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Coastal Erosion There are a number of ways in which coasts are eroded:

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Introduction

Coastal Erosion There are a number of ways in which coasts are eroded: * Abrasion is the wearing away of shoreline by material carried by the waves * Hydraulic impact or quarrying is the force of water and air on rocks * Solution is the wearing away of base-rich rocks, especially limestone, by an acidic water. Organic acids aid the process * Attrition is the rounding and reduction of particles carried by waves In addition there are many forms of weathering * Salt weathering is the process by which sodium and magnesium compounds expand in joints and cracks thereby weakening rock structures. * Freeze-thaw is the process whereby water freezes, expands and degrades jointed rocks. * Water layer weathering refers to the tidal cycle of wetting and drying * Biological weathering is carried out by mollusks, sponges and urchins, and is very important in low energy coasts. Rapid erosion occurs on rocks with weakness, which might develop into sea caves. ...read more.

Middle

Beaches in mid and high latitudes are mostly pebble, whereas those in the tropics are mostly sand. This is due to the contribution of rivers as suppliers of sediment in the tropics. Beach form is affected by the size, shape and composition of materials, tidal range, and wave characteristics. As storm waves are more frequent in winter and swell waves more important in summer, many beaches differ in their winter and summer profile. The relationship between wave steepness and beach angle is two-way: steep destructive waves reduce beach angle, whereas gentle constructive waves increase it. Low gradients produce shallow water which, in turn, increases wave steepness. Hence, plunging waves are associated with gentle beaches, whereas surging waves are associated with steeper beaches. Sediment size affects beach profile through its percolation rate. Shingle and pebbles allow rapid infiltration and percolation hence the impact of swash and backwash will be reduced. As the backwash is reduced it will not impede the next swash. ...read more.

Conclusion

Stopping Erosion and Deposition Stopping erosion and deposition is not an easy thing to do as the force of nature is much stronger then any human force. This although does not stop man from trying as he might have come up with a few suggestions on how to decrease erosion which leads to a decrease in deposition. This may be done by hardening the type of rock being eroded; for example: the rock under erosion may be coated with concrete (which is a hard impermeable rock). This will result to the water slipping instead of eroding into the rock. It will also cause the deposition to decrease in a way since no more peaces of rock are present to be deposited, though fragments from the sea bed are still present. Another way to stop erosion is by causing less pressure on top of the cliff. This might be done by not building on top of it. The more pressure is done on top of the cliff the more chance of erosion there is at the bottom. ?? ?? ?? ?? Jeremy Spiteri ----- How To Combat Erosional and Depositional Coastal Features Page 1 of 3 ...read more.

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