Aim:
The aim of this report is to identify the difference in sea walls at Collaroy beach and Cronulla beach and compare the structure of each sea wall too see what is most effective and productive. It will also analyse how both of the sea walls are affected by the particular wave patterns located at the beach and if these interfere with the structure of the walls. This also aims to explore how the beaches and surrounding areas were affected prior to the sea wall being constructed and the reason why the Sea wall was built in the first place.
Reason for and Impacts of the Sea Wall at Collaroy:
Prior to 2016, there was no sign of a man-made sea wall at Collaroy beach, the only form of sea wall was the naturally formed sea wall, these were the
…show more content…
The holes filled with sand allow grasses to grow to reduce the effects of wind erosion and trap wind-blown sands. The name comes from the construction as it is built on a sloped wall of ceramic or concrete blocks with hexagonal holes which make it look like a honey comb. Since the construction of this sea wall at Cronulla beach there has been no further issues as the sea wall has been an affective engineered construction. The holes in the honey comb sea wall are hexagonal holes and benefit the beach in another way as it allows for natural vegetation to grow by itself in an environment that is exposed to sunlight but also with protection form the wind and sand blown sediments. Along with advantages there are also disadvantages of a honeycomb sea wall. For example, the visual eyesore and aesthetics of a honey comb sea wall both visually and practically (for the people’s sake) are negative as the straight standing rock built sea wall is much more visually pleasing and as for the honey comb sea wall it takes up much more space than the rock armour crest as it is on a diagonal slope going down the beach which then reduces the amount of sand space for humans. Majority of beaches have sea walls and majority of those sea walls have the standard more traditional sea wall rather than the honeycomb sea wall …show more content…
The research was conducted to investigate the different types of sea walls at each beach, why they were different and to evaluate the most effective structure of a sea wall. First, I drove to Collaroy and examined, took photos of the certain sea wall and in this case the surrounding areas and parts of the beach that the sea wall did not continue onto. At Collaroy, only sections of the beach have a sea wall as protection and other parts are just sand dunes where the grass from the park meets the sand, as shown in the photos above. On another weekend, I went and visited Cronulla beach to examine the particular sea wall there. The reason I chose both of these beaches was due to the fact that the sea walls were so different. Collaroy was chosen due to the major destruction of the storm in recent years ago and to why the wall was built as a result of this. Cronulla on the other hand was chosen due to the honey comb sea wall construction at this beach. This is a fairly new type of structure and is not found at many beaches, this type of structure is referred to as the ‘new and improved’ sea wall as it has proven to be a lot more successful than a regular sea wall, therefore it would be a good comparison to test for myself on which wall was most
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.
town was just a small hamlet the only protection from the sea was by a
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
In Roman times St. Mary's Church was built with Twin Towers as part of the building. Originally the church was 3kms away from the sea but as the cliff was eroded it eventually became next to the see. There was a danger the cliff under the Twin Towers and therefore the Twin Towers themselves would be destroyed by erosion. To stop this happening many coastal defences and different types of management have been erected. The initial try at coastal management was in 1809.
There are many different types of coasts that exist throughout the United States. The south shore of Long Island has a unique types of coast known as a barrier beach. Barrier beaches are long narrow land forms that are composed of sand and other lose sediments. These sediments are brought together by the actions of waves, currents and storm surges. Barrier beaches are subject to constant changes by the same forces. Sand is constantly eroded in one area an deposited in another. Barrier coasts are important for a number of reasons; they protect the mainland of Long Island from the open ocean and flooding during storms, for recreational use and the unique ecosystems which exist on barrier beaches.
is being eroded by the sea so that cliffs, up to 20 metres high rise
As can be seen, there is a large fetch distance between Hastings and the French coastline much further south of this map. For over a hundred years, there have been rapid coastal problems at Hastings. However within the last 30 years, there have been drastic measures taken at Hastings to improve the coast and protect the town by implementing strategic coastal management plans where some have been successful and others not so successful. The main idea behind the coastal engineering was to protect the cliff face at certain areas along the coast, and the beach and pier at Hastings.
... consider some ideas of what can be done to further enhance the management of the coastal issue. Using the research action plan, I aim to acquire a sophisticated understanding of longshore drift, coastal management and implementations of coastal issues, through the research action plan. Most importantly, I will include various diagrams explaining how the process of longshore drift occurs and what implementations it has on coastal environments, accompanied by an explanation of how the issue is being managed, a detailed outline of the geographical processes involved and a discussion of the impacts of the issue and why it is important.
The hypothesis presented in a paper titled, “Barrier Island Formation”(Hoyt 1130), is as follows: Along a sand shoreline, wind will form dunes or ridges (depending on the type of material the beach is composed of). If there is a relative submergence, the area landward of the dune/ridge will be flooded to form a lagoon and the ridge/dune then becomes a barrier island. This would most likely occur when a stable shoreline with a well-developed ridge is engulfed by a relatively sudden transgression that does not erode or push the ridge landward (Ot...
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.
“A topic that I am personally fascinated with is polygamy. I watched a television series years ago called “Big Love” and became intrigued. The series displayed all aspects of polygamy, which included the struggles of having multiple wives. I found an article posted July 2015 on the New York Times website by W. Bradford Wilcox, and I completely agree with him. I think Wilcox provides great examples and points to why polygamy causes more damage than spreading more love.
Shoreline Stabilization North Carolina’s barrier islands, a 325 mile-long string of narrow sand islands that forms the coast of North Carolina, are one of the most beloved places to visit and live in the United States. With the winds and tides, we change yearly. Look back on a map from twenty years ago and you can see how the Outer Banks has changed. The lines have shifted, new inlets have opened and closed, and overall the famous barrier islands are getting narrower.
Many people have taken material from the wall causing it to crumble in some section. They also dug into the wall to make sheep folds. During the Cultural Revolution some of the wall was deliberately destroyed. In the 1980’s the Chinese government heavily renovated the wall at the most visited sections. Although the wall no longer serves the purpose of defense, it does quite the opposite as a tourist attraction so that China can make money.