2. Wide valleys often include
Floodplains
Erosional floodplains
Depositional floodplains
Meanders
Cut bank and point bar
Cutoffs and oxbow lakes
3.
4. Flood Plain – is a broad strip of land built up
by sedimentation on either side of a stream
channel.
During floods, flood plains may be covered
with water carrying suspended silt and clay.
When the flood water recedes, these fine-
grained sediments are left behind as a
horizontal deposit.
5. The sudden decrease in velocity of water
leaving the channel causes the river to deposit
most of its sediment near the main channel.
Progressively less sediment is deposited away
from the channel
A series of floods may build up natural levees
- low ridges of flood-deposited sediment that
form on either side of a stream channel
6.
7.
8.
9.
10.
11. Remnants of former floodplain
River adjusts to drop in base level by
down cutting
12.
13.
14. Occur where bed (sediment) load is very high.
Often big boulders in the stream.
Many channels because mid-channel bars split
the stream.
Adjacent to mountains in high rainfall areas.
15.
16. Definition: These are mounds of alluvium
(material deposited by running water) piled up
along the river's edge, each time the river
floods.