Evolution de la composition chimique des ruisseaux vosgiens : Analyse rétrospective et effet d'un amendement calco-magnésien

Abstract : Our work is based on (1) a functional analysis of a long term in the chemical composition of streams since fifty-years, (2) an experimental liming of catchments. The historical analysis showed an acidification and a continuous demineralization of water draining sandstone since fifty years. The acidity and the mineralization of streams draining granites rich on weatherable minerals have decreased since thirty years. In the area covered by granites rich in Na plagioclase, which is drained by many acid streams, mineralization has decreased since twenty years and Al concentration have decreased since ten years, without pH changes. The experimental input of dolomite and dolomitic limestone, gypsum and KCl has caused a sudden and durable increase in Ca, Mg and pH in the stream of granitic catchment riche in sodium plagioclase. The dynamic of chloride showed a rapid contribution of soil waters to the humid area and stream, while a small fraction has infiltrated deeper into the soil. On sandstone, except a direct effect during the flood following the liming, the increase of concentrations was very small. The majority of chloride, Ca and Mg are infiltrated deeper into the permeable sandy soils, without contributing directly to the stream flow. Hydrologic, isotopic, chemical arguments suggest that the mean residence time of water and mineral elements in catchment is of several decades This work supports the scientific material for a reasoned politic of acidity correction of stream water in the Vosges mountains.
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Nicolas Angeli. Evolution de la composition chimique des ruisseaux vosgiens : Analyse rétrospective et effet d'un amendement calco-magnésien. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10096⟩. ⟨tel-01754317⟩

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