Beach dune erosion

Vegetation dunes known as sand dunes are made from inland dry beaches, surrounded by plants and other obstacles and are supported by most beaches. As sand accumulates, the sand dunes become bigger and bigger. Plants play an important role in this process, fighting the wind and capturing sediment. The characteristic of these plants is that as more sand is captured and the sand dunes grow, they grow through the sand and can constantly create new stems and roots. Stable sand dunes play an important role in protecting coastlines.

Storm surge, wave action, wind can cause erosion of beaches and sand dunes, which can have severe impact on seeds. Many wildlife species live in niches of coastal barrier island sand and dunes. In some cases, a storm will destroy the beach area. For example, the sea turtle's nest can be eliminated, or water waves known as "flushing" can soak these nests or bird's nests and carp nesting areas. As the hurricane 's strong wind continues, salty seawater gathers and spikes to the coast. These "storm surges" can be huge. The surge of Hurricane Irene has raised the water level 8 feet higher than usual, but Hurricane Katrina pushed a 30 - foot jump to the coast. In addition to the physical damage caused, the salt contained in the sea water also greatly changes the delicate balance of freshwater and saltwater wetlands.

The destructive power of storm surges and big waves can cause loss of life, building damage, erosion of sandy beaches and sand dunes, damage of coastal roads and bridges. Storm surge can move several miles on the inland. Saltwater intrusion risks public health and the environment in estuaries and bays. Tropical cyclones often produce a wide range of rain over 6 inches, which can lead to deadly and destructive floods. In fact, flooding is a major threat to tropical people. Rapid flooding (defined as a sudden increase in water level) can occur rapidly due to heavy rain. Long-term floods of rivers and streams may last several days after the storm. When approaching the water of the road, please change the direction and do not get drowned.