engleski

Impact of geomorphological variables in weighing the lithological influence on geochemical composition of stream and overbank sediments: a regression model for the Žumberak Area (NW Croatia)

The two multiple regression models were compared on the assumption that the geochemical composition of the alluvial material derives its origin basically from the bedrock lithology of a drainage basin. The latter was integrated with both stream sediment and overbank sediment geochemical data via the two essentially different approaches as regards the catchment basin geomorphological data: 1) as the relative area of influence representing a portion of the catchment basin occupied by a certain rock type ; 2) as the relative of influence representing a narrow tract of a certain rock type traversed by majority of the perrenial streams which form the active stream network. The model comparison was accomplished on the basis of the goodness-of-fit test for both experimental designs and for the same set of data. The most important result of these experiments highlights the linear approach as the more appropriate model of the lithological influence on the analyzed sample media.

drainage basin; channel-reach morphology; sediment supply; lithology; geochemical composition; stream sediment; overbank sediment;

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