Introduction: The coastlines of Darwin have been exposed and greatly affected by natural forces such as erosion, waves (constructive and deconstructive), and deposition. Human influences have also played a role in shaping the Darwin coast, people have been planting/ destroying plant life, building sea walls and placing dams on rivers. All these forces demonstrate that landscapes are influenced by both natural and human forces. Body:. Darwin’s coastlines have been changed by many forces and have shown many different coastal landforms. Both human and natural forces have played a part in the changing Darwin’s coast. One of the most prominent natural forces at play is erosion. Erosion is a process where landforms are torn down by natural forces …show more content…
Hydraulic action is when waves force air into cracks in a rock face. Attrition is when waves cause rocks to smash against one another, breaking them down into smaller and smaller pieces. Then finally, corrosion, corrosion describes a process where salts and acids from the sea dissolve rock gradually (Geological survey 2016). The other main force of this coastline is deposition. Deposition is a process, where sand, rock fragments, and stones are carried along inside waves, when those waves lose their strength the items that have been carried along inside them are deposited on beaches and other coastal areas (BBC 2021). Waves are the last main natural influence on the Darwin coastline. There are two different kinds of waves: constructive and destructive. Constructive waves are low intensity waves that bring materials and debris to coastlines. These low-energy constructive waves have stronger swashes than backwashes. Accordingly, any debris brought by the sea is washed up and accumulated along the coastline. The development of beaches is the most common way to observe the material that constructive waves deposit (Geological survey 2016). The second main type of wave …show more content…
People manage coastlines for many reasons. These reasons range from conserving the natural landforms of the coast, to protecting the coastal cliffs for development opportunities. One of the more environmentally friendly ways that people manage the coastlines is by removing and planting coastal trees such as mangroves. Mangroves minimize erosion effects. This minimising effect is important in Darwin’s wet season, during major weather events like cyclones and heavy storms, mangroves provide ecological support in areas that they populate. Mangroves extensive roots keep soft materials like clay together, while their above-ground roots reduce water flow, which lessens coastal erosion (The Nature Conservancy 2020). People plant mangroves as an alternative to less natural and more man-made ways of preserving the coast. One of these alternatives is seawalls. Seawalls are structures that are placed on the coast to slow shoreline erosion. Seawalls are meant to hold the soil in place and to prevent it from sliding, while also offering protection from wave action. They serve as coastal flood defences in addition to their primary purpose of reducing erosion. Seawalls can be built in several materials and can take either a vertical or sloping shape, shape varies depending on the type of coast that they are constructed on. They could also be known as revetments. ccnc 2016 - ccnc 2016 -
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,
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.
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.
The location of the study area is Silver Beach in Kurnell Peninsula, near Cronulla. It is located in the Sutherland Shire, south of Sydney Central Business District (CBD) and just directly south of Kingsford Smith International Airport. The area also has a historical significance as it is near the landing place of Captain James Cook on the 28th of April 1770 in Botany Bay.
The impact of the waves of the Pacific Ocean against the land was eating away at the bluf, breaking it down into gravel. In 2001, the two proprietors decided to do something to protect their property. On December eleventh, Pismo Beach authorized a Coastal Development Permit that allowed them to begin construction of a seawall to act as a buffer against the erosive impacts of water that crash upon the side of the cliff (W12b). The seawall stands fifteen to twenty feet above the water and is one hundred sixty-five feet in length with a width of one and a half feet (W12b). Looking at this wall, I thought it was a shelf of sedimentary rock, of which the face of the cliff was naturally composed.
"Geography Site: Coasts - Longshore Drift." Geography Site: Coasts - Longshore Drift. N.p., 11 Jan. 2008. Web. .
Coastal Erosion and Defence in White Cliffs Country Introduction The shoreline is a dynamic system where stability is maintained despite the continued movement of waves, tides, wind and sediment. The present configuration of the shoreline is now controlled by the various coastal defences', which mankind has put in place over the last 100 - 200 years. These have stopped or slowed the transport of sediments and reduced the ability of the shoreline to respond to Natural forcing factors. Who is responsible for the coastline?
Today, with our understanding of how fragile the coastal areas are, there are many study and restoration projects underway. Since the implementation of the Coastal Wetlands Planning, Protection, and Restoration Act (CWPPRA) in 1990, there have been 151 coastal restorat...
The negative consequences of erosion were virtually non-existent because there was no infrastructure on the shore of the beach. As shown in the image, the sand was expansive and naturally progressed into
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.
The Earth’s biosphere is being affected by climate change in numerous ways. The interactions that occur between the hydrosphere and atmosphere are leading to changes in our ocean’s chemistry that could be devastating to humans in the future generations to come. Climate change is the modification in the climate patterns. The effects of climate change have become particularly apparent from the mid to late 20th century onwards and have been substantially contributed to by the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels.
Analysis of sites in five coastal states indicate that many marshes and mangrove ecosystems receive adequate mineral sediments to produce enough organic sediment and root material to remain above sea level at the present rate of sea-level rise (1-2 mm per year globally). However, three of the twelve wetlands studied were not keeping pace with the current rate of sea-level rise. If sea-level rise accelerates, some additional sites would also begin to slowly deteriorate and submerge.
Natural Processes are actions or events that have natural causes, which result in natural events. The three main coastal environment processes that operate at Muriwai are Coastal Erosion, Coastal Transportation and Coastal Deposition.