La Seille : un système fluvial anthropisé (Lorraine, France)

Abstract : Long of 120 km, La Seille takes its source at the exit of the Pond of Lindre and joins he Moselle in Metz. Its catchment area (1291 Km²) is characteristic of the Lorraine plate Northern Is France) with a geological substratum primarily marno ?calcareous which belongs o the sedimentary sequence of Sorted higher and of Lias. a Seille was particularly arranged during its history, and the impact of the human nterventions resulted in many changes and degradations on the layout, the minor bed and the ajor bed. In order to better include/understand the changes of the river system we try to dentify, through time, the influence of installations on hydrological operation. The objectives of the thesis are articulated around two principal topics : to propose a method which makes it possible to explain the transformations morphodynamics through which is perceived the changes of the river system. to analyze the river landscape and the complex reports/ratios which the human society maintains with the river medium. To solve such problems supposes the use of a method transdisciplinaire; from where the choice of a step which associates historical research the study of the current tendency of the river. The history does not constitute a goal but a means to reconstitute the landscape of the past. The objective is to show the influence of the successive human interventions on the current landscape according to a historical optics. The adopted step is articulated around three research orientations: to determine the hydrological operation of a catchment area where the anthropic influences strong and are varied. These influences have involved a slow response of the hydro-system, perceptible for one half-century. to analyze the extreme hydrological situations (risings, low water levels) in the chronicles of the hydrometric stations and to seek outstanding events in the hydrological history of the river. We insisted on the risings because it is at the time of those that the most visible modifications of the river bed and the river occur. The objective of this part is primarily to highlight the role of the bed loads and liquids in the dynamic morpho of the river. to identify the evolution of the river bed on two scales of time: the historical scale (counted in centuries): who has included the study of the old air photographs (missions, 1958,1967, 1968 and 1999) and the summary of the installations carried out for the XIII 2nd century (study of the layout, and old profiles transversely) the contemporary scale (counted in years or tens of years): who rests primarily on the observations of ground: cartography of river morphologies of the minor bed and the major bed, realization of the profiles transversely (be 2004), and treatment of the orthophotoplans (2000). These approaches make it possible to include/understand the changes of the river system which is directed towards a total anthropisation of the landscape which is associated for him. Today of great projects are engaged, in particular, for the monitoring and the maintenance of the river to try to preserve a "natural" landscape
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Mohamed El Ghachi. La Seille : un système fluvial anthropisé (Lorraine, France). Histoire. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ015L⟩. ⟨tel-01748994⟩

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