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2011

Temporal and Spatial change of Groundwater quality in Shahr-e-Babak plain for Agricultural the base Wilcox and FAO

Author:Ali Azareh, Mohsen Mohseni Saravi, Sosan Salajegheh and Masood jafari Shalamzari

Abstract:
In recent years, increased water use and decreased precipitation have led to increased pressure to groundwater resources, this its quality decrease. Therefore, the main reasons for studying groundwater are potential hazards for groundwater contamination and protect it (ground water) from contamination: te main purpose of this research is the assessment of spatial and temporal trends in ground water quality in Shahr-e-Babak plain to besides of measurement of variation trends, by identifying contaminated regions (for agricultural purposes) issues and problems raised due to contaminates water usage could be prevented for this reason, data related to qualitative parameters of ground water such as EC, SAR, TDS during inventory period 2002-2009 were used. After fitting the best variogram model to empirical model of each of qualitative parameters of Ground water, by Arc GIS 9.3 software and by using Kriging interpolation method. Zoning maps of the region were prepared. Also the water of the region in the view point of agricultural use, was assessed using Wilcox and FAO method results obtained from this research showed that from comparison between Kriging interpolation and inverse distance weighted, Kriging method have the higher precision (based on low RMSE and MAE) than IDW. Also result from water classification based on Wilcox show the increased contamination trend especially in southern parts, and generally in this period the water of the region is classified as moderate-quality water, and also in FAO method contamination trend of waters in this region is increasing and in this method southern parts of this region are classified as the most contaminated parts (water classed with high salinity) of the region. The reasons of contamination of southern parts of the region are the type of Geological of the region and also high agricultural activities.