Your SlideShare is downloading. ×
Ganges Delta
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Ganges Delta

6,862
views

Published on

Published in: Business, Technology

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
6,862
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Bangladesh Delta
  • 2. Aim: to understand the processes that lead to the formation of a delta
    • Define source, mouth, estuary, delta, load, alluvium
    • Recognise that rivers are agents of erosion, transportation and deposition
    • Understand how rivers transport their load
    • Understand the factors that lead to deposition
  • 3.
    • A rivers SOURCE IS ……
    • The work of a RIVER :
      • Erosion
      • Transportation
      • Deposition
      • EROSION
      • Attrition
      • Corrasion
      • Hydraulic Action
      • Corrosion
      • TRANSPORTATION
      • Traction
      • Suspension
      • Solution
  • 4.
      • DEPOSITION
      • A river deposits its load when it has insufficient energy to carry it. This may be caused by:
    • A decrease in the gradient (=a decrease in speed)
    • A widening or meandering of its channel
    • A decrease in volume (e.g. after a flood)
    • A decrease in velocity (speed) when it enters a lake or sea
  • 5. Main physical features of a delta:
    • Flat
    • Triangular in shape
    • Low lying
    • Alluvium
    • Marshy, colonised by marsh plants
    • Islands
    • Lagoons
    • Distributaries
  • 6. Islands lagoons distributaries
  • 7. Case study: Ganges delta Source of R. Ganges is in the Himalayas. The Ganges flows across its floodplain for over 1500km through N.India The Ganges delta is found at the mouth of the river as it flows into the Bay of Bengal The Indian city of Kolkata (Calcutta) lies on the western side of the delta. Most of the delta is in Bangladesh
  • 8. Facts and figures
    • These three rivers flow into the Ganges Delta:
    • Ganges ( Padma )
    • Brahmaputra ( Jamuna )
    • Meghna
    • It covers more than 105.000 km²
  • 9. Reasons for the formation of the Ganges Delta:
    • Material is eroded from the highlands
    • Deforestation also causes more sediment to be washed in to the river
    • Load is carried down stream
    • Flow of river slows down on reaching the sea
    • Deposition occurs
    • Sediment is deposited faster than the tides can remove it (tidal scour)
    • Deposits build up above sea level
    • River flow is blocked by so much deposition that he river splits up into distributaries
  • 10. Past Exam Q’s
    • 2005
    • Describe the main physical features of the area shown on the map (2marks)
    • Explain how the area has been formed. You may use diagrams to help your answer (6 marks)
    • 1996
    • Most of Bangladesh is part of the Ganges Delta. Describe the main physical features of a delta and explain how they are formed. You may use labelled diagrams if you wish (5 marks)

×