Dynamika transportu fluwialnego górnej Parsêty jako odbicie funkcjonowania systemu zlewni

Dynamics of fluvial transport of the upper Parsêta River as a response of the catchment system

Andrzej Kostrzewski, Malgorzata Mazurek, Zbigniew Zwoliñski

11. Geomorphic role of fluvial transport in the upper ParsÍta - final conclusion

Fluvial transport is one of the basic processes of a contemporary denudation system of the temperate zone and is a good indicator of the operation of a catchment system. A detailed knowledge of its character and variability in a yearly cycle is fundamental for a quantitative and qualitative description of modern fluvial systems. The concepts used in research, Cholley's denudation system and Bertallanffy's functioning of a system, proved very useful in determining the internal structure of the system of the upper ParsÍta catchment, and especially in establishing relationships that hold among the studied elements of the system. The initial assumption that the kind and amount of material flowing through the profile closing the catchment reflects current geomorphological processes in the catchment and the river channel, was corroborated by a specially designed measurement system and detailed studies.

Denudation processes in the upper ParsÍta catchment are continuous and highly seasonal in character, with variable rates of chemical and mechanical denudation in the successive seasons of denudation activity distinguished. The result is the variability of the upper ParsÍta regime reflected in variations in the ionic flow and suspension flow. The alternating intensity of denudation processes in the river catchment system should be recognised as a morphogenetic regularity in the temperate zone. The data presented in this book document the dominance of processes of chemical denudation over those of mechanical denudation.

The period of a heightened morphogenetic activity in the upper ParsÍta catchment in the hydrological years 1992 and 1993 embraced the cycle of thaws and spring and summer floods, i.e. the period of a heightened denudation activity. The high efficiency of denudation processes is associated with weather types and influences the dynamics of the river regime. Thus, knowledge of the distribution of the hydrochemical and fluvial transport groups over the year allows an assessment of morphogenetic activity in the present-day denudation system of the catchment. A temporal analysis of the distinguished hydrochemical and fluvial seasons, and on their basis of the seasons of denudation activity, leads to the conclusion that the evolution of the denudation system of the upper ParsÍta catchment is a continuous process with periods of reduced, average and heightened denudation activity, dependent on the weather rhythm of the temperate zone.

The quantitative and qualitative characteristics of the variation in the river transport of the upper ParsÍta obtained in the research procedure made it possible to define the mechanism underlying the functioning of the geoecosystem of this part of the catchment. The results also describe the basic regularities of a present-day denudation system of the West Pomeranian young-glacial area situated in the temperate climatic zone.

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