Föroreningstransport i den omättade zonen under olika nederbördsscenarion / Unsaturated solute transport under different rainfall scenarios
Pollutant transport in the unsaturated soil zone is a potential threat to surface and ground water resources. The intensity and volume of rainfall are the parameters that decide how fast and deep the pollutants will be transported. Climate models predict a future rainfall climate with higher total volume and higher intensities. In the present study we try to assess effects on unsaturated solute transport of a future rainfall climate. In the present study we investigate the effects of the estimated precipitation change on unsaturated solute transport in two different soil types in southern Sweden using the numerical model HYDRUS-1D. Three different precipitation input data were used, direct output from a high resolution climate model and downscaled climate model data using delta change (DC). The results presented in this paper shows that DC gives more realistic solute transport depths compared to using climate model data. Using DC data it is predicted that the solute transport depths will increase during the mid of the present century and the return to levels similar today’s. Different soil types can give different response using the same precipitation input, therefore more studies are needed in different parts of Sweden using different soil types.