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Comparison of different geostatistical methods to estimate groundwater level at different climatic periods
Author(s) -
Sadat Noori S. Mahmood,
Ebrahimi Kumars,
Liaghat AbdolMajid,
Hoorfar AbdolHossein
Publication year - 2013
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2012.00321.x
Subject(s) - groundwater , kriging , water table , geostatistics , hydrology (agriculture) , aquifer , environmental science , spatial variability , soil science , water level , variogram , geology , mathematics , statistics , geography , geotechnical engineering , cartography
The main aim of this study has been to assess the spatially variability of groundwater level at different climatic periods. The study area is S aveh‐ N obaran aquifer in I ran. 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 G aussian) 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.