Coastal Processes

EROSION

TRANSPORTATIO

N

DEPOSITION

transport

carry

Wave carry or transport

eroded materials along

its journey

The eroded materials are

called ……….

Sediments

DEFINITION

By now, You should already

know the four ways how

river transported its load.

Note that transportation

process in coastal areas

are the same as the

transportation process in

the river

•Larger particles like boulders and rocks

roll or slide along the river bed by the

strong river flow.

•Smaller particles like gravels and stones

are lifted and dropped along the river, so

they bounce along the river bed in a

hopping motion.

•Finer particles such as clay, fine sand

and silt are carried along the river without

contact with the river bed.

•Because the river water is moving, the

fine particles or loads are almost able to

float, and they are suspended in the

moving water.

•Dissolved materials containing minerals

like limestone rocks are slowly dissolved

by rainwater and are carried away by the

river.

•This type of transportation is difficult to

see with the naked eye but they are in the

water.

The journey

of a pebble

Pebble My life's a single pebbleThe tide takes from the beach, Lost among the breakersThe shore is out of reach.

I drift so far from others, My hope is out of hand,

I’m getting older, smaller-rolled to a distant land.

I started as a cliff,

And now I’ve turned to sand.

By Mr Pebble

What the pebble used to look like

Erosion

‘I broke off the cliff’

The waves were crashing under me ,

it was a stormy night.

I could feel everything vibrating,

then suddenly I started to break off,

I tried to hold on, but I was heavy,

I started to fall…….

I landed in….it was cold……

I kept spinning around….

other rocks kept bumping in to me…

Transportation

‘A Bumpy Ride’’

Scared and cold I was thrown around by the oceans force, I was rolling around the sea floor, other rocks bashing into me, the waves carried me away further from my home. ….. rolling, bounced, carried, dropped

Material carried along the shore• Group discussion (2-3 students in 1 group)

• Analyze the video (Youtube: Longshore drift )

• Discuss with your friends

• Make a short description of what you see on the video

• Send your finish work to blog spot under the comment section on

this sub-topic (Transportation)

• Time: 20 minutes

• All members have to post their work all at the same time (wait for

teacher instruction to do so)

You should include these words:

Swash, back wash, prevailing wind, angle, continue, wave, zig-zag

pattern

Long shore drift

Overall

process of

transportation

Continual swash

and backwash

transport

materials

sideways along

the coast

The movement of

materials is

called long shore

drift

Occur in Zigzag

pattern

References

http://www.tes.co.uk/ResourceDetail.aspx?st

oryCode=6122223