جستجوی مقالات مرتبط با کلیدواژه « کیفیت آب » در نشریات گروه « مهندسی معدن »

The geostatistical method is one of the most advanced techniques to assess and survey groundwater quality.  Using unsuitable water results in some problems such as soil salinity, reduction of soil permeability, decrease in water absorption by plant roots, diminution of crop productivity, or even menace agricultural production. Accordingly, in this study, the groundwater quality in the study's area for agricultural uses as well as industrial applications by using common diagrams and components related to the classification of water quality was investigated. ISATIS and Surfur software were used to illustrate changes in quality characteristics in the study's area graphically and Consecutive Gaussian simulations to analyze spatial connection among variables and estimate some of the quality indexes such as PH, RSC, Na%, SAR, and Ec. After data normalization, the variogram was calculated, and a sufficient model was selected to fit the experimental variogram based on the lowest SSR Error. Afterward, Consecutive Gaussian simulation in 100 samples in the study's area was examined using the fitted model based on the experimental model, and the maps resulting through simulation in different thresholds were provided. The results showed that the majority of samples have fairly suitable quality in terms of SAR, and in general, they are appropriate for agricultural uses. Percentage risk of Sodium in agricultural water in the study's area was also classified into the appropriate class. Except for four samples whose spatial connection of the forgoing cases have been interpolated and the interpolated probability maps have been provided, the water quality for industrial uses is susceptible to sedimentation in all statutes.

Gotvand-Olya Dam is located near Gotvand City, 25 km north of Shooshtar city in Khozestan province. The present research aimed at investigation on the influence of outcrop formations in the reservoir on the water quality (concentration of anions and cations, TDS, EC, and concentration of heavy metal strontium) at three levels of 150, 200, and 250 m. The results showed that Gachsaran and Mishan formations release the highest concentrations of anions and cations to the water in all three levels respectively. Concentration of strontium was especially high in the Gachsaran formation which is justified by the significant correlation between strontium and basic and sulfate environments. According to the effect of solubility rate of the Gachsaran formation in the levels of 150 and 200 m on the water quality after filling the dam, EC of water was estimated to be 36632 and 28872 S/cm respectively which is classified as very high saline water. The results have also shown that the salinity drops significantly at the level of 250 m and the water at this level is classified as high saline water. In the case of the effect of the Mishan formation, the classification of water in the three levels are the same as Gachsaran formation, only EC at the level of 200 m is more than the two other levels.

The study area is located 90 Km south-west of Qazvin in the structure zone of central Iran. The rock units of the area are comprised of a vast variety of carbonate, clastic and pyroclastic rocks, with age of Cambrian to Oligomiocene, that have significantly outcropped in the area. This research is based on assessment of 369 springs around the Avaj-Abegarm region. 23 of them are karstic springs that are located in the limestone of Qom formation, Lar formation and the limestone of Cretaceous. The discharge variation of these springs is affected by lithology, degree of crushing and tectonic fracturing, degree of karstification of carbonate rock, amount of precipitation and type of aquifer in the region. Based on chemical analysis done on 5 samples that were taken from large karstic springs in the area, the type and facies of spring's water are sodium-bicarbonate and sodium-chloride. Hydrochemistry of karstic aquifers in the area is influenced by solubility of carbonate rock of Qom formation and Lar formation, surface recharge from Upper red formation mixed with upwelling of deep brine in Cretaceous carbonate rock that probably have hydrothermal geneses.