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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): Šikšnys, Arvydas;Ždankus, Narimantas Titas;Sabas, Gintautas
Title: Numerical and field investigations of unsteady river flow downstream hydropower plant (HPP)
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. 165
Date: 2012
ISBN: 9789514298943
Abstract: Sudden and often fluctuations of water discharges and levels in the downstream reach of the hydropower plant make water fauna and flora existence conditions unbearable. Besides, river bed here is subjected to long lasting and intensive scour and deformations. The aim of our investigations is to develop measures improving the water flow regime in the downstream reach of the HPP. The Nemunas River and Kaunas HPP. were selected as basis for our numerical and field investigations. To initiate positive changes of river flow regime, current regime was investigated first of all. Actual flow regime below the HPP was observed and analysed on the ground of long lasting dynamic measurement data. Numerical treatment of field measurement data and flow simulation works were arranged and carried out simultaneously. Numerical hydrodynamic model MIKE-21 enabled us to evaluate existing river flow conditions and to apply the model for simulation of many different turbine regimes and to select the optimal one. The content of our research was as follows: 1) analysis of typical turbines regimes while switching them on and off and flow regimes downstream; 2) continuous long lasting measurement of water level in many cross-sections of the river under investigation downstream the HPP; 3) numerical simulation and investigation of untypical turbines regimes while switching them on and off and flow regimes downstream with application software MIKE-21 in the same unsteady flow conditions in which field measurements were made. Calibration of numerical model was performed and slight corrections were introduced into the model. Obtained data on water level and flow rate dynamics downstream the Kaunas HPP have been analysed and optimal turbine operation regimes were determined. Numerical two dimension model MIKE-21 was prepared and calibrated for the same unsteady flow conditions. Analysis of possible errors was performed and reliability of the results was verified
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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