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THE COMPARATIVE ANALYSIS OF THE RIVER NETWORK CHANGE IN THE BASINS OF VORSKLA AND TIKHAYA SOSNA RIVERS FOR HISTORICAL TIME: BELGOROD OBLAST

Белеванцев В.Г.
In the basin of the river Vorskla at the end of XIX century, the reduction of the river network was 27 %, and by the end of XX century - 46% relative to the end of XVIII century. In the Tihaya Sosna river basin these values amounted to 52% and 57% respectively. The maximum indicators of degradation of the river network in the Tihaya Sosna basin for the period from the 1780-s by the 1880-s were observed. In the basin of the river Vorskla, the degradation of the river network in the periods under review had a uniform character. Mainly, degradation was focused to rivers of 3-5 hydrographic levels as a result of deforestation in the upper parts of their basins.