ANALYSIS OF THE PROCESSES AND TRANSFORMATIONS OF THE DENUNDATION VALLEYS IN THE BIELSK PLAIN
 
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Katedra Ochrony i Kształtowania Środowiska, Politechnika Białostocka, ul. Wiejska 45A 15-351 Białystok
Publication date: 2015-07-25
 
Inż. Ekolog. 2015; 43:80–87
 
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ABSTRACT
The aim of the study was to recognise natural and anthropogenic transformations taking place in small denudation valleys in the old glacial landscape of the Bielsk Plain. The changes are registered in sediments of the valleys. The Bielsk Plain area situated in the north of Bielsk Podlaski is characterized by the presence of latitudinal running denudation valleys, that end with concave broadenings in their headwaters. The geological structure is dominated by silt deposits of various origins. Tills are present in the hilltops while organic and organo-mineral deposits in the depressions. The thickness of the deluvial deposits in the valleys reaches 2 m though usually it does not exceed 1 m. The deposits are mostly silts that developed lithologically as sandy dust and loam dust. Colluvium sedimentation in the valleys clearly correlates with the development of agriculture, deforestation and farming in the area. The abandonment of the cultivation causes significant slowdown in the pace of accumulation of colluvium sediments.