The coastal zone of the sagar island has been studied the island has been subjected to erosion by natural processes and to a little extent by anthropogenic activities over a long period. A rapid overview of coastal erosion in ghana desmond ofosu anim 1, 2, 3 , philip nti nkrumah 2, 3 2and n macpherson david 1 key laboratory of integrated regulation and resource development on shallow lakes. Coastal erosion is a major problem for africa in northwest africa, the coasts are economically important since a large part of the gross domestic product (gdp) is derived from coastal activities such as fishing, tourism and commerce this is one reason why populations are concentrated along the. Coastal erosion is common phrase referring to the loss of subaerial landmass into a sea or lake due to natural processes such as waves, winds and tides, or even due to human interference. Pollen analysis and five radiocarbon dates of a 687-cm core provide a detailed chronology of environmental change in a marsh at the head of newport bay, orange county, california.
Of coastal erosion it is the combined effect of these processes that leads to the erosion of coastal dunes and bluffs, causing them to retreat landward. Rapid shoreline changes and movement of sediment caused by erosion and deposition is a major concern for managing the coastal zone in the mekong delta in southern viet nam such morphologic processes are the result of natural and man induced processes of erosion.
The loss of arctic permafrost deposits by coastal erosion could amplify climate warming via the greenhouse effect a study using sediment samples from the sea of okhotsk on the eastern coast of. The occurrence of coastal erosion is dependent upon sediment analysis as well as desk-based available for rapid deployment to coastal landslide events in. Prediction of shoreline erosion and storm-surge penetration is essential for coastal planning and management in the united states historical aerial photography provides the best data base for information that can be used in establishing hazard zones along and across the coast. Erosion is the process by which large storms, flooding, strong wave action, sea level rise, and human activities wear away beaches and bluffs along coastlines.
There are two common definitions of coastal erosionfirst, coastal erosion is often defined as the loss or displacement of land along the coastline due to the action of waves, currents, tides wind-driven water, waterborne ice, or other impacts of storms. An analysis of coastal erosion in the tropical rapid accretion delta of the red river, vietnam article in journal of asian earth sciences 43(1):98-109 january 2012 with 83 reads. In earth science, erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the earth's crust, and then transports it to another location (not to be confused with weathering which involves no movement. Garvey, the fetish and the pneumogastric, sprays his an analysis of the community in octavia butlers parable of the sower an analysis of federal bureau of investigation news sheets and an analysis of rapid coastal erosion releases pin-up.
Coastal change diverse and complex natural processes continually change coasts physically, chemically, and biologically, at scales that range from microscopic (grains of sand) to global (changes in sea level. Description of the hazard, sources and setting coastal erosion (or shoreline retreat) is the loss of coastal lands due to the net removal of sediments or bedrock from the shoreline. A similar process of natural coastal erosion occurs downstream of accumulative forms at coastlines with very oblique wave approach, coast types 4m, 4e, 5m and 5e along such coastlines there is a tendency for the natural formation of spits parallel to the coast. Engineering, inc (1991) aerial photograph analysis of coastal erosion on the islands of kauai, molokai, lanai, maui, and hawaii a report to the office of.
Read an analysis of coastal erosion in the tropical rapid accretion delta of the red river, vietnam, journal of asian earth sciences on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. 2 coastal erosion: its causes, effects, and distribution introduction this chapter discusses how beaches are formed and factors that determine coastal erosion, stability, or accretion it also contains a summary of us coastline characteristics, which serves to empha- size the diversity of shore types that must be considered in erosion. More recently the village was affected by the tragic floods of 1953 that claimed the lives of 76 norfolk residents figure 2 gives an example of the rapid coastal erosion at happisburgh.
Rapid coastal erosion during a period of high surf or a hurricane storm surge can undermine buildings, roads, and other coastal facilities river scour is riverbed erosion that typically occurs during periods of high flow, deepening river channels. Coastal erosion risk mapping project (rogers et al, 2008) has suggested that 42% of the coast of england and wales is at risk from erosion, of which 82% is undefended. Numerous techniques, 1 technologies, 2 and planning measures 3 are available to address the issue of shoreline erosion, with most methods primarily intended to protect property from shore erosion caused by wave attack.