Hydrochemical constraints between the karst Tabular Middle Atlas Causses and the Sa s basin (Morocco): implications of groundwater circulation

摘要

The karst Tabular Middle Atlas Causses reservoir is the main drinking-water supply of Fez-Meknes region (Sa s Basin) in Morocco. Recent analyses showed a decline in associated groundwater chemical quality and increased turbidity. To understand this hydrosystem, four surveys were undertaken during fall and spring, 2009-2011. Hydrogeochemical studies coupled with isotopic analyses (delta O-18, delta D and Rn-222) showed that the aquifers between the causses (mountains) and the Sa s Basin are of Liassic origin and at the southern extremities are of Triassic origin. Five recharge zones of different altitudes have been defined, including two main mixing zones in the south. Deuterium excess results suggest local recharge, while a plot of delta O-18 versus delta D characterizes a confined aquifer in the eastern sector. Rn-222 results reveal areas of rapid exchanges with an upwelling time of less than 2 weeks. A schematic conceptual model is presented to explain the groundwater circulation system and the behavior of this karst system.