Abstract
An analysis is made of the formation factors and regime of floating river sediments on the territory of Bulgaria, considering the influence of the relief (land surface), climatic conditions such as rainfall intensity, snowmelt, wind effects, water erosion, afforestation (forest vegetation), the amount of river runoff, and anthropogenic activity. A period of 35 years (1951-1995) is covered, characterized by intensive hydrotechnical construction and industrialization in Bulgaria. The twofold impact on the quantity and quality of suspended sediments from anthropogenic activity has been revealed. It is difficult to find reliable data for an accurate quantitative assessment, but the general conclusion the research conducted is that there has been a noticeable tendency to decrease the amount of suspended sediment in most rivers in the country in recent decades.
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