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Hydropower is oldest available source for renewable energy generation in Lithuania and the world. However, because of unequal demand of electricity during the day large hydropower plants are adapted to work in hydropeaking regime, which causes rapid water level and discharge fluctuations and has impact on the environment. To assess the extent of this impact in this study 2D numerical hydrodynamic modelling was carried out to reveal the dewatered or flooded stream channel areas at the Nemunas River downstream Kaunas Hydropower Plant. Such estimation of dewatered or flooded areas, considering different operating modes of hydropower plant, was carried out for the first time in Lithuania. It was revealed that largest areas are flooded when Kaunas hydropower plant starts its operation with two and four turbines and accordingly are dewatered when the plant stops such operations. During this study the impact of water level and discharge fluctuations on river ecosystems was not analysed, however the obtained results will be the initial data for more detailed assessment of fish habitats quality under impact of hydropeaking.
Linas Šilinis; Egidijus Kasiulis; Petras Punys. 2D HYDRODYNAMIC MODELLING FOR IDENTIFICATION OF DEWATERED OR FLOODED STREAM CHANNEL AREAS DOWNSTREAM LARGE HYDROPOWER PLANT. Journal of Water Security 2019, 5, 1 .
AMA StyleLinas Šilinis, Egidijus Kasiulis, Petras Punys. 2D HYDRODYNAMIC MODELLING FOR IDENTIFICATION OF DEWATERED OR FLOODED STREAM CHANNEL AREAS DOWNSTREAM LARGE HYDROPOWER PLANT. Journal of Water Security. 2019; 5 ():1.
Chicago/Turabian StyleLinas Šilinis; Egidijus Kasiulis; Petras Punys. 2019. "2D HYDRODYNAMIC MODELLING FOR IDENTIFICATION OF DEWATERED OR FLOODED STREAM CHANNEL AREAS DOWNSTREAM LARGE HYDROPOWER PLANT." Journal of Water Security 5, no. : 1.
Petras Punys; Egidijus Kasiulis; Algis Kvaraciejus; Antanas Dumbrauskas; Gitana Vyčienė; Linas Šilinis. Impacts of the EU and national environmental legislation on tapping hydropower resources in Lithuania – A lowland country. Renewable and Sustainable Energy Reviews 2017, 80, 495 -504.
AMA StylePetras Punys, Egidijus Kasiulis, Algis Kvaraciejus, Antanas Dumbrauskas, Gitana Vyčienė, Linas Šilinis. Impacts of the EU and national environmental legislation on tapping hydropower resources in Lithuania – A lowland country. Renewable and Sustainable Energy Reviews. 2017; 80 ():495-504.
Chicago/Turabian StylePetras Punys; Egidijus Kasiulis; Algis Kvaraciejus; Antanas Dumbrauskas; Gitana Vyčienė; Linas Šilinis. 2017. "Impacts of the EU and national environmental legislation on tapping hydropower resources in Lithuania – A lowland country." Renewable and Sustainable Energy Reviews 80, no. : 495-504.
This article discusses the environmental issues facing small hydropower plants (SHPs) operating in temperate lowland rivers of Lithuania. The research subjects are two medium head reservoir type hydro schemes considered within a context of the global fleet of SHPs in the country. This research considers general abiotic indicators (flow, level, water retention time in the reservoirs) of the stream that may affect the aquatic systems. The main idea was to test whether the hydrologic regime has been altered by small hydropower dams. The analysis of changes in abiotic indicators is a complex process, including both pre- and post-reservoir construction and post commissioning of the SHPs under operation. Downstream hydrograph (flow and stage) ramping is also an issue for operating SHPs that can result in temporary rapid changes in flow and consequently negatively impact aquatic resources. This ramping has been quantitatively evaluated. To avoid the risk of excessive flow ramping, the types of turbines available were evaluated and the most suitable types for the natural river flow regime were identified. The results of this study are to allow for new hydro schemes or upgrades to use water resources in a more sustainable way.
Petras Punys; Antanas Dumbrauskas; Egidijus Kasiulis; Gitana Vyciene; Linas Šilinis. Flow Regime Changes: From Impounding a Temperate Lowland River to Small Hydropower Operations. Energies 2015, 8, 7478 -7501.
AMA StylePetras Punys, Antanas Dumbrauskas, Egidijus Kasiulis, Gitana Vyciene, Linas Šilinis. Flow Regime Changes: From Impounding a Temperate Lowland River to Small Hydropower Operations. Energies. 2015; 8 (7):7478-7501.
Chicago/Turabian StylePetras Punys; Antanas Dumbrauskas; Egidijus Kasiulis; Gitana Vyciene; Linas Šilinis. 2015. "Flow Regime Changes: From Impounding a Temperate Lowland River to Small Hydropower Operations." Energies 8, no. 7: 7478-7501.