Abstract
The aim of this study is to determine and treat a hierarchical basis of the various mechanisms responsible for the space variation of the water quality in a endoreic semi-arid basin. The water chemistry showed a large variability in space and time. The total dissolved solid (TDS) in water increases from upstream to downstream due to the effect of the arid climate, but also due to the waterrock interactions and the anthropic polution of surface water. The water chemistry changes progressively from bicarbonate calcic upstream to sulphated and chlorinated calcic in the median zone to chlorinate sodic in the Sebkha. Thermodynamic modelling showed the major role of evaporation in the evolution of the water chemistry. The result indicated calcite precipitation then gypsum precipitation as well as cations exchanges reactions. Statistical approach allowed to arrange processes that responsible for the hydrochemical variability according to their important. The increase of water salinity is due mainly to the aridity process. The differentiation between salty surface water (Sebkha) and deeper water (Chott) is the second process. The combined of the geochemical and statistical methods allowed to identify the main variability sources of the water composition and to classify them in this complex system.
Highlights
The hydrochemistry of the semi-arid endoreic zones is marked by the phenomena of concentration of the solutions and salinisation under the influence of the evaporation
The objective of this work is to study the geochemistry of ground water in the endoreic basin of Rémila in order to put in evidence the processes which affect the quality of water and to organize them by coupling the geochemical and statistical approaches
The behaviour of the various major elements is studied by means of diagrams of concentration based on the ion chlorinate as factor of concentration (FC)[5,6,7,8, 9]
Summary
The hydrochemistry of the semi-arid endoreic zones is marked by the phenomena of concentration of the solutions and salinisation under the influence of the evaporation. In this context, the other mechanisms responsible for the acquisition of the chemical quality of water are masked by the factor concentration[1,2] To appreciate the variety of mechanisms responsible for hydrochemical variations requires the identification and the hierarchical organization of the processes. It is delimited to the North by Djebel Fedjoudj, to the South by Aures massif, to the West by Djebel Amrane and to the East by Sebkha.
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