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hunstanton sediment

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Introduction

Cliff Profile hunstantons cliffs are vertical they are made of white lime stone the next layer down red chalk and the bottomm layer is carstone. The cliffs of hunstanton are a natural defence for the coastline. The cliffs are weatherd away by plants ,rain ,freeze thaw ,chemicly ,onion skin. the only protection a cliff gets is from is't own erosion when a part of the cliff falls from erosion the pile of boulders protectes the cliff against the sea this is called toe armour . Below is a very good image of a typical hunstanton cliff. The cliffs can retreat by two different methods they are erosion and weathering. Erosion is caused by the sea for example hydraulic action this is the brute force of the waves hitting the cliff face . Weathering is caused by many things for example tree roots push the rock apart and made the cliff weak and then all it takes is a bird to nudge that peice of rock while nesting and the cliff will fall. ...read more.

Middle

There are many ways of doing so, I will describe them. Some of them are used in Hunstanton and I will show what they do to the cliffs and beach, and the adverse affects (if there are any). Recurve sea wall The old sea walls were straight up and when waves hit it with force, the waves came over the top. The impact of waves hitting straight on the face of the concrete, was wearing it away. With a curved sea wall the energy of the wave is reflected and the wave just goes up the curve and falls (due to gravity). This stops the wave going over the wall and makes the sea wall last longer. Gabions Gabions protect the sand dunes at old Hunstanton Gabions are cages filled with rocks . When a wave hits them, its power is distributed over the rockscausing less damage to the beach . Hydraulic action and attrition can effect the efficancy over time as they may be erodied the rocks could break free from the wire cage due to high levels of salt and water in the sea this could rust and weaken the steel wire. ...read more.

Conclusion

Coastal Processes The three main costal prosesses are transportation deposition and long shore drift . Erosion erosion can take place any where along the coast wheather it is beach sediment of cliff face . Corrasion Corrasiontakes place when waves carring beach sediment pound agains the cliff face the is a bit like sand blasting paint off metal. on a rough day with a high tide the waves can launch larger peices of rock at the cliff faces such as the fallen toe armour. Attrition Attrition happens when sediment smacks in to other sediment causing the sediment to decrease in size. Hydraulic action Hydraulic action is the brute force of the wave hitting the cliff face this can take out huge masses of the cliff face . Hunstanton's cliffs are mainly limestone as this is a fairly weak rock i would expect hydraulic action to be one of the main causes of erosion . Solution (corrosion) Solution is an silent and invisible deadly eroider ,it is when a week acid is in the sea and can break down a cliff. ...read more.

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