For a stretch of coastline you have studied, describe and explain the reasons for defending the coastline and evaluate the success of management strategies used.

        These two reasons are the main causes of cliff retreat at Overstrand and why this stretch of coastline needs defending. The cliffs at Overstrand are vulnerable to cliff foot processes, such as erosion by abrasion, attrition, hydraulic action and corrosion, caused by the destructive waves on the cliff. These processes act on the cliff foot causing a wave cut platform and eventually causing the collapse of the cliff.

        Overstrand also needs defending because of mass-movements such as rotational slump. Rotational slump occurs on weaker rocks, especially clay and have a rotational movement along a curved slip plane. The rates of erosion for Overstrand between 1966-1985 were about 0.4m a year, which shows the coastline, needed defending.

        These results were emphasised at Clifton Way, which was only built around 25 years ago. The need for a coastal protection scheme at Clifton Way followed a series of cliff failures; the first failure occurred in May 1990 when cracking of the cliff led to the collapse and recession of approximately 45 metres and in 1994 it endangered life and property.

        Overstrand is defended y the north Norfolk shoreline management plan. At Overstrand the hard engineering defences being very successful against cliff foot erosion. The main evidence for this strategy success is the wooden groyne being cost-effective as well as building up the beach to reduce erosion. Their strategy has also been to defend the main economic activity but to let the cliff retreat in the peripheral areas. However there strategy against mass-movements has not been successful as there are fewThese results were emphasised at Clifton Way, which was only built around 25 years ago. The need for a coastal protection scheme at Clifton Way followed a series of cliff failures, the first failure occurred in May 1990 when cracking of the cliff led to the collapse and recession of approximately 45 metres defences to stop this problem and mass-movements still occur during storms.