Delta formation
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Delta formation

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Delta formation Delta formation Presentation Transcript

  • Delta Formation• Areas of sediment deposited at the mouth of river• Fast moving water enters a slowing moving body such as sea or lake• Discharge, and therefore competence, reduces dramatically - resulting in deposition ofeven very fine material• Flocculation occurs when salt water meets fresh water – clays stick together and sink tofloor• Highly changeable landforms as sediment is unconsolidated – erosion and incursion by thesea too• Deposition rate must be greater than erosional rateSo – 2 major conditions:• Form on rivers with high sediment rate (Mississippi – 450m tonnes a year)• Rivers flow into bodies of water with little wave action (Nile into the Mediterranean)
  • Arcuate • Nile Delta, Egypt • Rounded, convex margin
  • Cuspate • Apalachicola River Delta, Florida, USA • Tiber, Italy • Material spread evenly either side of estuary • ‘Tooth’ shaped
  • Bird’s Foot • Mississippi Delta, Louisiana, USA • Many sediment- bounded channels extending out in a fan shape.