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Charakterystyka sieci rzecznej małej zlewni położonej w strefie krawędziowej Wyżyny Łódzkiej

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Characterization of the small drainage basin river network located in the Łódź Upland margin zone
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The hydrographical network is a phenomenon under constant time and space changes.
These ch_anges have seasonal and multi-annual character. The dynamics of this phenomenon
needs estimation not only of the network itself but also of the water moving in it. This
problem becomes particularly important in the case of the areas located near urban grounds
which are under intense anthropopression. It is possible then to conclude of progressive
influence of human activities after recognizing of the natural factors forming hydrographical
The Dzierżązna drainage basin was explored up to the Swoboda closing profile (42,9 km2).
It is located in the northern Łódź Upland part and is drained by the Moszczenica river
system (fig. l). The southern boundary of the basin is determined by the urban Zgierz
suburbs. Exactly this place in Malinka, there are springs of Dzierżązna river. Hydrographical
network explorations were carried out basing on the topographic map in the scale 1:25 000.
Thus the obtained data were updated and verified in the field in July 1998.
Analysis of the river network parameters was carried out in the capacity of a drainage
density (Wilgat's and Neumann's method) and a degree of an orderly arrangement (verification
of the Horton's theory after the Strahler's classification) - fig. 2, 4, tab. l, 2. The authors
also made detailed estimation of each stream: a river long fall, sinuosity and development
(fig. 3, tab. l).
Estimation also concerns time in which water running the channels reaches the closing
profile and concerns the discharge rate as well. Their space layout is represented on the maps
- fig. 5, 6. In the final stage of the study the authors tried to evaluate the running water
resources basing on the resources momentum measure. Thanks to using the mentioned above
procedure it was possible to take account the dynamics of the resource processes, because
physical unit of the presented measure is (m^4 x S^-l) They also estimated degree of concentration
of the resources in the river system (fig. 7, 8).
Artykuł zawiera charakterystykę sieci hydrograficznej zlewni Dzierżąznej - po wodowskaz
w Swobodzie. Ocenie poddano parametry sieci, czas dobiegu wody korytami do profilu
zamykającego, jak również wielkości przepływów. Określono także zasoby wód płynących i ich
koncentrację na podstawie miary pędu zasobów.
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