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Coastal erosion is the loss or displacement of land, or the long-term removal of sediment and rocks along the coastline due to the action of waves, currents, tides, wind-driven water, waterborne ice, or other impacts of storms.
Many coastal cities are making drastic changes to try to adapt. In San Diego, plans are underway in the beach town of Del Mar to move the train tracks that are now considered too close to the coast.
Coastal erosion is one of the most significant hazards associated with the coast. Not in terms of a rare massive release of energy or material resulting in loss of life, as is associated with tsunami and cyclones, but in terms of a continual chronic release that forms a threat to infrastructure, capital assets and property.
In addition, bulkheads and seawalls offer no filtering for surface runoff, this means that anthropogenic pollutants and chemicals in armored areas may enter coastal waters relatively quickly. [ 1 ] Hard engineering, also called shoreline armoring, comes with other ecological effects on top of habitat loss and increased surface runoff.
Diagram of accretion and erosion of sediments in a coastal system. Black arrows indicate accretion, and white arrows indicate erosion. Sedimentary budgets are a coastal management tool used to analyze and describe the different sediment inputs (sources) and outputs (sinks) on the coasts, which is used to predict morphological change in any particular coastline over time.
Coastal and oceanic landforms. Integrated coastal zone management minimizes the negative human impacts on coasts, enhances coastal defense, mitigates the risk associated with the sea level rise and other natural hazards. The beach erosion is a type of bioerosion which alters the coastal geography through beach morphodynamics.
Damage to the beaches can also negatively impact sea turtles that nest in the Caribbeans. The islands serve as nesting sites and habitats for sea turtles, which are all facing endangerment due to coastal erosion and changes in habitat at all stages of the life cycle. Sea level rise can impact where sea turtles nest and their nesting behavior. [25]
Coastal hazards are physical phenomena that expose a coastal area to the risk of property damage, loss of life, and environmental degradation.Rapid-onset hazards last a few minutes to several days and encompass significant cyclones accompanied by high-speed winds, waves, and surges or tsunamis created by submarine (undersea) earthquakes and landslides.