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Table 3 Semi-variance function model parameters of groundwater level (2001–2013)

From: Geostatistical interpolation model selection based on ArcGIS and spatio-temporal variability analysis of groundwater level in piedmont plains, northwest China

Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Nugget value 79.3 83.5 90.3 81.6 83.8 92.3 116.9 129.6 106.6 97.2 99.2 103.1 107.2
Partial sill value 135.6 124.9 115.8 105.1 103.9 78.3 63.0 48.9 72.3 87.2 85.6 82.1 78.2
Sill value 214.9 208.4 206.1 186.7 187.7 170.6 179.9 178.5 178.9 184.4 184.8 185.2 185.4
Nugget effect 0.37 0.40 0.44 0.44 0.45 0.54 0.65 0.73 0.60 0.53 0.54 0.56 0.58