scholarly journals Lost Energy of Water Spilled over Hydropower Dams

2021 ◽  
Vol 13 (16) ◽  
pp. 9119
Author(s):  
Andrej Predin ◽  
Matej Fike ◽  
Marko Pezdevšek ◽  
Gorazd Hren
Keyword(s):  
Power Plants ◽  
Flood Events ◽  
Energy Potential ◽  
Climate Conditions ◽  
Hydropower Plants ◽  
Hydropower Dams ◽  
Sava River ◽  
Analytical Assessment ◽  
The Sava River

The present paper presents a view of water spilled over hydropower plants as an energy loss. In the current climate conditions, flood events are becoming more frequent due to human impact on the environment; water spills are also more frequent, which means more and more energy is lost. How much water is spilled and, consequently, how much energy is lost is shown in the present article on the chain of power plants on the Sava River in the five years from 2015 to 2019. An analytical assessment of the current situation in the lock was carried out, which showed that the available water through the locks could be used efficiently. The paper presents a case study of one overflow event lasting 48 h. The calculated theoretical losses of energy (of spilled water) and possible technical implementation for capturing losses are given. The proposed technical implementation is based on established technology, so we could expect that the approach is feasible. The results show that the estimated spilled water energy potential reaches about 40% of the actual spilled water or energy lost.

scholarly journals Contribution to the knowledge on the distribution of freshwater sponges – the Danube and Sava rivers case study

2017 ◽  
Vol 77 (2) ◽  
Author(s):  
Stefan Andjus ◽  
Nadja Nikolic ◽  
Valerija Dobricic ◽  
Ana Marjanovic ◽  
Zoran Gacic ◽  
...  
Keyword(s):  
Danube River ◽  
Sequencing Analysis ◽  
Freshwater Sponges ◽  
The Danube River ◽  
Rdna Sequencing ◽  
Freshwater Invertebrate ◽  
Sava River ◽  
Ephydatia Fluviatilis ◽  
The Sava River

Sponges in the large rivers within the Danube River Basin (DRB) have not been adequately studied. Hence, the aim of this work was to undertake an investigation on the distribution of sponge species in the Danube and Sava rivers. Out of 88 localities covered by the study, sponges were found at 25 sites only (46 samples in total). By using morphological (light and scanning electron microscopy) and genetic (28S rDNA sequencing) analysis, four species were determined: Ephydatia fluviatilis (Linnaeus, 1759), Spongilla lacustris (Linnaeus, 1759), Eunapius fragilis (Leidy, 1851), Trochospongilla horrida Weltner, 1893. In the Danube, the predominant species was found to be E. fluviatilis making approximately 80% of collected samples, while in the Sava River S. lacustris dominated, representing 46% of the river sponges. Our work represents one of the few studies on freshwater sponges within the DRB from long stretches of the large lowland rivers (more than 2500 km of the Danube River and about 900 km of the Sava River). Moreover, molecular analysis for the identification of freshwater sponges was applied on the material collected from a wide area, thus contributing to the systematic studies on the distribution and abundance of the European freshwater invertebrate fauna in general.

scholarly journals Evaluation of the possibilities of using water-damming devices on the Tyśmienica River to build small hydropower plants

2017 ◽  
Vol 35 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Alina Kowalczyk-Juśko ◽  
Andrzej Mazur ◽  
Antoni Grzywna ◽  
Agnieszka Listosz ◽  
Roman Rybicki ◽  
...  
Keyword(s):  
Power Plants ◽  
Renewable Energy Sources ◽  
Natura 2000 ◽  
Legal Framework ◽  
Point Of View ◽  
Hydroelectric Power ◽  
Energy Potential ◽  
Small Hydropower ◽  
Hydropower Plants ◽  
Technical Capacity

AbstractHydropower plants in Poland currently use only 19% of the river’s energy potential. Development of hydropower is limited by environmental regulations as well as by economic grounds. From the environmental point of view, it is desirable to build small hydropower plants integrated into the local landscape. This paper presents results of the research aimed at estimating the amount of energy that could be produced in the case of small hydroelectric power plants on weirs existing on the Tyśmienica River. There is also a legal framework that should be adapted at hydropower development. It was calculated that the technical capacity of the small hydropower plants that could be built on 4 existing weirs, is 0.131 MW. These power plants could produce 786 MWh of electricity per year. The economic efficiency of this production is currently difficult to assess, because a new support system for renewable energy sources is currently being implemented, which will be a decisive factor for entrepreneurs. It should be borne in mind that potential investments will be made in protected areas within the Natura 2000 network, which may limit their constructing or impose the obligation to assess their impact on selected environmental elements. Location within the protective area does not eliminate such investments, especially when solutions with the least possible environmental impact are used.

scholarly journals Dynamics of Common Sterna hirundo and Little Tern Sternula albifrons populations along the Sava River in North-western Croatia between 2002 and 2019

Acrocephalus ◽  
2019 ◽  
Vol 40 (180-181) ◽  
pp. 49-54
Author(s):  
Jelena Kralj ◽  
Miloš Martinović ◽  
Tomica Rubinić ◽  
Davor Krnjeta ◽  
Luka Jurinović
Keyword(s):  
Natura 2000 ◽  
Common Tern ◽  
Sterna Hirundo ◽  
River Islands ◽  
Hydropower Plants ◽  
Sava River ◽  
Population Sizes ◽  
Natura 2000 Site ◽  
Natural Dynamics ◽  
The Sava River

AbstractBetween 2002 and 2019, monitoring of Common Tern Sterna hirundo and Little Tern Sternula albifrons along the Sava River near Zagreb, Croatia was conducted. Natura 2000 site “Sava kod Hrušćice” was designated to protect colony at river islands, with estimated population sizes of 100–150 pairs of Common and 20 pairs of the Little Tern. Flooding of the colony caused breeding failure in several years. Common Terns moved to breed on islands in gravel pits with a total population around 150 pairs, while Little Tern did not breed after 2010. In the last few years, terns have not bred at Hrušćica and the only colony inside the Natura 2000 site is situated on a breeding platform at Siromaja gravel pit. Channelling of rivers and hydropower plants are the main threats, changing natural dynamics of water level and causing reduction of gravel sediment in rivers.

scholarly journals Epilithic Diatom Community Shows a Higher Vulnerability of the River Sava to Pollution during the Winter

Diversity ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 465
Author(s):  
Igor Zelnik ◽  
Tjaša Sušin
Keyword(s):  
Power Plants ◽  
Abiotic Factors ◽  
Sampling Site ◽  
Hydroelectric Power ◽  
Diatom Community ◽  
Nitrogen And Phosphorus ◽  
Sava River ◽  
Diatom Communities ◽  
Epilithic Diatom ◽  
The Sava River

The aim of the research was to investigate the influence of environmental factors on the structure of epilithic diatom communities in the Sava River from the source to the state border 220 km downstream. The river had numerous human influences along its course, such as municipal and industrial wastewater, agriculture, hydroelectric power plants, etc. The main objective of the research was to find out the influence of human pressure on the structure of the epilithic diatom community under winter and summer conditions. Winter and summer samples were taken at nine sites. At each sampling site, a set of abiotic factors was measured and another set of environmental parameters was evaluated. The analyses showed that nitrogen and phosphorus concentrations increased downstream. We identified 118 different species of diatoms. The most common taxa were Achnanthidium minutissimum and A. pyrenaicum. Planktonic species Cyclotella meneghiniana was only found in the samples of the lower part of the Sava, which is unusual for the epilithic community. The composition of the epilithic diatom community was significantly influenced by conductivity and water temperature, pH and distance from the source. The similarity between diatom communities closer to the source of the river was higher than between communities from the lower part of the Sava River. The values of the trophic and saprobic indices increased downstream and showed that the pollution of the river with nutrients and organic matter increases with the distance from the source. Both indices were significantly higher in winter and showed a more impaired river ecosystem during the winter.

scholarly journals Performance Evaluation of Runoff River Type Hydropower Plants Operating in Nepal: A Case Study of Nepal Electricity Authority

2014 ◽  
Vol 10 (1) ◽  
pp. 104-120
Author(s):  
Sandeep Joshi ◽  
Rajendra Shrestha
Keyword(s):  
Performance Evaluation ◽  
Power Plant ◽  
Decision Maker ◽  
Power Plants ◽  
Hydropower Plant ◽  
Operation And Maintenance ◽  
Hydropower Plants ◽  
Maintenance Practice ◽  
River Type

Every power plant undergoes repair and maintenance which reduces the performance of the power plants as their condition undergoes periodic deterioration. To rectify the situation of aging and deterioration, timely evaluation of existing power plants is a must. Such that the evaluation will enable the decision maker to make decision regarding the present operation and maintenance practice: the need for modification of the practice or need to undergo rehabilitation in order to operate existing plants in a more efficient and effective way. Performance evaluation of a hydropower plant is performed .on the basis of various performance indicators.DOI: http://dx.doi.org/10.3126/jie.v10i1.10886Journal of the Institute of Engineering, Vol. 10, No. 1, 2014 pp. 104–120

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