Assessment of Hydrogeochemistry and Groundwater Contamination of Shoush Plain Using Iso-Parameter Maps, Factor and Cluster Analysis
Subject Areas : Geopolitic
1 - ندارد
Keywords: Factor analysis, cluster analysis, Dedolomitization, Iso-Parameter
, 
, Maps, Bacterial Cantamination, Nitrate Cantamination,
Abstract :
Factor analysis of the hydrogeochemical data obtained in four rounds of sampling thegroundwater of Shoush plain reveals that the groundwater composition is largelycontrolled by the geochemical processes viz. dissolution, sedimentation and ionicexchange and surface activities such as agriculture have little effect on it. Amongstothers, gypsum dissolution is the greatest contributer in regional groundwaterevolution since it increases the concentration of calcium, magnesium and sulphate ionson one hand and reduces the alkalinity through the processes of dedolomitization andcalcite deposition. The dendogram resulting from the cluster analysis also indicates thedominance of bicarbonate type in the unconfined aquifer of Shoush plain. Thesimilarity of Iso-EC and Iso-Cl Maps illustrates the effects of evaporation on thegroundwater composition of Shoush plain. Nitrate contamination is localized and is notspread in the Plain while bacterial contamination is associated with human and animalwaste that are diffused from sewage outlets, cesspools and irrigation wastewater intothe environment. Pollution probability increases from NE to SW corresponding to theflow direction of the groundwater.