Influence of surface/groundwater interaction on pollution by pesticides in farmlands of the Fucino Plain,central Italy |
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| Authors: | Eva Pacioni Marco Petitta Ezio Burri Maria Fanelli Piero Mazzeo Fabrizio Ruggieri |
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| Institution: | (1) Earth Science Department, “Sapienza” University of Rome, P.le A. Moro 5, 00185 Rome, Italy;(2) Environmental Science Department, University of L’Aquila, via Vetoio, 67010 Coppito (L’Aquila), Italy;(3) Chemistry, Engineering Chemistry and Materials Department, University of L’Aquila, via Vetoio, 67010 Coppito (L’Aquila), Italy; |
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| Abstract: | This paper analyses flow and transport of pesticides from the unsaturated zone to groundwater so as to predict concentration
of those contaminants in the Fucino Plain’s groundwater, by site investigations and numerical simulations. Pesticides were
detected in surface water (peaks of 13 μg L−1) and groundwater (peaks of 0.37 μg L−1). Modelling tools made it possible to identify that pattern of precipitation, organic matter content, and root thickness
are the key factors involved in vertical seepage of pesticides. Numerical simulations indicated that a significant fraction
of contaminants is leached from the most surficial soil layers through runoff, while only a secondary fraction is mobilised
towards groundwater. Likelihood of contaminating deep groundwater is fairly low, whereas surface waters show higher susceptibility.
Results of the proposed conceptual hydrogeological model show that pesticides are more likely to be entrained by mixing of
stream water with shallow groundwater in periods of high water exploitation from shallow wells. |
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