Davraz Mountain, Isparta, Carbonate Aquifer, Hydrogeochemical Process, Conceptual Model

• Published in: Mühendislik Bilimleri ve Tasarım Dergisi
• Main Author: Demer, Selma
• Format: Article in Journal/Newspaper
• Language: Turkish
• Published: Süleyman Demirel Üniversitesi 2023
• Subjects: Davraz Mountain;Isparta;Carbonate Aquifer;Hydrogeochemical Process;Conceptual Model; Davraz Dağı;Isparta;Karbonat Akifer;Hidrojeokimyasal Proses;Kavramsal Model; Geological Sciences and Engineering (Other); Yer Bilimleri ve Jeoloji Mühendisliği (Diğer); Carbonic acid
• Online Access: https://dergipark.org.tr/tr/pub/jesd/issue/78081/1248714; https://doi.org/10.21923/jesd.1248714

In this study, to determine the hydrogeochemical evolution of the groundwater in the Davraz Mountain (Isparta) carbonate aquifer, the hydrogeochemical conceptual model of the waters was defined depending on the tectonic and geological characteristics of the region. A total of representative twenty-one groundwater samples were collected from the study area and it was determined that the waters were divided into three different groundwater facies: (a) Ca-HCO3, (b) Ca-Mg-HCO3, and (c) Ca-Mg-HCO3-SO4. In some samples partially high SO42- and NO3- concentrations are associated with domestic and agricultural activities. The main factor controlling the groundwater chemistry in the study area is the water-rock interaction and the dissolution of calcite and dolomite is the dominant geochemical process. The pCO2 values of the groundwater samples in the study area were higher than the atmospheric pCO2 also accelerated the carbonate dissolution. Thus, calcite and dolomite, the main mineral phases in the aquifer were dissolved by the water-rock interaction and increasing the Ca and Mg concentrations of the waters. The positive SIcalcite and SIdolomite values of the waters show that these minerals control the hydrochemical composition of the groundwater in the aquifer. The mineral stability diagram for the carbonate system shows that the waters in the study area are in equilibrium with Mg-calcite and that Mg-calcite is the main carbonate mineral in deep reservoirs. According to the hydrogeochemical conceptual model, precipitation waters falling on carbonate rocks took some carbon dioxide from the atmosphere and formed carbonic acid. While this water was infiltrated underground, it dissolved Ca2+, Mg2+, and HCO3- in the carbonate rocks in which it circulated, resulting in the formation of Ca-HCO3 and Ca-Mg-HCO3 waters. Bu çalışmada Davraz Dağı (Isparta) karbonat akiferindeki yeraltısuyunun hidrojeokimyasal evrimini belirlemek amacıyla, bölgenin tektonik ve jeolojik özelliklerine bağlı olarak suların hidrojeokimyasal ...