EQ2 Flashcards
what does sediment move along in
sediment cells
how many major sediment cells are in england and wales
11
TRUE or FALSE can major sediment cells be divided further
TRUE
Each major cell can be divided into a number of sub cells
what are each sediment cell operating within
Each cell operates between physical barriers that prevent sediment from moving any further along the coast
what is interlinked within sub cells
erosional processes
transport processes
deposition
can some coastal features operate as sinks, source and transfer zones
NO
ONLY some coastal features operate as SINKS AND SOURCES
- depends on whether the dominant processes are erosion or deposition at a given time
what is a source
give examples
a place where sediment is generated
such as cliffs, sand dunes or offshore bars and even river systems
what is a transfer zone
places where sediment is moving along the shore
via longshore drift and offshore current
what is a sink
locations where the dominant process is deposition
-depositional landforms are created such as spits and offshore bars
define sediment budget
The amount of sediment available within a sediment cell
what state does a system act in under natural conditions
DYNAMIC EQUILIBRIUM
TRUE or FALSE can dynamic equilibrium be disrupted
TRUE
dynamic equilibrium can be disrupted by storms leading to increased erosion
what do negative feedback mechanisms do to the dynamic equilibrium
Negative feedback mechanisms help maintain the balance by pushing the system back towards equilibrium.
what do positive feedback mechanisms do to dynamic equilibrium
Positive feedback mechanism is where one change has led to another change which leads to disequilibrium in the coastal system.
does positive feedback lead to equilibrium or disequilibrium
DISEQUILIBRIUM
does negative feedback lead to equilibrium or disequilibrium
EQUILIBRIUM
what are 2 factors that impact the state of dynamic equilibrium
Coastal management
Global warming
how does coastal management impact the state of dynamic equilibrium
can decrease erosion leading to less sediment input
how does global warming impact the state of dynamic equilibrium
Increased storms due to global warming could lead to long term erosion of sand dunes with no chance to recover between storm events.
Rising sea level could increase erosion of spits and estuaries, removing sediment faster than it can be replaced.
what do waves directly influence which in return shapes the….?
erosion, transportation and deposition,
so they shape the coastline.
how are waves caused
by friction between wind and water
what is wave size dependant on
-The strength of the wind
-The duration the wind blows for
-Wave fetch - the uninterrupted distance across water over which the wind blows
-Water depth - see waves as they approach a shoreline
how are waves affected when approaching the shoreline
the water shallows and the shape of the waves changes significantly.
what happens when the internal orbital motion of water touches the sea bed
friction occurs and this slows down the wave