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EVALUATION OF THE IMPACT OF STREAM FLOW ON THE MOUNTAIN RIVER ECOSYSTEM USING THE IFIM METHODOLOGY
Abstract
This paper describes the IFIM method (Instream Flow Incremental Methodology) for determining the minimum discharge, which, in addition to hydrological parameters, takes hydraulic, morphological and ichthyic parameters into account as well. The basic principle of the method is the relationship between the fish population and its habitat, i.e. that most of the fish species prefer certain combinations of depths, stream velocities and bed materials. If the values for a species living in the section of the river investigated are known, the minimum discharge for each fish species may be determined. This method was verified on reference sections of the Nitra River - the largest tributary of the river Vah. The paper gives the basic results from the section of the Nitra River in which the research was conducted. River restoration measures should fulfil the needs to create conditions similar to a natural stream. It is necessary to point out that the stream depth variability cannot be directly implemented into regulated channel. he measurements made in the reference sections of the Nitra River demonstrated that the relation between the fish population and characteristics of the habitat gives a true picture of the changes induced by the topography of the riverbed (for instance by river regulations) and by the discharge. The main advantage of the IFIM method is that it quantifies biological changes in the river as a function of the weighted usable area and discharge through fish, which are bioindicators of the environmental quality.
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References15
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