Coastal erosion is the process of the removal of sediment within a specific beach segment over a fixed period of time. Ongoing for thousands of years, coastal erosion impacts several beaches within Sydney, and the issue is rapidly expanding along the coastline away from larger urban areas. The degree of coastal erosion can be measured through the volume of beach sediment, such as sand and gravel, lost during a particular event, or the movement of significant beach features towards land. The causes of coastal erosion are due to both natural and human activity and can be divided up into exogenic processes, natural disasters and human occupancy.
EXOGENIC PROCESSES:
Exogenic processes are external processes, such as wind and rain, occurring on or above the Earth's surface. Where land is less covered and more exposed to exogenic processes, erosion will be very evident. Beach sediment blown away by wind is known as sand drift, while storm water erosion refers to processes of rain removing beach deposits. These processes will slowly transport the sand off the coast into different areas, mainly large water bodies such as rivers, lakes and oceans,
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Thus, they have met the first criteria as they have made a strong stand against the council’s plans of potentially extending the sea wall. As they have used the media to position themselves in the Sydney Morning Herald, they have fulfilled the 2nd criteria as they have effectively spread awareness of the risk of responding to coastal erosion through sea wall construction on a local and national scale through the newspaper. However, focused primarily on the protest against the sea wall, no alternate solutions were proposed to solve the coastal erosion, thus, failing the 3rd criteria. Overall, the group of Narrabeen and Collaroy residents are not successful in addressing the issue of coastal
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)
Investigating the Geographical Processes that are Affecting the Physical and Built Coastal Environment There are three geographical processes that are affecting the physical and built coastal environment, they are; erosion, deposition, and transportation. Erosion is the group of natural processes, including weathering, dissolution, abrasion, corrosion, and transportation, by which material is worn away from the earth’s surface, this is mainly caused by wind, running water, and waves breaking on the coast. Deposition is the depositing something or the laying down of matter by a natural process. Transportation is when sand is moved along the coast by long shore drift. At North Cronulla beach erosion is evident.
Semaphore is a classic Adelaide beach supporting many facilities. However, this would not be the case if coastal management was not put into progress. Coastal management is a way of supporting the world’s coasts, by using many techniques from construction of structures in which prevents wave energy from reaching the shore to planned strategies. Factors of this includes; rising sea levels, erosion, long and short term drift, sand movement and marine biology. The importance of coastal management is quite significant as it will help to prevent coastal erosion. In addition to this, without coastal management the world will be affect economically, environmentally as well as socially. Without the strategies involving the management of the coast,
North Sea to the east. Part of the Naze is made up of a hill, which
Case Study of Hastings Coastal Management Hastings is a town on the south coast of England approximately 60 miles south of London (see map below). In recent years, the coastline at Hastings has had to face many large scale problems, including the 10 km stretch from Hastings eastwards to the small town of Fairlight. With the coastline at constant exposure to the English Channel, there are many coastal processes which take place along the stretch of beach and cliff. [IMAGE][IMAGE] [IMAGE][IMAGE] Longshore Drift [IMAGE] Fetch [IMAGE]The map on the left illustrates the location of Hastings and also the area of the coastline which is being discussed in this case study.
Longshore drift is a process by which sediments are transported from one place to another. When this process occurs, beaches, spits and sandbars are accreted over time. If the process of longshore drift is altered by factors such as stronger winds and stronger currents, beach erosion begins at a faster rate and this may result in many serious problems. The main stakeholders of longshore drift are resort owners. They rely on people to visit their resorts and enjoy the beach. However, if longshore drift erodes t...
The Progressive Era was a period in which the federal government increased its legislation and its grasp of the nation. There were three distinct pieces of federal legislation that seem to stick out, The Meat Inspection Act The Federal Reserve Act,, and The Hepburn Act. All of this legislation gave the government an extremely large amount of power to regulate business and industry as well as the people of the United States of America.
hard rock is eroded, it can cause an island of hard rock left of the
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.
Louisiana contains approximately 40% of the coastal wetlands of the lower forty-eight states. Louisiana has lost up to forty square miles of marsh per year for several decades (accounting for 80% of the nation’s annual coastal wetland loss) (lacoast.gov). From a hydrologic standpoint, the wetlands replenish aquifers, hold excess floodwaters from intense rainfalls, and provide storm surge protection.
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.
This paper introduces the environmental concerns of the loss of coastal wetlands. The paper will discuss the significance of wetlands and the devastation that is occurring because of human activity. Wetlands are an essential element of our environment both ecological and societal; conservation will be essential for the preservation of these precious ecosystems.
and the effect it will have on the coast before they are allowed to be
Coastal Erosion is a process at Muriwai that gradually wears away the rock particles of the earth's surface, transporting them to another location. There are many types of processes that cause erosion at Muriwai such as wave erosion, wind erosion and wave refraction.
Planting trees and certain other herbaceous plants can have a significantly positive impact on the mitigation of soil erosion. Some great plants that are useful when trying to control soil erosion are sage, buckwheat, and oak trees. This will help keep the water from soiling up and another way is that wrappers, bottles and other trash are unfortunately a common sight at many well-used beaches and rivers around the world. It should be obvious that the trash from these places often ends up in waterways and can cause pollution. Plastics are an especially big issue when it comes to water contamination at beaches and waterways.