Study of groundwater temperature spatio-temporal variation in the city of Wroclaw. Preliminary results.

Abstract In Wrocław over the past 20 years, recorded increase in average ambient air temperature is approx. 0.5 °C. addition, urbanisation has created a phenomenon called Urban Heat Island (UHI). The combined effect of UHI and climate change can influence groundwater by penetrating underground. elevated temperatures urban areas Subsurface (SSUHI). This study focuses on spatial distribution shallow aquifers city Wroclaw. was analysed based maps developed with various interpolation techniques. results measurements network 65 piezometers conducted 2004-2005 hydrological year have been used this study. show seasonal variation lowest February (1.3 °C) highest August (24.5 annual 13.2 data processed Inverse Distance Weighted (IDW), Radial Basis Function (RBF) Kriging methods. Furthermore, cokriging method multivariate linear regression models to assess if variable such as distance from centre improve performance expressed RMS error value. It established that univariate model produced best (RMS equal 1.33 improved accuracy interpolation.