Abstract
Abstract The article summarises the results of observations conducted in the periods 1989-1992, 1998-2000, and 2001- 2003 in the catchment of the Roztocze section of the Wieprz River with an area of 404 km2. The presented results of the study on fluvial transport document the response of an upland river to variable hydro-climatic conditions. Fluvial transport rate in periods extreme in hydrological terms was compared. In the conditions of low water stages (1989- 1992) and mean annual discharges lower than the mean multiannual by 19%, the Wieprz River discharged an average of 13300 tonnes of solutions and 485 tonnes of suspensions annually. The unitary indices amounted to 32.7 and 1.2 t/ km2/year, respectively. In the years 1998-2000, in the conditions of high water stages and mean annual discharges higher than the multiannual by 41%, the Wieprz River discharged approximately 22,800 tonnes of solutions and 981 tonnes of suspensions annually. The unitary indices increased proportionately to 56.2 t/km2/year and 2.4 t/km2/year, respectively. In the years 2001-2003, in the conditions of variable water stages and discharges higher than the multiannual by 12%, the Wieprz River discharged an average of approximately 17,500 tonnes of solutions and 441 tonnes of suspensions annually. The unitary indices reached the values of 43.3 t/km2/year and 1.1 t/km2/year, respectively.
Highlights
Water and matter circulation, distinguished by high temporal variability and considerable spatial variability, determines the modern development of the natural environment of the temperate climate zone
In the conditions of low water stages (1989– 1992) and mean annual discharges lower than the mean multiannual by 19%, the Wieprz River discharged an average of 13300 tonnes of solutions and 485 tonnes of suspensions annually
The Roztocze part of the Wieprz River catchment constitutes an important part in the water management system of the entire catchment
Summary
Water and matter circulation, distinguished by high temporal variability and considerable spatial variability, determines the modern development of the natural environment of the temperate climate zone. The area of the catchment above Zwierzyniec, constituting 3.9% of the area of the Wieprz River catchment, provides 6% of fluvial discharge It is distinguished by the low level of environment degradation, expressed in a low value of the complex pollution coefficient (Świeca 1998, Świeca, Kociuba 2007). In such conditions, the type and amount of transported river load can reflect the current geomorphological processes (Gregory, Walling 1973). The objective of the study was to present the spatial variability of the dynamics of fluvial processes in the Roztocze part of the Wieprz River catchment, as well as the relations between the quantitative indices of fluvial transport and hydro-climatic and geological conditions
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