Original paper

Soil erosion and sediment supply to a fluvial system in the last-glacial area on the example of the upper Szeszupa river catchment (NE Poland)

Smolska, Ewa


The research aimed to assess soil erosion and sediment supply to the upper Szeszupa River in the valley gap near Udziejek village in NE Poland. Interrill erosion was monitored with a use of collectors installed according to the method of Gerlach (1976). Rill erosion and deposits were calculated based on volume measurements of erosional and depositional forms. The research aimed to assess the delivery of the slope material to the valley floor and the river channel. Suspended material was monitored in two hydrometric profiles on the Szeszupa river channel (above and below the experimental area). Annual interrill erosion of the arable slopes ranged from 24-550 kg ha−1 year−1. Deposition of eroded soil took place in the concave segments ranged from 35-525 kg ha−1 year−1 (up to 1000 kg ha−1 under vegetables). Only small part of the eroded soil was transferred beyond the foothills - concave segments played a role of a topographic barrier. The effectiveness of rill erosion was greater and amounted to 430-1600 kg ha−1 year−1. The next factor controlling deposition of the slope material was vegetation, particularly during heavy rainfall events. The material was accumulated in the flood plain at the foothills. Both barriers: topographic and vegetation strongly limited export of eroded soil, 80-100 % of total soil loss was kept at the foothills. The results show that sediment supply from slopes, rills formed along fields boundaries, and the dirt road constituted from 1 to 26 % of the river suspended load.


soil erosiondepositionsediment deliveryvegetation barrier