This research investigates the spatial and temporal patterns of trends on monthly scale time series data (1950–2020) at meteorological, hydrological and hydrogeological monitoring posts located within the San river basin, which is a transboundary territory of Poland and Ukraine. The temporal trends were analyzed using the Mann-Kendall (MK) test at 5% significance level. The spatial variation of the magnitude of trends in temperature, precipitation, surface water level and discharge, groundwater level series was interpolated using the Inverse Distance Weighted (IDW) method in ArcGIS environment. The created maps of spatial variability of trends may help the water resource managers to figure out the risk and vulnerability related to climate change and improve the environmental monitoring network in the study region.
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