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Lake Alaotra (Madagascar) is not about to disappear: Hydrological and sediment dynamics of an environmentally and socio-economically vital wetland

Ferry, Luc ; Mietton, Michel ; Touchart, Laurent ; Hamerlynck, Olivier

Dynamiques Environnementales - Journal international des géosciences et de l’environnement, 01 November 2014, Issue 32, pp.104-123

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  • Title:
    Lake Alaotra (Madagascar) is not about to disappear: Hydrological and sediment dynamics of an environmentally and socio-economically vital wetland
  • Author: Ferry, Luc ; Mietton, Michel ; Touchart, Laurent ; Hamerlynck, Olivier
  • Description: Lake Alaotra is the largest lake in Madagascar (456 km2). It is surrounded by marshland and irrigated perimeters of great economic value forming the “main rice granary” of the country. The basin also has an heritage and ecological value as a wetland protected by the Ramsar Convention (1971) and is home to a number of threatened endemic species. In reality the “lake” is just a vast shallow pool that seems doomed to silt up as the surrounding basin is affected by very strong erosion, the marks of which can be seen in the landscape («lavaka» or «tevana»). If Lake Alaotra is a transitional form destined to disappear, the question remains of how fast this will happen. In spite of repeated cries of alarm in the Malagasy media and also a few scientific affirmations, the silting up of the lake is not obvious. In a first approach, a critical analysis of arguments backing the hypothesis of rapid sedimentation in the lake is addressed. Subsequently, new data collected highlight the processes...
  • Is Part Of: Dynamiques Environnementales - Journal international des géosciences et de l’environnement, 01 November 2014, Issue 32, pp.104-123
  • Identifier: ISSN: 1968-469X
  • Subjects: Humanities and Social Sciences ; Geography ; Humanities and Social Sciences ; Environmental Studies ; Current ; Suspended Loads ; Wind ; Lake ; Bottom Transport ; Floods ; Rice Perimeter ; Catchment Management ; Aménagement de Bassin Versant ; Périmètre Rizicole ; Subsidence ; Madagascar ; Alaotra
  • Language: English
  • Source: Hyper Article en Ligne (CCSd)

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