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Přihlášení
2/2017
The impact of carp pond aquaculture on nutrient loading of the Vranov reservoir
Zdeněk Adámek, Roman Hanák, Stanislav Ryšavý, Jana Konečná
Abstract
Fish ponds are historically coherent part of Czech landscape. They fulfil many different functions - production and non-production (ecological, aesthetic, recreation, retention, nature protection etc.) which are presented as a mutlipurpose use of ponds. Fishpond farming is known to be tightly linked to its surrounding environment, influencing it and being also reciprocally influenced by it. The paper deals with the influence of carp pond farming and reservoir management on quality of water outflowing from ponds and reservoirs in a wider watershed context. The respective phosphorus and nitrogen loadings from pond aqauculture and reservoir management correspond to 5.3 and 0.6 % of all sources in the Czech part of the Vranov reservoir catchment area.
Key words: functions of ponds in landscape, fish production, nitrogen, phosphorus, pond outlet, surface water quality
original research paper
Groundwater resources controll during extreme situations
Dana Baroková, Michaela Červeňanská, Zinaw D. Shenga, Andrej Šoltész
Abstract
Sihoť Island, was chosen as one of the most significant area for groundwater supply in Bratislava as the specific area for problem with flooding. When a flood wave passes along the River Danube, the groundwater level rises, hence property is directly threatened and, in particular, the groundwater resources for the water supply located near the affected rivers increase. During the flood period water in the river is polluted and solution of this problem is more than necessary. Sihoť Island is flooded repeatedly every year with several floods. Therefore, it is more than necessary to analyse interaction between groundwater and Danube River water level regime.
Key words: groundwater flow modelling, flood situation, TRIWACO, Sihoť Island
original research paper
Numerical modelling of groundwater to assess the impact of proposed railway construction on groundwater regime
Dana Baroková, Andrej Šoltész, Zinaw Dingetu Shenga
Abstract
The new proposed railway network in city of Bratislava, which is supposed to be connected to the airport, is an integral part of Trans-European Network for Transport (TEN-T). Certain section of the planned railway should be constructed along Carpathian Mountains through underground tunnels. However, the construction of this underground tunnel will adversely affect the groundwater flow regime. Therefore, it was necessary to establish a 2D finite element numerical model to evaluate the implementation of this railway tunnel on the groundwater regime as well as means of technical measures to reduce the impacts. The paper presents the model result, analyses, prognosis as well as possible methods control the groundwater level regime in the aquifer that could be affected by the railway tunnel construction.
Key words: finite element method, groundwater modelling, groundwater/surface water interaction, TRIWACO, underground wall
original research paper
Theoretical and methodological approach to quantification of the value of the recreational use of forests
David Březina, Dalibor Šafařík, Jitka Fialová, Petra Hlaváčková, Jakub Michal
Abstract
The design of the project reflects the needs of the valuation practice, which currently cannot quantify the utility value of the recreational function of forests, which could be put to use by making it on the markets with ecosystem services. This paper concentrates on quantifying the utility value of the impact of the recreational function of forest ecosystems. The main goal of the project is to create a methodology which would enable to determine the usual (market) value of the recreational use of forests in the case when a real market demand occurs. The created theoretical and methodological instrument can be used in the valuation practice to valuate functions of forest ecosystems and to create forest management methodologies and policies at both national and international level.
Key words: economics, forestry, forest enterprise, recreational functions, socio-economic functions, valuation method
original research paper
Numerical modelling of hydromorphodynamic development of river restoration scenario
Daniel Buček, Martin Orfánus, Peter Dušička
Abstract
Changes in river morphology caused by sediment transport are of major concern when planning a river structure or river restoration. Insufficient attention to future morphological development can in long run lead to poor performance of a given hydraulic structure or added maintenance cost. It’s even more valid for river restoration projects, where nature is at stake and poorly executed project can even lead to the exact opposite of the initial intent, degradation of local habitats. The subject of this study is cut-off meander DVII located at 19th km of river Morava.
Aim of this paper is to assess morphologic development of mentioned cut off meander for proposed restoration scenario. Change in bed morphology was computed with the aid of two-dimensional hydrodynamic flow model with movable bed R2DM.
River restoration scenario proposes widening of current inadequate inlet and outlet channels to approx. one third of the original width of meander. 10 simulated days of bankfull discharge, which roughly translate to one year, resulted in significant aggradation in the inlet channel reducing flow capacity by 10% for bankfull discharge and inadequacy for average discharge.
Key words: hydrodynamic, modelling, river restoration, sediment transport
original research paper
Specific hydraulic design of the whitewater course
Lea Čubanová
Abstract
A whitewater course is an artificial channel with obstacles to achieve suitable flow conditions for wild water sports. Specific solution of the whitewater course design at the Hornád River was embedding of this course to the existing river bed with smaller modifications (sheet pile wall, 2 fixed weirs), providing the flood protection of the town Košice. For successful whitewater course design, a cooperation between watermen, water management experts and hydraulic engineers is required.
Key words: whitewater course, Hornád river, hydraulic design
original research paper
Dam break of the Liptovská Mara - 2D hydrodynamic model
Radomil Květon, Peter Šulek , Martin Orfánus, Martin Mišík, Marián Kučera
Abstract
Up-to-date modelling tools and high effective computers are creating the two dimensional modelling of water flow more accurate for large territories. The submission is defining the results interpretation of two dimensional modelling as well as dam break modelling. Also the adjustment of results from flow model MIKE 21 FM with flexible computing mesh is described for territory of river Váh.
Key words: dam break, flood, hydrodynamic model
original research paper
Touristic management of forest landscape and beekeeping from Southern Dobrogea, Romania
Marius Popescu, Romulus Gruia, Daniela Jitariu
Abstract
Southern Dobrogea is an unit tableland from South-Eastern part of Romania, providing natural environmental conditions favorable to beekeeping, as a traditional activity. Research methodology is represented by bibliographic documentation, and field research in order to identify forest landscape as resources for beekeeping, villages with cultural resources, and apiculture potential. By mapping are proposed and highlighted touristic routes, with beekeeping profile named Honey Road, that will contribute to promote beekeeping, as a traditional activity, and to protect forest landscape. The aim of this study is to define the beekeeping touristic specific in Southern Dobrogea by integrating the forest landscape, and cultural resources, as an alternative form of tourism, that will contribute to the sustainable, and socio-economic development of rural communities of this area.
Key words: bee, Dobrogea, environment, rural, tourism
original research paper
Model Research on Inclined Flat Bar Screenings
Ján Rumann, Miroslav Tvrdoň
Abstract
An important part of any small hydropower plant is the intake structure. Its main function is to provide sufficient discharge of water for the hydropower plant and to prevent the large floating objects carried by the stream to get to the hydropower plant. In many cases, this structure requires a weir construction across the riverbed which is often environmentally unacceptable. In cases where such a construction is not possible, another kind of the intake structure has to be used, for example a bank water intake. An important part of these low-head intakes are the coarse screenings which prevent floating objects to get in the hydraulic system of the turbine and endanger the operation of the entire hydropower plant. These floating objects are captured on screenings and afterwards they should be cleaned (removed from the screening). The cleaning for low-head small hydropower plants is usually manual. A new type of self-cleaning screenings has been tested in the hydraulic laboratory of the Department of Hydraulic Engineering at the Faculty of Civil Engineering in Bratislava. Compared to the conventional design of the screenings with minimal flow resistance, the new design of screenings has far larger hydraulic resistance in order to effect the flow to float the object along the screenings. The experiments were aimed to determine the optimal inclination of the screenings to minimize the hydraulic resistance on the flow in the intake structure and achieve a self-cleaning effect keeping the screenings clean of the floating debris. The experiments were realized on a model in experimental flume for different variations of inclination of the screenings.
Key words: coarse screening, hydraulic research, intake structures, low-head small hydropower plants, physical modelling, velocity fields
original research paper
The design of sewage system in part of Kosice City
Adam Repel, Martina Zeleňáková
Abstract
The development of public sewerage systems lags behind that of public water supplies. The number of connected inhabitants is increasing continuously, rising from 50.8 % in 1990 through 54.7 % in 2000 up to 65.2 % in 2015. The spatial distribution of municipalities in Slovakia connected to the public sewerage system is not homogenous. District Košice-surroundings belongs to ones with the less numbers of population connected to the sewerage system.
This article is focused on the design of sewage system in part of Kosice City. The concerned territory is located in four cadastral territories. Sewerage is proposed for the planned extension of the housing area in cadastral of Krasna, as well as for villages Kosicka Polianka and Sady nad Torysou, which currently do not have sewage system. The total prospective population to be connected to the proposed sewage system is 48 570. The drainage is designed to be as gravitational as possible. Because it is a relatively flat area, the proposed sewage system contains several pumping stations. The existing waste water treatment plant in Kosice will be used for water water treatment.
Key words: sewage, waste water, sewage treatment plant
original research paper
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