Study of variation in groundwater quality in a coastal aquifer in north-eastern Tunisia using multivariate factor analysis

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• 作者：Sihem Charfi ; Kamel Zouari ; Saber Feki ; Ezeddine Mami
• 刊名：Quaternary International
• 出版年：2013
• 出版时间：17 July, 2013
• 年：2013
• 卷：302
• 期：Complete
• 页码：199-209
• 全文大小：712 K

文摘

This work focuses on the Grombalia aquifer which constitutes the main water resource in Northeast Tunisia, Cap Bon Peninsula. The recharge of this aquifer is ensured mainly by direct infiltration of rainwater through permeable layers.

Under semi-arid climatic conditions and increasing water demand for irrigation, about 80 % of the Grombalia aquifer system shows different vulnerabilities to anthropogenic activities. The total dissolved solids values range from 0.75 to 5.6?g/l.

Isotopic characterization with stable isotopes (¦Ä²H and ¦Ä¹⁸O) of Grombalia aquifer system identified geochemistry processes that control water chemistry. In addition, the multivariate statistical technique (Principal Component Analysis) was used to identify the origin, the recharge mode and geochemical processes controlling groundwater quality. The principal reactions responsible for the hydrochemical evolution in the Grombalia groundwater fall into three categories: (1) denitrification process; (2) dissolution of salts; and (3) irrigation return flow process. Tritium data in groundwater from the study area suggest the existence of pre1950 and post1960 recharge.