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Human activity on affecting coastal landscapes
Coastal management strategies
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The Holderness coast is located on the east coast of England and is part of the East Riding of Yorkshire; a lowland agricultural region of England that lies between the chalk hills of the Wolds and the North Sea. It stretches from Flamborough Head in the north to Spurn Head in the South. It is one of Europe’s fastest eroding coastlines. The average annual rate of erosion is around 2 metres per year but in some parts of the coast, it is up to 10 metres per year. These high rates are attributed to both human and geographical causes. The physical causes are more damaging because the coast is made up of soft boulder clay which experiences more rapid rates of erosion. The erosion of the cliffs and seabed result in huge amounts of sediment being …show more content…
Coastline management is just one of the solutions put in place to repair human pressures put on coastal environments. Coastal defenses help to prevent coastal erosion and flooding by the sea. Management strategies can be both short term and long term, and both sustainable and unsustainable. The two types of cliff defenses are cliff base and cliff face. There are also two types of management, hard engineering and soft engineering. There were an array of coastal management strategies put into place to help the situation that encompassed Holderness coast. There are many conflicts that arise from the matter of coastal management. Most locals are opposed to coastal management because of the high coast and the fact that it is very time consuming as well as invasive, so there was a delay in starting management for Holderness, given that it is very tourism-centered. The towns of Mappleton, Hornsea, and Withernsea that are along Holderness coast are examples of attempts at management strategies. The statement that management strategies for coastlines are generally ineffective is somewhat true for the short term and mostly true for the long term in regard to Holderness …show more content…
In more recent times human management has interfered with the sediment balance and natural flows. The strategies that were put into place in the towns of Mappleton, Hornsea, and Withernsea included both hard and soft engineering. Hard engineering is when a structure is used to protect the coastline and soft engineering is working with natural processes to protect the coastline. The hard engineering strategies that were employed in all three towns include sea walls, groynes and revetments. Seawalls are large scale walls designed to deflect wave energy. With the construction of a sea wall in Hornsea, the wall trapped sediment which led to guarantee of steep beaches. Another hard engineering strategy was the construction of groynes. Groynes slow down longshore drift and build up on the beach. Two rock groynes were built in Mappleton in 1991 which helped develop wide and steep sandy beaches. A revetment, which is a natural-looking way to protect the base of cliffs, was also built in Mappleton which helped halt erosion. Similar defenses were built at Withernsea, and rocks were also placed along a sea wall to guarantee further protection. This statement is still somewhat true even in regard to the short term effects because of how the defences have ‘backfired’ in a way and created new issues. These issues have created more of an issue for long term
Investigation on Coastal Erosion In Porlock Bay Aims ---- Aim 1: To find out if beach material is moved across Porlock Bay by longshore drift. Aim 2: To find out which type of sea defense is best for Porlock bay. If L.S.D. (long shore drift) were taking place I would expect to find: a) Deposition at one end of the bay and against any abstractions such as groynes. b)
There are many things working together to ensure Dune stabilization. These include; re-vegetation, fences, poly-mesh fencing, planked walkways, and controlled pedestrian access. This method is a softer option than the rip-rap wall and is used because human land-use, which at this place consists mainly of recreational buildings, is far away from the ocean. Deposition is also being managed at North Cronulla beach. Dune stabilization is being used to prevent deposited material from being eroded away.
The Precambrian Shield Rocks found in the Brickworks was formed in an ancient sea more than 1.4 billion years ago. Over many years, the heat and pressure from plate tectonics slowly pushed the land into a mountain chain. During the Ordovician period (around 470- 448 million years ago), the mountain chains This layer of shale and limestone is called the Georgian Bay
Semaphore Beach is affected by many factors such as natural processes and human impacts including marine litter and the discharge of stormwater. Therefore, several plans have been employed to ensure that the coast is supported through the method of counteracting erosion. However in the future, many management strategies have been put into consideration as well as the environmental, economic and social impacts as well as the predicted consequences. These impacts include traffic related incidents, noises and air pollution and the disruption of wildlife and the erosion of dunes. A method that should be considered for future management of the beach is the use of a concave sea wall, although efficient, this structure would be quite costly. Without the use of coastal management, Semaphore Beach would be unsupported, therefore negatively being affected by a variety of
The sea wall protected the low-lying farmland and in addition to this the railway that links Ramsgate and London. A smaller recurved concrete sea wall was built west of the Towers to avert flooding at Reculver. Additional wooden groynes were sited on the beaches to delay longshore drift and maintain the shingle beaches, which itself is a defence. In the 1960s the houses at Bishopstone Glen were in danger of being destroyed because the soft clay and sandstone cliffs underneath them were so unstable. As a result another sea wall was built, this time underne... ...
We saw that there was vegetation, which had been planted on the sand dunes near Dunwich Heath. There is also fencing around the dunes to stop them being eroded through people walking on them. Coastal Protection At Aldeburgh Text Box: Fig 4.1Text Box: In Aldeburgh however, the types of protection involve 'hard' protection. These are man-made objects. At Aldeburgh, three hard protection methods have been employed, and one soft method.
Barrier Beaches stretch along the entire east coast of the United States. The barrier beaches from Long Island to Maine are known as Glaciated Coasts because their formation was assisted by glaciers. Eighteen thousands years ago a glacier covered most of the eastern US. This glacier terminated at present day Long Island. About fifteen thousands years ago the glacier began to retreat. As it melted it left behind mounds of rubble, called moraines. This particular glacier left behind two moraines because its final recession was a two part process. These two moraines are the Ronkonkoma Moraine and the Harbor Hill Moraine. The Ronkonkoma Moraine is located in central Long Island and the Harbor Hill Moraine is located on the northern part of Long Island. Besides the two moraines the glaciers deposited great amounts of debris offshore. This debris supplies the sand needed to create and maintain a barrier beach system (Hoel 16-18).
This rock type could prove dangerous, being soft and with little solidness in its structure. Therefore placing the protection over the rock cliffs was a very well thought and planned engineering
Longshore drift influences the deposition and erosion of sediments. Waves erode the coast and transport the eroded material along the coastline. Over a period of time, the material will be deposited on a beach or form a larger feature such as a spit. Groynes are structures built at equal intervals along the coastline. Their purpose is to restrict longshore drift, preventing coastal erosion.
Coastal erosion is a growing problem along the Gulf Coast. Louisiana is one of the coastal states most affected by coastal erosion. Ninety percent of wetland loss in the nation occurs in Louisiana, losing 25-35 square miles per year. At that rate, Louisiana will lose 640,000 more acres by 2050. Many factors contribute to this land loss, such as rising sea levels, subsidence, hurricane storm surge, cold fronts, and human interference. Cold fronts and hurricanes can both have detrimental consequences on the coast of Louisiana (Zhang 2004) (Restore or Retreat 2012). This research shows whether cold fronts or hurricanes have a larger effect on coastal erosion. The researcher will describe how historical and current satellite imagery help in determining the changes in the Louisiana coast. Based on previous research, the researcher believes that hurricanes have more of an effect on coastal erosion than cold fronts due to the high winds and storm surge.
The question that I will be answering for my coursework is which is best at protecting the Northumberland coastline – groynes or beach nourishment. I will be going to Blyth beach also I will be visiting Newbiggen beach I am investigating the Northumberland coastline as part of my geography coursework also because I live in the UK and I want to see how safe the people of the UK are with the safety of the coastline and its defences against coastal erosion. We will be visiting the Northumberland coastline on Thursday the 15th of May 2014.
Surfers, swimmers and sunbathers use beaches for recreation. People fish off beaches for food. Since many people take their vacations at the beach, lots of beaches in tropical locations are important to their country’s economy. Entire cities, regions and countries depend on the money tourists spend while visiting the beach. Beaches are naturally very dynamic places, but people try to control them and build permanent structures, such as houses, restaurants, shops and hotels, on or near the shore. The natural erosion and deposition of beaches becomes a problem. Beaches con disappear over time, or even over night during severe storms. Beaches are areas of loose sediment (sand, gravel, cobbles) controlled by ocean processes. Most beaches have several characteristic features. First are offshore bars, which help protect beaches from erosion. Next is the foreshore, which rises from the water toward the crest of the next feature; a berm. On low-lying shores, dunes form behind beaches. Dunes look like rolling hills of sand and are blown into place by the wind. New, smaller dunes are often changing shape as the wind continues to affect them. Waves and currents move the accumulated sediment constantly creating, eroding and changing the coastlines.
Coastal Erosion operates at different rates and different times. Limestone rock is eroded slower than sedimentary rock. The cliff at Muriwai made of sedimentary rock was eroded back to expose 'Fisherman's Rock' - the shore platform which, made of limestone -- tended to erode back slower than the cliff.
Security is risked: Protectionists off and on again battle a country that ought not to be reliant to the point that it can't shield itself.
...f of the CZMU. Although the CZMU’s mandate is to address coastal management with an integrated approach, it is worth questioning whether all interests are accounted for equitably? Barbados’ urban planning strategies employ the top-down approach and the department is reputed for pursuing economically profitable projects. To have both the CZMU and the Town and Country Planning department engaging in public participation consultation would be favourable to pursuing environmental policy in tandem with socio-economic equity.