Possible transportation routes of heavy metals in floodplains 1st AARC PhD Students Conference on Environment and Sustainble Energy 24-25 November 2016 University of Maribor Possible transportation routes of heavy metals in floodplains (case study: Drava River floodplain, Hungary) Tóth G. – Halász A. – Dezső J. – Lóczy D.

Old-Drava Rehabilitation Programme (ODP) ”ecologically sustainable and cost-effective water supply” Drava river 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Research area of Univ Pécs (2013-14) Cún-Szaporca oxbow „check the ODP plans” planned pipe or channels for water recharge and regulation lakes, oxbows under revitalization planned reservoirs sluices settlements forests with planned irrigation arable with planned irrigation

THE CÚN – SZAPORCA OXBOW

Methods In field: Laboratory measurements and experiments: Soil and sediment sample collection Pumping tests Laboratory measurements and experiments: Measuring background parameters: pH, grain size distribution analysis Heavy metal examinations: Niton XL3t 600 XRF Analyser Calculating hydraulic conductivity

Contaminants Cr Co Ni Cu Zn As Pb Limit value (ppm)* 75 30 40 200 15 100

Hydraulic well tests From field measurements the hydraulic conductivity of wells inhomogeneous zone is k = 1.78 x 10-5. clayey sand 72 hours long well test in four well at the depths of 10-100m The hydraulic conductivity at the depth of 40m is similar to the shallower one is k = 1.50 x 10-5 but at depth of 115m is k = 3.44 x 10-6

Conclusion Some of the heavy metals concentrations are above the limit value Accumulation zone is at 10-30 cm Theoretical calculations vs. In field experiments The highest balanced weter level is at 1 m so the contaminants can’t mobilize In the case of floods this could still mean a problem

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