Les eaux du delta du Danube : approche géographique par télédétection satellitaire

Fabio Güttler 1
1 LETG - Brest - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : The Danube River and its contributors cross nineteen European countries before reaching the West coast of the Black Sea. In the context of the Black Sea drainage basin, the Danube River is the most important source of liquid and solid discharges. The fluvial-marine contact zone is quite large because Danube splits up itself into multiple distributaries across a wide deltaic plain (4,142 km²) shared among Romania and Ukraine. Vast areas of compact reedbeds usually surround the three hundred freshwater lakes of the delta. Many of these shallow lakes are connected to channels or canals providing turbid water from the Danube, while others depend on flood events to be supplied by the turbid waters coming from the river. Additionally, there are a few lakes almost isolated of this general water circulation. Important seasonal growth of floating and submerged macrophytes also occurs in the majority of the lakes. Analyzing spatial patterns in complex environments, like Danube Delta and its coastal zone, requires non traditional approaches. Remote sensing multi-sensor techniques offer reliable advantages to observe and understand intricate processes operating on different space-time scales and especially in large areas with difficult and sometimes restricted access (e.g. Biosphere Reserve core areas). The Danube Delta presents a complex hydrosystem which has been greatly modified since the first navigation works in the nineteenth century. Since the beginning of the nineties, the Danube Delta became a Biosphere Reserve (MAB-UNESCO), a RAMSAR site and was included on the list of the World Natural Heritage (UNESCO). The main methodological objective of this thesis was to create a procedure for processing heterogeneous optical satellite images. By studying the Danube Delta area (hydrosystems principally) through different space-time scales, we worked with several types of high and moderate spatial resolution images acquired from 1972 to 2011(AVNIR-2/ALOS, HRVIR/SPOT-4, ETM+/Landsat-7, TM/Landsat-4 and 5, MSS/Landsat-1, 2, 3 and 4, MERIS/Envisat). In brief, two turbidity retrieval methods, adapted to spatial and spectral characteristics of the sensors, were applied. These algorithms furnished reliable and inter-comparable information allowing simultaneous analysis of the Danube Delta waters observed by high and moderate spatial resolution sensors.
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Submitted on : Wednesday, February 20, 2013 - 6:55:45 PM
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  • HAL Id : tel-00790716, version 1

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Fabio Güttler. Les eaux du delta du Danube : approche géographique par télédétection satellitaire. Géographie. Université de Bretagne occidentale - Brest, 2012. Français. ⟨tel-00790716v1⟩

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