| چکیده انگلیسی مقاله |
 Evaluation of spatial interpolation methods for water quality zoning using GIS Case study, Abadeh Township    Y. Maghami. R. Ghazavi. A. A. Vali. S. Sharafi  Received: 20 January 2010 / Accepted: 17 August 2010, 35-36 P        Extended abstract  1- Intro duction  Determination of water quality is important because of it helps to protect, restore the quality of the ground-waters, and management of groundwater that consistent with the requirements of the clean water. Schouller diagram is one of the best methods for groundwater quality zoning. The most important stage of groundwater quality zoning in this method is investigation of the best interpolation method. In these regards, Geographic Information System (GIS) provides an effective tool to generate, manipulate, and organize the spatially disparate data for modeling and groundwater quality zoning. The produced graphical image using GIS will provide for user an easier visual inspection of the water quality conditions.    This study investigates the best interpolation method for water quality zoning by schouller diagram using GIS.   2- Methodology  The study site named Abadeh located in 250 km North of Fars, Iran (between 30º , 53â and 31º , 31â North latitude and 52º , 31â and 53º , 10â Eastern longitude.)  27 observed wells in Abadeh Township, located in an alluvial area with an unconfined aquifer were used for groundwater quality zoning. Groundwater quality zoning accomplished using different interpolation method (kriging with liner, circuler, spherical and Exponential and Gousian semi variogram, IDW and Spline). In order to groundwater qualification via Schouller diagram, quality index was determined. Schouller diagram is a graphical method for water quality classification. Water quality was investigated to 6 categories in the diagram including: good quality, acceptable quality, moderate quality, unsuitable, unsuitable completely, and unsuitable for drinking.    3- Discussion  Root mean square errors and mean deviation errors were used for comparison accuracy analysis results obtained from different interpolation method. The result showed that the kriging method with Exponential and circuler semi variogram is the best methods for interpolating the drinking quality water in the study area. These results were reported by other researchers.   4- Conclusion  The results of interpolation methods in the study area indicated that two sub areas had unsuitable drinking water one in the north and other one in the east. TDS and TH maps indicate also the same results. Based on the results of this study, have been suggested that water quality determine using all factors such as anions and cations amount, pH and other effective parameters. 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A. student of Geomorphology, University of Tehran, Tehran, Iran. |