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The Influence of the Selected Turbulence Model and Grid Density Degree on the Results of Velocity Distribution Obtained with the Use of the Simulation Program SSIIM

Hammerling M., Walczak N., Nieć J.

Journal of Ecological Engineering

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2018

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Vol. 19, nr 3

106--114

EN

This paper analyzed the water flow parameters in the local scour created after building stones sills No 3 km 480 + 902 and 4 km 479 + 225 below the Jeziorsko reservoir on the river Warta. The analysis was carried out using the result of field measurements (velocity distributions) and SSIIM (freeware) software. The study of the geometry of the local scour, were used to create a numerical model and implementing it to the SSIIM software. In the research, the impact of grid density on the obtained results was estimated. The results included the qualitative and quantitative assessment. The conducted analysis can be used to determine the movement of sediment in local scour, and can predict the development in time, and also specify the sill stability under different conditions of the water flow.

2

The Possibilities of Using Hec-Ras Software For Modelling Hydraulic Conditions of Water Flow in the Fish Pass Exampled by the Pomiłowo Barrage on The Wieprza River

Hammerling M., Walczak N., Walczak Z., Zawadzki P.

Journal of Ecological Engineering

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2016

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Vol. 17, nr 2

81--89

EN

The aim of the article is to analyse hydraulic conditions of water flow in a fish pass. The test facility is part of the Pomiłowo barrage in the commune of Sławno, Poland. The authors applied HEC-RAS software for modelling hydraulic parameters of the water flow in the fish pass. The data from field measurements was implemented in the software and calculations of changes in the water table in the fish pass were made. The results confirmed the usefulness of HEC-RAS software for estimating hydraulic parameters of water flow in a fish pass. HEC-RAS software enables to take into account the parameters responsible for the phenomena accompanying the flow through a fish pass. Selecting mathematical model parameters (coefficients) should be preceded by a multidimensional analysis of the facility. More precise information on hydraulics, hydrology and biology of the test fish pass are also required.

3

The Influence of the Presence of Vegetations in Floodplains on Flood Risks

Walczak N., Hammerling M., Spychała M., Nieć J.

Journal of Ecological Engineering

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2015

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Vol. 16, nr 5

160--167

EN

The movement of water on flood areas depends mainly on the geometric parameters of vegetation, which as a dynamic factor causes a high changeability of flow conditions during the year. The actual ecological trend, whereby there is a tendency to leave the plants in the floodplain, imposes the necessity on engineers to develop accurate methods of determining the effect of vegetation on what used to be once a commonly occurring flood risk. According to the report on national security risk, elaborated by the Government Security Centre, flooding is the most common such risk. This is most likely to occur among all the risks included in the National Crisis Management Plan and brings the greatest number of negative effects. In order to mitigate the negative phenomena related to floodplains, the methodology and calculation of the average flows, using the Maninng and Darcy-Weisbach models is presented.

4

Metodyka określania podstawowych parametrów MEW oraz analiza stosowanych umocnień na górnym i dolnym stanowisku

Walczak N., Hammerling M., Walczak Z.

Gospodarka Wodna

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2015

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Nr 5

140--146

PL

Budowa elektrowni wodnych na istniejących stopniach wodnych może nieść więcej korzyści niż potencjalnych szkód. Piętrzenie wody na górnym stanowisku może być wykorzystywane energetycznie bez negatywnego wpływu na zagrożenie ekologiczne środowiska przyrodniczego. Dodatkowo należy zwrócić uwagę na korzystanie w ten sposób z odnawialnych źródeł energii, których pozyskiwanie jest obecnie bardzo ważne. Dostępność i możliwość zastosowania materiałów proekologicznych w celu umocnienia górnego i dolnego stanowiska poprawia nie tylko stronę wizualną, ale i ogranicza niepożądane procesy morfologiczne wywołane zaburzeniem warunków przepływu. W artykule przedstawiono przykładowy schemat doboru parametrów technicznych elektrowni wodnej oraz przegląd materiałów wykorzystanych do umocnienia górnego i dolnego stanowiska.

EN

Construction of hydroelectric power plants on the existing water bar-rages may bring more benefits than potential damages. Damming water in the upper station may be used for power generation purposes without constituting an ecological threat to the natural environment. Moreover, it should be streesed that the power thus generated originates from renewable energy sources, what is very important nowadays. Availability and possibility to use pro-ecological materials in order to reinforce the upper and the bottom station brings not only aesthetic improvements but also reduces undesirable morphological processes resulting from disturbance of the flow conditions. The article presents an example choice of a hydroelectric power plant technical parameters and a review of materials used for reinforcement of the upper and the bottom station.