Can you explain for me please why the sea erodes at different rates along the coast?

Question

Also, could you explain how the sea transports and desposits material?

Thank you so very much.

Answer 1

It erodes at diff rates because some stretches of coast consist of softer material than others - hence it erodes more quickly

Answer 2

Obviously sandy coastlines will erode faster than a rocky shore.  Many southeastern states vigorously plant erosion control plants to help minimize the impact of regular tidal activity, however a hurricane can quickly erase all those efforts.

Regarding the 2nd question, there are fast moving currents in the oceans.  As these currents flow, they are continually picking up loose material and where there are places the current "eddies" they will deposit these loose deposits.  Over time, that can build out a shoreline with enough time and material.

Answer 3

There are a number of factors to take into account.

Total wave energy - this is determined by the direction the coast faces compares with the direction of maximum "Fetch" - ie the maximum distance the wind can blow across the ocean and thus give energy to the waves. On a larger scale the relationship to weather patterns - broadly speaking, the more stormy the weather on average, the more energy the waves will have. Most removal of beaches occurs in storm events ( though the storm waves may have travelled quite some way) as generally only storm waves have sufficient energy to remove the larger particles of sediment.

The local geology will also have a significant effect - not only will hard, resistant rocks resist weathering better than softer rocks but the amount of sediment, particularly boulder to sand   grade sediment is significant. Thne reason for this is beaches, the best protection for a coast is nice, gently shelving beaches that slowly soak up the energy of aproaching waves, reducing the mechanical impact at a cliff foot, and reducing the energy to remove material offshore.

Preventing beaches moving by means of longshore drift, by building lots of groynes to prevent lateral movement is a pretty ubiquitous artificial coastal protection strategy.

Another more subtle factor is the detail of local geology - alternations of hard and soft rocks along the coast can result in bays, in the softer material, and headlands in the harder materials which then protect the further erosion of the bays by maintaining the beaches within the bays just like natural groynes.

Hoe does the sea transport material - mostly by suspension ( and just a little by solution) The more energetic the motion of the water, the larger the particles it can support in the water column and carry off, as the velocity of the water decreaces, first the larger, then eventually the smaller particles will settle out.

Answer 4

It depends upon topography of that place.

Answer 5

It depends on sea currents (speed,direction,wave,etc) and topography of the sea bed.