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The main aim of this study has been to assess the spatially variability of groundwater level at different climatic periods. The study area is Saveh-Nobaran aquifer in Iran. First, using two drought indices, different climatic periods in the region including wet, normal and dry during 1993–2003 were recognized. Second, with the use of measured elevations of the water table, experimental semivariograms (spherical, exponential and Gaussian) were constructed that characterize the spatial variability of the measured groundwater levels. Groundwater levels were interpolated by four different geostatistical methods. RMSE, MAE and R 2 were calculated to determine the best method. The R 2 coefficient obtained from kriging, cokriging, TPSS and IDW methods were 0.95, 0.97, 0.89 and 0.83, respectively. Cokriging method was used to create groundwater-level maps, including maximum, average and minimum water levels for each climatic period. The results obtained from geostatistical analysis showed that groundwater depth varies spatially in different climatic conditions. |
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