Determination of the origin of mineralization and groundwater salinity in the Adrar region in the southwest of Algeria

作者：KHELFAOUI Hakim,DAJBRI Larbi,LAKHAL Fatima Zohra,CHAFFAI Hicham,HANI Azzedine,SAYAD Lamine

摘要：To some extent, the sedimentary sequence with the largest groundwater reserves in northern Sahara is marked by a certain water table level, regionally known as the "Continental Intercalaire"(CI). "Continental Intercalaire"(CI) refers to "Continental Intercalary" widely distributed among three countries. Algeria, Tunisia and Libya, which have significant potential of water resources. As it is the only water resource relatively easily accessible to the inhabitants of the Sahara, it is widely developed. The physico-chemical characteristics of statistical processing in principal component analysis(PCA) and the chemical phase measurement of groundwater in the unconfined aquifer captured by "Foggaras"(traditional system irrigation composed of well system linked by a horizontal channel from their bases) and the deep drillings located in the study area were accessible. Therefore, there were some favorable conditions for comparing the chemistry of these waters with the standards of potability established by the World Health Organization. Then, the study detected the origin of excessive mineralization and the excessive content of Na, Cl, K, Mg and Ca that originated from the leaching of the clay and carbonate layers of the "Continental Intercalaire". In addition, the enrichment in NO2-, NO3- and SO42- was due to the excessive use of fertilizer in the whole region for shallower Foggaras waters, and this study also showed the dominant chemical facies of groundwater related to the significant abundance of these mineral salts in this thick aquifer horizon.

發文機構：University of 20 Ao?t 1955 Laboratory of Water Resource and Sustainable Development Faculty of the Earth Sciences

關鍵詞：SALINITYGROUNDWATERContinentalIntercalaireDRILLINGFoggaraAdrar

分類號： P641[天文地球—地質礦產勘探]