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HYDROLOGIE ET GEOCHIMIE ISOTOPIQUE DU LAC MASOKO ET DE LACS VOLCANIQUES DE LA PROVINCE ACTIVE DU RUNGWE (SUD-OUEST TANZANIE)

Abstract : Lakes constitute potential and natural freshwater reservoir which are today not systematically considered anymore as simple pluviometer. Exchange and regulation places, lakes can be places of concentration where polluants accumulate or opposite places of dilution, which are favourable to the preservation of water ressources. This thesis focus on quantitative and qualitative aspects of the potential freswater reserve of Lake Masoko and others volcanic lakes of South West tanzanian few or never studied. This work gives evidence that the lake-levels and the balances of these systems are controlled by positive exchanges with atmosphere from which, result important groundwater fluxes. It was also shown that these mostly closed lakes constitute dilution places. These hydro-systems show also mineralisation degree and type, which appear control by first, the contribution of hydrothermal inflows to the lakes and secondly, by the lake water residence times. This hydrological and geochemical study of South West tanzanian lakes, under actual regional hydroclimatic conditions, allows to show that the mineralization degree of studied systems could rise under increase of precipitation rates or, decrease of evaporation rates; both in favour of the contribution of inflows to the lakes. Lake mineralization increases would be, in this region, linked to wet climatic conditions at YD and LGM whereas opposite interpretations are usually considered.
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Submitted on : Wednesday, July 8, 2009 - 7:06:54 PM
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Manuëlla Delalande. HYDROLOGIE ET GEOCHIMIE ISOTOPIQUE DU LAC MASOKO ET DE LACS VOLCANIQUES DE LA PROVINCE ACTIVE DU RUNGWE (SUD-OUEST TANZANIE). Hydrologie. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00403009⟩

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