Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/84107
Type of publication: Straipsnis konferencijos medžiagoje Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or Scopus DB conference proceedings (P1a)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Vaikasas, Saulius;Palaima, Kęstutis;Sabas, Gintautas
Title: Hydraulic criteria and estimation of the hydropower plant (HPP) operation impact on the river environment
Is part of: Environmental engineering : the 8th international conference, May 19-20, 2011, Vilnius, Lihtuania: selected papers. Vol. 2 : Water engineering. Energy for buildings. Vilnius : Technika, 2011
Extent: p. 692-697
Date: 2011
Keywords: Hydraulics;Hydropower plant;Environment;Fr Number
ISBN: 9789955288275
9789955288282
Abstract: Interaction between a river and its environment is crucial, and negative impact of a HPP operation on the environment must be estimated. In order to be able to evaluate this impact, hydraulic parameters such as velocity, water depth, Froude Number (Fr) and fluctuation of flow regimes have been measured and hydro biological indices of water quality (HBI) have been calculated. Field experiment on the consequences of HPP turbines’ operation in the rivers Virvyte and the Susve has been performed in natural, directly and indirectly impacted regimes in 10 crosssections. To predict the influence of HPP, the meaning of Fr number criterion and the number of hydrophytes are compared. The results show that even small dams and reservoirs of HPP may impact the environmental change through facility operations over a sustained period, because in pounded reaches nearby/above HPP dams in the River Virvyte low Fr number in habitats (0.04>Fr> 0.0007) has been established. In the River Susve, below the Angiriai HPP, a serious disturbance of hydraulic parameters is determined when a positive wave front resulting from an increase of initial sanitary flow rate Qs =0.4m3 /s to total flow rate Qtot =10.4 m3 /s is moving downstream after the switching on the turbines. The maximal water level increase speed h / t( 0.18 m/min=10.8 m/h) is recorded on the second minute from start of the turbine. Consequently, it creates additional pressure of about 200kPa at the instant and can be a strong stressor for biological community of the river. Over 1 km long propagation of the surge without loosing much potential energy (because it is perpetual) is the main reason to avoid rapid operation of HPP turbines in practice
Internet: http://leidykla.vgtu.lt/conferences/Enviro2011/Articles/2/692-697_Vaikasas_other.pdf
http://leidykla.vgtu.lt/conferences/Enviro2011/Articles/2/692-697_Vaikasas_other.pdf
Affiliation(s): Vilniaus Gedimino technikos universitetas
Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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