Download presentation
1
Delta
2
Where can you find delta?
Mouth of river
3
What is a delta? A flat depositional plain formed at the river mouth
4
Types of delta
5
Arcuate delta Triangular in shape E.g. river Nile, Egypt, Africa.
6
Map of Nile
7
The Nile Delta Satellite Image
8
Bird’s foot delta Look like a bird’s foot
E.g. river Mississippi, U.S.A, North America.
10
Mississippi Delta Satellite image
11
Estuarine delta No particular shape
E.g. river Amazon, Brazil, South America. Estaurine delta
12
The Amazon River
13
Satellite image of Amazon river mouth
14
A B Examples from China C
15
Huang He Satellite image
Arcuate delta
16
B Chang Jiang delta p. 48 Shanghai Satellite image Estaurine delta
17
C. Zhu Jiang Delta Estaurine delta Satellite image
18
Discussion What are the uses of delta to man? Explain your answer. Quote examples. What are the favourable conditions for the formation of delta? (Think in terms of the river characteristics and the coastal environment……)
19
The uses of delta …..
20
And many more ….
21
Conditions favouring the formation of delta
Characteristics of the river River carries a large load There are few or no lakes along the river
22
Characteristics of the coastal environment
Sheltered bay Weak tides and waves Removal of sediment is slower than deposition Gentle offshore slope Shallow sea Presence of vegetation
23
Formation of delta When a river bring down a large amount of sediment
River reaches the sea, it slows down Particles group into larger and heavier particles (flocculation process) When sediment is deposited faster than it can be removed, delta is formed
24
Exercises Complete the worksheet Homework – Nam Chung River, p.55-56
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.