Evolution of Coastal Landforms in the Western Part of Sri Lanka

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Other Title
  • スリランカ西部における海岸地形の地形発達史
  • スリランカ西部における海岸地形の地形発達史〔英文〕
  • スリランカ セイブ ニ オケル カイガン チケイ ノ チケイ ハッタツシ エイ

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Abstract

Geomorphic and geologic evidence shows four different stages (Stage I-IV) in the evolution of coastal landforms on the west coast of Sri Lanka during the late Pleistocene and Holocene Epochs. The author assumes that the old ridges in Stage I at Sembukulama, Kiriyankalliya, Pambala, Wirahena, Uluambalama and Kadirana areas have been formed preceding the Holocene transgression. Low hills and ridges in the area were coated mainly by wind blown sand, following the lower sea levels during the Late Pleistocene and Early Holocene Epochs. Radiocarbon datings on the west and south coasts reveal that the sea level remained 1 m or more above the present sea level between 6170±70 and 5350±80 yr B. P. During this transgression, the former drainage basins were submerged and headland bay beaches were created. Many wetlands and beach ridges, particularly in Stages II, III, and IV were gradually formed owing to minor oscillations of sea level after mid-Holocene. Most of these landforms have a close relationship with main climatic zones of the country.

Journal

  • GEOGRAPHICAL SCIENCES

    GEOGRAPHICAL SCIENCES 43 (1), 18-36, 1988

    THE JAPANESE SOCIETY FOR GEOGRAPHICAL SCIENCES

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