Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Sojka, Mariusz

doi:10.3390/en15020439

Cited by 12 publications

(5 citation statements)

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“…Such assumptions are important in the case of many regions in Poland (also covering catchments where river temperature monitoring has been discontinued), where substantial water deficits are recorded. A smaller amount of water resources increases the risk of their faster degradation [40], and precise data regarding water temperature, determining, among other things, dissolved oxygen concentration [60], provide the basis for undertaking appropriate reclamation activities.…”

Section: Discussionmentioning

confidence: 99%

“…In order to remove the autocorrelation from the data series, a trend-free prewhitening procedure was used [39]. The adopted procedure is the most frequently used when analysing hydrological data [40,41]. This is because the method based on the Mann-Kendall and Sen test is less sensitive to extreme values compared to the linear regression method and Student's t-test.…”

Section: Procedures For Testing and Validation Of Multiple Linear Reg...mentioning

confidence: 99%

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Possibilities of River Water Temperature Reconstruction Using Statistical Models in the Context of Long-Term Thermal Regime Changes Assessment

Sojka

Ptak

2022

Applied Sciences

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Water temperature in rivers is the key property determining the biotic and abiotic processes occurring in these ecosystems. In many regions of the world, the significant lack of measurement data is a serious problem. This paper presents reconstruction of water temperature for selected Polish rivers with monitoring discontinued in the period 2015–2020. Information regarding air temperature and water temperature in lakes provided the basis for the comparison of three models: multiple linear regression, random forest regression, and multilayer perceptron network. The results show that the best reconstruction results were obtained with a multilayer perceptron network model based on water temperatures in the lake and air temperatures from three meteorological stations. The average values of mean error, root mean square error and standard error were for the rivers in Poland: 1.52 °C, 5.03%, and 0.47 °C. The course of mean yearly water temperature in the years 1987–2020 showed a statistically significant increase from 0.18 to 0.49 °C per decade. The results show that the largest increases occurred in June, August, September, November, and December.

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Section: Discussionmentioning

confidence: 99%

Section: Procedures For Testing and Validation Of Multiple Linear Reg...mentioning

confidence: 99%

Possibilities of River Water Temperature Reconstruction Using Statistical Models in the Context of Long-Term Thermal Regime Changes Assessment

Sojka

Ptak

2022

Applied Sciences

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“…Moreover, in order to demonstrate changes of water flows in relation to changes of climatic conditions, trend analysis for air temperatures and precipitation was performed in a similar way. The applied tests belong to the group of non-parametric tests usually used in analyses of hydrological and climatic data [30]. The analysis employed the modified package developed by Patakamuri and O'Brien [31].…”

Section: Methodsmentioning

confidence: 99%

Influence of the Jeziorsko Dam Reservoir on Water Flow in the Warta River

et al. 2022

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The progressing development of civilisation and climate change require access to an appropriate quantity of environmental resources. One of the key resources is water. Both its deficit and excess evidently affect human life. Control over water circulation is possible owing to water management, largely involving introduction of hydraulic structures. The paper analyses the effect of the Jeziorsko dam reservoir on the flows of the Warta River, the third largest river in Poland. It analyses water flows in the Warta River in the years 1993–2020 for hydrological stations above and below the reservoir. The conducted research showed that the construction of the Jeziorsko reservoir also substantially contributed to an increase in minimum flows and a decrease in maximum flows. Moreover, the simulation showed that in the case of abscence of the reservoir, the flows of the Warta River would be higher in the period from January to June, and in the period from July to October the opposite situation would occur. In November and December, the flows would be at a similar level. Results obtained in the study, show that hydraulic structures are an effective solution in the context of stabilisation of the hydrological situation in a given region, particularly in terms of hydrological lows occurring with increasing intensity mitigated on sections of rivers below the reservoirs.

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“…M. Sojka points out that an important determinant of safe and efficient hydropower plants is to ensure the compliance of the installation with the applicable regulations and proper planning [116]. The above aspects are indicated as serious barriers to the development of hydropower, as the time for planning the investment and obtaining the relevant permits is relatively long (1-4 years), which is compounded by the very significant cost of project implementation, which is-generally higher compared to the cost of construction and commissioning of conventional power plants, reaching up to several tens of millions of PLN [47].…”

Section: Advantages and Disadvantages Of Hydropower According To The ...mentioning

confidence: 99%

Hydropower in the Energy Market in Poland and the Baltic States in the Light of the Challenges of Sustainable Development-An Overview of the Current State and Development Potential

et al. 2022

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The energy crisis is affecting a number of countries, but particularly those that are heavily dependent on the traditional energy generation formula (e.g., Poland), as well as those neighbouring the territory of the ongoing war in Ukraine, i.e., Poland, Lithuania, Latvia and Estonia. With this in mind, the authors of this study decided to explore the issue of water energy as a source of green (cheap and environmentally safe) energy in these countries. The main objective of the paper is to review the available literature, which is needed to identify the role hydropower plays in energy security and energy transition in these energy markets. This paper is based on a review and critical appraisal of the available literature and studies together with an inference. The structure of the paper consists of an introduction, the main part of the review and conclusions. The geopolitical location and socio-economic conditions of the adopted set of countries, form the basis of the review of the existing literature on the theme explored and the substantive inference. The main findings of this review indicate that the literature is most strongly focused on the overall assessment of the energy transition of the adopted countries for review, where the hydropower thread is most often taken up as one source of renewable energy supply. Hydropower, due to its relatively low share in the energy systems of the adopted set of countries, is, according to the authors, insufficiently explored. The most significant gap relates to the aspect of the potential for hydropower development in these areas, considering both the construction of new hydropower plants and opportunities signalled in the literature for the modernisation or restoration of existing ones. In this respect, the need for analyses (studies and simulations) of hydropower development, considering the economic benefits associated with their development juxtaposed with the safety dimension of this course of action for the environment (analysis and assessment of environmental costs) is indicated, which is the main recommendation of the review.

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Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Cited by 12 publications

References 64 publications

Possibilities of River Water Temperature Reconstruction Using Statistical Models in the Context of Long-Term Thermal Regime Changes Assessment

Possibilities of River Water Temperature Reconstruction Using Statistical Models in the Context of Long-Term Thermal Regime Changes Assessment

Influence of the Jeziorsko Dam Reservoir on Water Flow in the Warta River

Hydropower in the Energy Market in Poland and the Baltic States in the Light of the Challenges of Sustainable Development-An Overview of the Current State and Development Potential

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