This document discusses three coastal landforms produced by deposition: beaches, spits, and bars. It describes beaches as landforms formed by wave deposition of material along the shore. Spits are described as depositional landforms that form when longshore drift carries sediment along a coastline until the coastline changes direction, causing sediment to build up into a ridge. Bars are described as forming when a spit develops across the mouth of an estuary, building sediment deposits across the two sides and creating a barrier landform across the estuary. Examples and diagrams are provided to illustrate each landform.

1. What coastal landforms are
produced by deposition?

2. Brain teaser … what does this
show?
Video
here

3. Longshore Drift (LSD)
Watch this and then draw a diagram in your
notes. p. 149 in your text book.

5. Depositional Landforms (p24-25)
• Video here (to 3.21)
• Three main features:
– Beaches
– Spits
– Bars
Depositional Landforms

6. 1. Beaches
Depositional Landforms

7. What does this show?
Depositional Landforms

8. Annotate your photo
to explain why a
beach is formed
here as we discuss
Depositional Landforms
1. Beaches – wave refraction

9. Beaches – Berms
These show high tide marks
Depositional Landforms
Annotate your
photo to explain
what a berm is

10. 1. Beaches (p24)
• Complete the following sentences.
• Material is carried along the beach by
the process of ………
• The waves that form beaches are ……
• Sandy beaches are found in …
• Pebble beaches are found along …
• In a bay the waves …
• A ‘berm’ is a …….

11. 2. Spits

12. What will happen to the material on
the beach being moved by LSD?
Direction
of LSD
Direction of
prevailing wind and
waves

16. What happens to this spit when
the wind changes direction?
Change in wind
direction

17. • Video here Spits (from 2.00)

23. 2. Spits
• Spits form when ______ _______ ______
carries sediment along a coastline. When the
coastline _____ direction , the sea deposits the
material it has been carrying because it meets a
river ____ . The change in water _____ means
that sediment is _______ and a long ridge starts
to form, a ____. At the end of the spit, seasonal
changes in wind direction can create ______
ends. The sheltered area behind a spit is where a
____ marsh develops.
• Use your own words! (p. 25 will help you)
Depositional Landforms

24. DAWLISH WARREN, DEVON
Annotate your map!
Fetch - direction of prevailing winds
(and therefore waves) in approaching
the beach.
Direction of
Long-Shore
Drift.
Short term changes in wind and
wave direction causing the curved
ends to the spit.
Original
Coastline
Salt
Marsh
Fastest current
at the centre of
the river.
River
Estuary

26. How do you think this feature formed?
Depositional Landforms

27. 3. Bars
Depositional Landforms

28. 3. Bars
Depositional Landforms

29. 3. Bars (p25)
• If a spit develops across a ____, it may
build across the two _________ to create
a bar. E.g. Slapton Ley in Devon.
• This only happens if there is no large river
________ as the current would stop the
spit reaching across both sides.
• A fresh water _______ develops as
rainwater catches in it and, over time,
dilutes the _____ water.
Depositional Landforms

31. Bar
• Use your notes to label the main features
of a bar onto your photo and map.
• Extra:
Can you add annotation to explain its
formation?

32. Homework
• Learn all your features of erosion and
deposition for a quick test next lesson.