M. Puric et al. : Effects of Tributaries on River Water - Sediment Interactions
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MONTENEGRO
I "
o 10 20 3J km
,
Figure 1. Tara drainage basin with sampling locations.
The corresponding distribution of parameters reveals the existence of two factors
(Fig. 5), primarily determining the total uncontaminated model. The first factor
(,Factor 1', horizontal axis) represents the observed geochemical contrast between
the flysch and the limestone regions, reflected in water and sedim~nt
characteristics. Significantly correlated with the 'carbonate pole' (HC03-, C0 3 - ,
Ca, etc.) is the Cd-content of sediments, 'CdM' and 'CdH' (suffix 'W' for dissolved,
suffix 'M' for MgCl2-extracted and suffix 'H' for HCL-extracted); Cd has already
been shown to become associated with carbonates. The 'flysch pole' is represented
by other heavy metals, indicating their sorption onto 'non-carbonate' substrates
(iron and manganese oxides, silicates, etc.).
The second factor (,Factor 2', vertical axis), found to contribute significantly to
the model variability, represents the mobility of metals. The poles identified
within this factor are the 'temperature pole' ('t'), and the 'oxygen pole' ('02',
Fig. 5), revealing much more than the simple fact that higher temperature results
in lower 02 content.