Seasonal and diurnal variation of downstream fish movement at four small‐scale hydropower plants

2019 ◽  
Vol 29 (1) ◽  
pp. 74-88 ◽  
Author(s):  
Josef Knott ◽  
Melanie Mueller ◽  
Joachim Pander ◽  
Juergen Geist
Keyword(s):  
Diurnal Variation ◽  
Small Scale ◽  
Fish Movement ◽  
Hydropower Plants ◽  
Seasonal And Diurnal Variation

scholarly journals The influence of water resources on transformation of spatial-functional structure of the territory of the municipality of Mali Zvornik and the possibilities for the construction of new hydro power plants

2010 ◽  
Vol 90 (3) ◽  
pp. 189-206 ◽  
Author(s):  
Mila Pavlovic ◽  
Rajko Golic ◽  
Dejan Sabic
Keyword(s):  
Water Resources ◽  
Power Plants ◽  
Hydraulic Engineering ◽  
Functional Structure ◽  
Hydropower Plant ◽  
Small Scale ◽  
Hydro Power ◽  
Hydropower Plants ◽  
Economic Revitalization ◽  
Hydro Power Plants

The territory of the municipality of Mali Zvornik is, from the aspect of morphology and spatial-functional structure, a heterogeneous area. It is located in the valley of the Drina River and in hilly-mountainous part of Podrinjske mountains. The area of the municipality is 184 km?, with 14076 inhabitants (2002). The importance of water resources for the development of the municipality, particularly of the hydropower plant (HPP) ?Zvornik?, is analyzed in this paper. Inadequate use of hydro-energetic potential, possibilities for construction of new hydropower plants and economic reasons for their construction are also emphasized. The priorities of the development of hydraulic engineering are defined in relation to morphological and hydrological conditions. They refer to increase of power of the HPP ?Zvornik? and construction of small-scale hydropower plants in hilly-mountainous part of municipality. Considering depopulation processes in the villages of Mali Zvornik, hydraulic engineering, together with agriculture, forestry, exploitation of mineral goods and tourism, can be one of the factors of demographic and economic revitalization of this area.

Numerical Characterization of the Performance Curve of a Regenerative Pump-as-Turbine

2021 ◽  
Author(s):  
Giulio Cantini ◽  
Simone Salvadori
Keyword(s):  
Helical Structure ◽  
Operating Mode ◽  
Numerical Approach ◽  
Pollutant Emissions ◽  
Small Scale ◽  
Centrifugal Pumps ◽  
Green Technologies ◽  
Small Hydropower ◽  
Hydropower Plants ◽  
Working Region

Abstract Energy companies in the power generation field are continuously searching for green technologies to reduce pollutant emissions. In that context, small hydropower plants represent an attractive solution for distributed electricity generation. Reverse-running centrifugal pumps (also known as "pump-as-turbines", PaT) are increasingly selected in that field. Amongst the existing type of pumps, drag-type regenerative pumps (RP) can perform similarly to radial centrifugal pumps in terms of head and efficiency for low specific speed values. For a fixed rotational speed, RPs with linear blades work as pump or turbine only depending on the flow rate. Such peculiarity makes it particularly intriguing to evaluate RPs working characteristic in the turbine operating mode. In the present paper, the performance of three Regenerative Pump-as-Turbines (RPaT) are analyzed using Computational Fluid Dynamics (CFD). The numerical approach is validated using experimental data for both an RP (in the pump working region) and a regenerative turbine (RT) (in the turbine working region). Finally, the numerical simulation of a small-scale RP allows for characterizing both the pump and the turbine regions. Results shows that for a RPaT it is possible to find a "switch region" where the machine turns from behaving as a pump to behaving as a turbine, the losses not being overcome by the turbine power output. The analysis of the RPaT also shows the inversion of the flow pattern and the constant positioning of the pivot around which the flow creates the typical helical structure that characterizes RPs.

scholarly journals Heart rate sensor validation and seasonal and diurnal variation of body temperature and heart rate in domestic sheep

2019 ◽  
Vol 8 ◽  
pp. 100075 ◽  
Author(s):  
Boris Fuchs ◽  
Kristin Marie Sørheim ◽  
Matteo Chincarini ◽  
Emma Brunberg ◽  
Solveig Marie Stubsjøen ◽  
...  
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Diurnal Variation ◽  
Domestic Sheep ◽  
Sensor Validation ◽  
Seasonal And Diurnal Variation ◽  
Rate Sensor

scholarly journals Habitat Use by Pseudochondrostoma duriense and Squalius carolitertii Downstream of a Small-Scale Hydropower Plant

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2522
Author(s):  
Isabel Boavida ◽  
Filipa Ambrósio ◽  
Maria João Costa ◽  
Ana Quaresma ◽  
Maria Manuela Portela ◽  
...  
Keyword(s):  
Habitat Use ◽  
Fish Species ◽  
Hydropower Plant ◽  
Mitigation Measures ◽  
Small Scale ◽  
The North ◽  
Reduce Energy Expenditure ◽  
Hydropower Plants ◽  
River Reach ◽  
Flowing Waters

Downstream of small-scale hydropower plants (SHPs), the intensity, frequency and persistence of hydropeaking events often cause an intolerable stress on fish of all life stages. Rapid increases in flow velocity result in fish avoiding unstable habitats and seeking refuge to reduce energy expenditure. To understand fish movements and the habitat use of native Iberian cyprinids in a high-gradient peaking river, 77 individuals were PIT tagged downstream of Bragado SHP in the North of Portugal. Tagged fish species included Pseudochondrostoma duriense and Squalius carolitertii. Fish positions were recorded manually on two different occasions: during hydropeaking events (HP) and without hydropeaking events (NHP). From the 77 tagged fish, we were able to record habitat use for 33 individuals (20 P. duriense and 13 S. carolitertii) in a total of 125 relocations. Fish species were distributed along the river reach with high density in the upstream area in the vicinity of the SHP tailrace, in particular during HP. Fish locations were associated with velocity for P. duriense and S. carolitertii. The latter tended to use faster flowing waters than P. duriense. Our findings on the habitat use in peaking rivers are a valuable tool to help in the selection and design of mitigation measures.

scholarly journals The Small-Scale Hydropower Plants in Sites of Environmental Value: An Italian Case Study

2017 ◽  
Vol 9 (12) ◽  
pp. 2211 ◽  
Author(s):  
Marianna Rotilio ◽  
Chiara Marchionni ◽  
Pierluigi De Berardinis
Keyword(s):  
Small Scale ◽  
Italian Case ◽  
Environmental Value ◽  
Hydropower Plants

Seasonal and diurnal variation in concentrations of gaseous and particulate phase endosulfan

2012 ◽  
Vol 61 ◽  
pp. 620-626 ◽  
Author(s):  
Qingbo Li ◽  
Xianyu Wang ◽  
Jing Song ◽  
Hongqi Sui ◽  
Lei Huang ◽  
...  
Keyword(s):  
Diurnal Variation ◽  
Particulate Phase ◽  
Seasonal And Diurnal Variation
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