Simulation d'une pollution sur un champ captant aupres d'un fleuve—suivi dans l'espace et dans le temps a partir d'un traceur NaCl á l'aide d'une méthode électrique

The aim of the technique described here is to follow displacement of a NaCl trace (brine), simulating pollution, in extent and time, from a river towards water boreholes in operation. 30–50 V electrodes, monitored simultaneously through passage of a direct current, provide the position of the NaCl “cloud” and in what time period it has appeared at each electrode in relation to the initial ground conditions prior to introducing the brine. Preferred seepage paths, foci of pollution flow, are thus exposed. The sequence of readings has been specially formulated with this objective in mind.A full-scale example of the application is presented (River Ain, France).