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Coastal plains

March 31, 2021 by Bhushan Leave a Comment Last Updated April 1, 2021

Table of Contents hide
1 Structural features.
2 Genesis.
2.1 Coastal Plains

Structural features.

  • coastal plains are depositional plains along the peninsular coast
  • They are younger and will have alluvium
  • Predominantly river in aluvium and less marine alluvium
Western coastEastern coast
Narrow.
broader.
short swift streams that don't carry enough sedimentsBecause bigger rivers more sedimentation
steep slope. Sediments don't accumulategentler slopes. So sediments accumulate
rivers terminate at estuariesrivers terminate at delta
favourable location for portsnot favourable for ports because Eastern coast require continuous maintenance and dredging
coastal plains - east vs west

Genesis.

  • eastern and western coastal plains are mostly composite plains.
  • composite planes have features of submergent emergent and features of neutral coastline.
  • Malabar - emergent smoother lagoons. Vembanad lagoon, ashtamudi lagoon Kollam
  • Canara Karnataka - submergent coast
  • Konkan - submergent and emergent
  • Kathiyawar - submergent and emergent
  • Coromandel - emergent lagoon pulicat lagoon
  • Andhra - submergent
  • Odisha - emergent chilika lake shot Island wheeler Island kalam Island
  • Bengal coast - evidences of river rejuvenation

Coastal Plains

  • Depositional plains along the peninsular coast
  • Younger and have alluvium (Riverine alluvium - (predominant) and Marine alluvium)
EASTERN COASTAL PLAINSWESTERN COASTAL PLAINS
WidthBroadNarrow
RiversLarge
hence more sedimentation
Short swift streams
SlopeGentle
So Sediments accumulate
Steep
Fewer sediments
PortsDeltaic deposits
Not favorable to Ports
Require continuous maintenance & Dredging
Rivers terminate @ Estuaries
Good location for ports
GenesisComposite Plains - (Submergent + Emergent + Neutral)
COROMANDEL
-Emergent
- Lagoons (Pulicat lagoon )
ANDHRA COAST

- Submergent
ODISHA COAST

- Emergent
- Chilka lake
- Shortt Island, Wheeler Island (Kalaam Island)
BENGAL COAST

- Evidence of River rejuvenation
- IMTR (Interim Missile Test Range)
Composite Plains - (Submergent + Emergent + Neutral)
MALABAR
- Emergent, Smoother
- Lagoons - Wayambanad lagoon & Kollam / Ashtamudi lagoon
KARNATAKA / CANARA
- Submergent
KONKAN
- Submergent and Emergent
KATHIAWAR
- Submergent and Emergent
Eastern & Western Coastal Plains

Filed Under: UPSC

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