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What is the definition of backshore in geography?
Definition of Backshore: The part of the beach lying between the beach face and coastline. The backshore is dry under normal conditions; it is often characterised by berms. Vegetation is generally sparse or absent. The backshore is only exposed to waves under extreme events with high tide and storm surge..
What is the difference between foreshore and backshore?
The nearshore is always underwater, while the foreshore is that part of the beach extending from the mean low water line to the highest elevation reached by waves at normal high tide. The backshore encompasses the area landward from the water’s reach at normal high tide to the maximum uprush during storms.
What are the essential features of the backshore?
The key features of Backshore include well-sorted and well-rounded sediments; coarse and medium sand; parallel bedding and low-angle cross-bedding in sedimentary structure.
What is a foreshore in geography?
Beside the sea, a lake, or a wide river, the foreshore is the part of the shore which is between the highest and lowest points reached by the water.
How is Backshore formed?
The backshore typically features the material deposited by storm waves. The gradient of the beach tends to change during the year. It cannot advance further up the beach because it is destroyed by the backwash from the previous breaking wave. Ridges and runnels form parallel to the shoreline in the foreshore zone.
What are Subaerial processes?
Sub-aerial processes refer to the processes of weathering and mass movement. Weathering is the breaking down of rock in situ. It can be divided into mechanical and chemical weathering. Mechanical weathering refers to physical processes like freeze-thaw action and biological weathering.
What is a Subaerial process?
What is the difference between hydraulic action and corrosion?
Often this causes cliff material to break away. This process is known as hydraulic action. Attrition is when waves cause rocks and pebbles to bump into each other and break up. Corrosion/solution is when certain types of cliff erode as a result of weak acids in the sea.
Where is the foreshore of a beach?
The foreshore can be said to be the part of the shore/beach, which is wet due to the varying tide and wave run-up under normal conditions, i.e., excluding the impact of extreme storm waves and storm surge.
What is a beach system?
Beach systems are an essential component of a larger scale coastal landform called barriers, which are long-term accumulation of wave, tide, and wind deposited marine sediment (usually sand) at the shore. Some are backed by large dune systems as along the Oregon coast.
What does a berm mark on a sandy beach?
A beach berm is a nearly horizontal shore parallel ridge formed on the beach due to the landward transport of the coarsest fraction of the beach material by the wave uprush.