Hydrologie et environnement à la périphérie de Nîmes (Gard) : le paléochenal de la ZAC de la gare

摘要

The excavation of a paleovalley southwards of Nîmes concerned a side and a great part of the fillings of an ancient talweg : these fillings have been analysed on behalf of archaeology and paleoenvironment. These analysises revealed three succeding ways of proceeding of the stream. It is dynamic and an open cultivated landscape lines it until the lsl century A.D. Then and until the end of the IInd century A.D., the stream activity is so diminished that a path is made in the stream bed while the landscape enclosed. Then and until the end of the IIIrd century A.D., the alluvial activity stops and the erosion of the sides leads to the warping of the stream bed disappeared from the landscape more lately during the XIXth century. Explanation of this evolution is in the double impact of climate and human activities, especially the urbanization of the site of Nîmes during the first century A.D.