Modélisation hydro-géochimique du bassin supérieur de la Moselle

Abstract : This work investigates the possibility of using a pair of numerical models scaled for small watersheds to model greater scale basins (upscaling). It deals with two complementary approaches: the adaptation of the ASPECTS / WiTCh model pair to two small watersheds displaying contrasted geology and the study of the global behavior of the upper Moselle river basin. The first part of this project is the study of the ASPECTS / WiTCh model pair behavior and the adaptations it needs to produce satisfying results for two contrasted watershed in the Vosges mountains. The first site is located on the sandstones part of the mountain while the other one is on the granitic part. The model proved capable of predicting the daily water flows as well as the average annual concentrations measured in the streams on both sites but for a few elements on the granitic one. Seasonal variation in stream water acidity has been shown to be heavily contingent on the nitrogen cycle model. The second part of this project studies seasonal variations in the chemical and isotopic composition in the Moselle river on a two-week basis. Samples collected along the river confirm that the water composition is the product of two chemical poles mixing in and indicate that seasonal variations are mainly due to changes in the water flow. The basin could be represented by a two-layer model, the lower one for the low water periods, the upper one for the floods. Isotopic analysis let us characterize the relative contribution of these two layers during snow-melt but more precise rainwater data are needed for these samples to be used with flood analysis
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Mathieu Bureau. Modélisation hydro-géochimique du bassin supérieur de la Moselle. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL012N⟩. ⟨tel-01748822⟩

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