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Type of publication: conference paper
Type of publication (PDB): Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Vaikasas, Saulius;Pliūraitė, Virginija;Bastienė, Nijolė
Title: Impact of small hydropower plant on biotic environment
Is part of: Nordic water 2012 : catchment restoration and water protection : XXVII Nordic hydrological conference : abstracts / editors : Ritta Kamula, Bjorn Kløve, Hanna Arola. Oulu, 2012
Extent: p. 184
Date: 2012
ISBN: 9789514298943
Abstract: Segmentation of river channels into dammed and undammed reaches results in the changes in integrity of free-flow conditions and greatly disturbs the hydrological regime, coherent with both transport and retention of suspended sediments ant nutrients. The impact of a small hydropower plant (HPP) on the environment, particularly in downstream reaches was investigated in four Lithuanian rivers and involved 17 dams. The height of the dams and the capacities of their reservoirs ranged from 2.25 to 14.50 m and from 28xl03 to 15.500xl03 m3 respectively. To determine the concentrations of suspended solids (SS), total nitrogen (TN), and total phosphorus (TP), water and ground samples were taken about 50 m from each dam, both upstream (reservoir) and downstream (river). Benthic macroinvertebrates and a range of environmental variables were sampled at 3 study sections of each dam: control point, HPP reservoir and below HPP dam. The impact on biotic environment quality was also estimated by the ecohydraulic parameters - Froude Numbers (Fr) and Hilsenhoff biotic indexes (HBI). It was established that construction of HPP dams substantially changed natural regimes of SS and spread of invertebrates and also had negative influence on the abundance and taxonomic composition of macrozoobenthos. All the reservoirs had been trapped most SS including the finest one. As a result, the percentage of the particles with diameters <0.01 mm in the reservoir bed substrates increased about threefold in proportion to that in the river bed ones. The direct correlation with the coefficients ranging from 0.35 to 0.94 was established between the reservoir capacities and the deposited amounts of these particles. Flood water delay in the reservoir determined reduced concentrations of SS. The TN and TP concentrations decreased by about 11-13% only when the water was delayed in the pond cascades
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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