1. 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.

3. 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 ( )
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

4. THE CÚN – SZAPORCA OXBOW

5. 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

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

9. Hydraulic well tests
From field measurements the hydraulic conductivity of wells inhomogeneous zone is k = 1.78 x clayey sand
72 hours long well test in four well at the depths of m
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

10. Conclusion
Some of the heavy metals concentrations are above the limit value
Accumulation zone is at 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

11. Thank you for your attention!