engleski

Water flow and solute transport modelling in soil at Kosnica site

The subject of this study is the soil zone above Zagreb unconfined Quaternary aquifer in which high concentration of several toxic metals were observed probably caused by industry, traffic, agriculture and urbanization. The goal of the study is land use impact assessment on groundwater quality, by 1D modelling of water flow and solute transport using Hydrus software. Investigated site is situated about 800 m from right bank of Sava River at Kosnica water capture site where Fluvisol type of soil is developed. The following soil horizons were recognized: O ; A ; AC ; C ; 2C/Cl ; 3 C1 ; 4Cl/Cr ; 5Cl/Cr and 6Cr. Soil is silty to sandy in texture. Soil pH increases while electrical conductivity generally decreases with depth. Air capacity is higher in the upper part of soil profile, while bulk density has opposite trend. All soil horizons are porous and have medium water retention capacity. One year monitoring of water content, electrical conductivity, soil water tension and concentration of metals in percolating water is in progress. The monitoring takes place at two different depths of the profile. The parameters stated are necessary for calibration of models. Results of electrical conductivity monitoring show no significant changes along profile. Soil water tension is higher in the upper part of the profile. Water content depends on weather conditions (varies from 17% to 35%). The results of this study will contribute to better understanding of metals migration through the soil zone and allow risk assessment of possible groundwater pollution.

Modelling; soil; solute transport; Kosnica

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