Kriging of Groundwater Level - A Case Study of Dibdiba Aquifer in Area of Karballa-Najaf
journal of kerbala university,
2007, Volume 3, Issue 3, Pages 170-182
AbstractThe application of the spatial statistical technique (kriging) is used in this research, for the spatial analysis of groundwater levels is shown. The data set consists of groundwater levels measured at about 13 hand dug wells were selected in the studied area for the observation water table (vary for ten month, from June 2002 to March 2003 ) in an area of 20x20 km2 Dibdiba hydrologic basin; which lies between Karbala and Najaf provinces. With the use of measured elevations of the water table, experimental semivariograms were constructed that characterizes the spatial variability of the measured groundwater levels. The experimental semivariograms were fitted into many models as Spherical, exponential and gaussian semivariogram. The finally selected models were used to estimate the groundwater levels and estimation variance (which express the accuracy of the estimated groundwater levels) at the nodes of a square grid of 2.5km x 2.5km and to develop corresponding contour maps .Also, used the Inverse Square Distance (ISD) method in order to interpolate the groundwater levels for the study area. It was found that ISD method resulted in higher errors as compared to kriging method. The groundwater table maps resulted by kriging method were compared with the groundwater table maps prepared using the ISD method.
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