Sea Level Change and Coastal Processes

The primary cause of global sea level rise in recent decades is the melting of glaciers and ice sheets, particularly in Greenland and Antarctica, due to rising global temperatures.

Barrier islands are formed by the process of longshore drift, where sediment is transported along the coast by waves and currents, and deposited in shallow waters, creating elongated, narrow islands parallel to the shoreline.

Coastal erosion is the process by which coastal landforms, such as beaches, cliffs, and dunes, are gradually worn away by wave action, tidal currents, and other erosive forces.

Sea level rise is generally associated with negative consequences such as flooding, erosion, and habitat loss. Increased tourism and economic development are not direct consequences of sea level rise.

Beach nourishment is the process of adding sand to a beach to combat erosion and restore its natural profile. It involves transporting sand from offshore or other sources and placing it on the eroding beach.

Encouraging coastal development is not a viable adaptation strategy to address sea level rise, as it increases the vulnerability of coastal communities to flooding and other hazards.

Longshore drift is the process by which waves break at an angle to the shoreline, causing sediment to be transported along the coast in the direction of the wave's approach.

Salt marshes are formed through the process of tidal inundation, where regular flooding by tides deposits sediment and promotes the growth of salt-tolerant vegetation, such as cordgrass.

Offshore sediment transport is the process by which sediment is transported away from a beach by waves and currents, typically to deeper waters.

Coral reefs are not considered coastal wetlands, as they are formed by the accumulation of calcium carbonate produced by coral polyps and are typically found in tropical and subtropical waters.

Wave breaking is the process by which waves break and dissipate their energy before reaching the shoreline, typically due to interactions with the seabed or changes in water depth.

Enhanced coastal tourism and recreation is not a potential impact of coastal erosion, as erosion typically leads to the loss of beaches and other coastal amenities.

Wave refraction is the process by which waves change direction as they approach the shoreline due to variations in water depth, causing them to bend towards shallower water.

Enhanced coastal productivity and fisheries are not potential consequences of sea level rise for coastal ecosystems, as rising sea levels typically lead to habitat loss and disruption of marine ecosystems.