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Costal landforms
1. INTRODUCTION
A coastline is simply the meeting point of land and the
ocean It includes all the beaches, Cliffs, caves , etc That
line up at the end of the land
Sea levels rise and fall coastlines are reshaped
constant erosion or sediment builtup change the shape
and form of coastline
2. Coastlines changes with time when sea level rises and
fall coastline are reshaped Constant erosion or sediment
build-up also change the shape and form of coastlines
New features such as stacks and caves are formed and
older features also breakup
3. Coastlines are formed in many ways The deposit of
sediments carried by ocean,currents and river entering
the seas and also by erosion by waves .Rocky coastlines
are usually formed by erosion while Sandy beaches,
sedimentary and Shallow coastlines are usually those
formed from sedimentary deposits.earth or tectonic
movements can also pushup new landforms or spill out
new Lava from nearby mountains creating new coastal
features
4. Profile of coastal zone
A coastal zone is the interface between the land and
water these zones are important because a majority of
the world's population inhabit such zones coastal zones
are continuously changing because of the interaction
between the oceans and the land along the coast there
are two distinct zones observable in a day they are the
high tide line and the low tide line the average water
level between the high tide and low tide is called as
mean sea level
5. Coastal belt
Coastal belts are divided into three divisions Bakshore
region ,Foreshore region, Offshore region
Backshore region
The area of a shore that lies between the average high
tide mark and the average low tide mark
6. Foreshore region
The zone of the shore or beach above the high water
line
Offshore region
At a distance from the Shore
7. Waves Tides and currents
When we go to the coastal region we hear the
continuous sound of waves. waves are formed by
periodic changes in the water surface height caused by
the wind. waves are capable of doing both constructive
and destructive processes.waves get the energy from the
wind as the wind blows over the surface of the sea it
create friction this fictional drugs causes wave particle
to rotate and their energy is transferred in the form of
wave
8. The movement of particles
towards the coastal area is
called swash
when it is moving back it is
called backswash
Based on actions two main
types of waves have been
recognised
They are
constructive wave
Destructive wave
9. Constructive wave
They are low energy waves that tend to arrive at a rate
of less than 8 waves per minute. constructive wave are
small in height. They have strong swashand weak
backswash
10. Destructive waves
Destructive wave have higher energy and tend to arrive
at the coast at a rate of more than 8 per minute. They are
much larger in height then constructive waves often
have been caused by strong winds. Destructive waves
have a weak swash but a strong backswash
11. Process of coastal erosion
The combined effect of waves currents and Tides result
in the variety of gradiational processes acting in the
coastal zone coastal erosion happens in the form of
hydraulic action, corrosion, attrition, solution
12. Hydraulic action
Hydraulic action occurs when the
motion of water against a rock
surface produces mechanical
weathering
The abrasion of a river is
when the rocks,sand and
pebbles erode the river bed
Abrasion
13. Attrition
Attrition is the erosion of the river bed
solution
The solution of a river is the
final result of the erosion of
the rocks that are in the river
16. Depositional landforms
Depositional landforms are the visible evidence of
processes that have deposited sediments or rocks after
they were transported by flowing Ice or water, wind or
Gravity
17. Tides
Tides are the Rise and fall of sea levels caused by the
combined effect of gravitational forces exerted by the
moon and the sun and the rotation of the earth
19. Beaches
A beach is a landform alongside a body of water which
consists of loose particles the particles composing a
beach are typically made from Rock such as sand,
gravel ,shingle pebbles
20. Barrier spits and Islands
It is away from main beach area and it stands isolated in
Island
21. Tombolo
Tombolo is a kind of tide Island.It acts as a connecting
link between land and Island and it is called as Tombolo
