be constantly replaced from somwhere else.
Reprofiling: When sediment is moved from the top of the beach to the bottom of the beach. Advantges: It's cheap and it is easy to do. Disadvantegs: Only works if you have sand at the top and will need to be done constantly.
Dune nourishment: This is when marram grass is planted on the dunes to grow there roots and make them stronger. Advantges When It's cheap and the coast will look. Disavantges: Can be damged while growing and waste the product and areas have to be zoned off from the public reducing tourists.
Hard defences
Gabions: This is when boulders are piled on each other and are strapped down with metal cages so that they dont move. Advantges: Take in lots of wave streanth and allows build up on beach. Disadvantges: Can be expesive to move and can look ugly.
Groynes: This is when wooden barries are built across the beach to stop the movemnt of sedment along the beach. Advantges: Prevents long sure drift and dosent look bad, Disadvantges can be ugly and cost alot.
Sea wall: A large wall used to stop erosion. Advantges: Very good at stopping erosion andd can also prevent flooding if it goes above the land. Disadvantges: Very expesvie to build and can loom ugly and make tourstis not visit.
Beach Movment
Long shore: drift is when sedmint is moved along the beach. How? This happens when the prevaling wind is moving along the beach in either direction. Beaccuse of the swash and backwash the sedmint will be pulled out and moved along beacuse of the wave direction, this will keep happening and move it to the end of the beach.
Transportation: Movment of rocks and minerals in the sea. Solution - when minerals in rocks like chalk and limestone are dissolved in sea water and then carried in solution. The load is not visible. Suspension - small particles such as silts and clays are suspended in the flow of the water. Saltation – where small pieces of shingle or large sand grains are bounced along the sea bed. Traction – where pebbles and larger material are rolled along the sea bed.
Beach Erosion
Erosion is the wearing away of the coastline normaly due to destructive waves and acid in waves and rain.
Hydraulic action - this is the sheer power of the waves as they smash against the cliff. Air becomes trapped in the cracks in the rock and causes the rock to break apart. Abrasion - this is when pebbles grind along a rock platform, much like sandpaper. Over time the rock becomes smooth. Attrition - this is when rocks that the sea is carrying knock against each other. They break apart to become smaller and more rounded. Solution - this is when sea water dissolves certain types of rocks. In the UK, chalk and limestone cliffs are prone to this type of erosion.
Waves
Constructive waves: These waves have a strong swash and a weak backwash, the waves are also shorter and very far apart.
Destructive waves: Strong backwash and weak swash, unlike Constuctive waves they are taller and close together.
Mass Movements
Mass Movement : This is when a lare amount og sedmint moves downhill beacuse of gravity.
Rock Fall: This is when bits of the cliff fall of ussaly due to freeze-thaw.
Mudflow: Saturated soil flows down a slope in a stream due to gravoity and rain fall sokeing into the ground.
Landslide: When lare blocks of rock slide downa hill
Rotational slip: This is when Saturated soil slumps down a curved surface.
Weathering
Chemical weathering: This is when rainwater and sea water with weak acid in it are able to break rocks like limestone and chalk over time.
Biological weathering: This is when plant life grows into rocks, after a long time the roots will grow and brak the rocks forming cracks, when these get bigger the rocks will break apart.
Freeze-Thaw weathering: This is whencracks in rocks are filled with water and then the water freezes and expands, as it expands it breaks the rock and then more water goes in and this repeats till the rock falls apart.
Head Land
At the headland There are 4 main structres. Caves: These for after weathering at the sea level from hydrolic action and freeze thaw weathering in small cracks which get bigger and bigger till a whlo cave forms. Arches: This is after the cave falls and leaves a gap through the headland which is an arch over the sea. Stacks: This is afetr the connection above the arch collapses and leaves a standing pillar of land. Stumps: Formed when the stacks fall over and leave a small bit of land on the ground.
Spits and Bars
Spit: A spit is a long bit of land streaching out from the edge of a beach where it turns, it is formed due to long shore drift when the sediment is pushed round the coner of a beach and keeps extending outwards. As it gets longer it will bend and form a hook shape, on the insdie salt marshes will form and mud is left which creates a shelterd esturay for plants to grow in.
Bar: A bar is formed from long shore drift when a spit goes from one beach across a gap (normaly a lagoon) to another beach. When it reachs the other side it is a bar and this can drain or increase the size of the enclose lagoon.
Dorset Coast
Studland has large amounts of visitors 25,000 on somedays, 90% of them come by car. They also have a huge oil ground that used to make 105,000 oil barrles a day but now down to 15,000.
Oil: The companys have to do thing like build short buldings and paint them so they arent noticed, they also have to completly clear up the land after finishing with all the oil.
Toursim: Lots of rubbsih is made about 4,500 kilograms needs to be cleaned a day. They also run out of parking spots due to high visitors and horse can only come early as many people dont like them.
Enviroment: Many divers need to swim around and clear up rubsih to keep the sea life healthy and also huge amount of plastic and rubbish must be cleand from the beach each day.
Changing Coast line: Each year 1.5 meters of beach is made at the northen end but 3 meters can be lost.They use many stratiges like wooden planks, gabions, beach huts and manged retreat. 240 priavte huts.