Comparative analysis of the transference of suspended and chemical deposits in the river basins of the White Timok and the Black Timok

Abstract

The river basins of the White Timok and the Black Timok are situated in East Serbia. Petrologically they differ very much from each another: in the river basin of the Black Timok (1,199 sq km) there predominate limestones (39%) and andesites (34%); in the upper part of the river basin of the White Timok (1,245 sq km) magmatic-metamorphic rocks (60.4%), and in its lower part (905 sq km) maritime-lacustrine sediments (36%). As the above mentioned river basins differ from one another also from hydrological point of view, the object of this paper was to establish the total evacuation of suspended and chemically dissolved deposits, as well as its structure. The greatest evacuation of deposits is in the very liver basin of the White Timok (224,8 t/km^2/year), and the least one in the river basin of the Black Timok (68,7 t/km^2/year). These two river basins basically differ from each other also by the structure of evacuated materials: in the former there predominates silt (82,8%), and in the latter chemically dissolved matters (94,9%). On the basis of relations, in which E is the sum of evacuations of suspended and chemically dissolved deposits (mg/km^2/s and q specifical flow-off (1/s/ km^2), it can be concluded that for the same abundance of water the immediate part of the water basin of the White Timok is 8,3 times ämore credible' than the river basin of the Black Timok.