2/2013

 

Flood risk maps and flood hazard maps in the river basin Olšava

Marcela Gergeľová, Žofia Kuzevičová, Juraj Gašinec, Jana Sabolová, Štefan Kuzevič

Abstract

European legislation "Directive 2007/60/EC" on the assessment and management of flood risk sets out the obligation to of all Member States of the EU to develop flood hazard maps and flood risk for the purposes of effective planning in flood risk management. This obligation applies to the Slovak Republic too. The aim of this paper is to develop flood hazard maps and risk of Olšava basin located in the southwestern part of eastern Slovakia. Created map outputs will reflect the selected hydrologic and hydraulic flood situation, which will be applied to the combination of numerical hydrodynamic modeling options and tools of geographical information systems (GIS). In solving the issue will be taken into account recommendations of European legislation and national legislation in the field of flood risk assessment.

Keywords: hydrodynamic modeling, GIS tools, flood risk maps, flood hazard maps

original scientific work


We would like to apologize that this article was published twice in this year.


 

 

Proposal of a method enabling an assessment of the effect of linear erosion control measures on surface runoff parameters in a small catchment

Jakub Feltl, Petr Doležal

Abstract

This paper presents a proposed method that allows the assessment of the effect of linear erosion control measures on the basic characteristics of surface runoff (runoff volume and peak flow values). The method uses advanced software (GIS, HEC-HMS), which allows an assessment of the effect of linear erosion control measures on the characteristics of surface runoff immediately below the proposed element as well as at any location in the basin, such as the outlet profile. The method allows the implementation of technical linear erosion control and flood control measures (broad base channels, broad base terraces) into the schematized basin. A single rainfall-runoff model can be used to simultaneously investigate the effect of different kinds of proposed measures on the parameters of surface runoff. This method provides designers with larger amounts of background data to select the optimal solution of the proposed measures. In practice it can be used in the design of local protection of property endangered by torrential rainfall from a basin above the urban area. It allows the effectiveness to be assessed and can also lead to the optimal solution both in terms of safety and economy. The use of the modern software mentioned above also offers the possibility to use all the available data, thus facilitating further work.

Keywords: broad base channel, broad base terrace, flood control, rainfall, retention


original scientific work


 

 

Current stage of green roofs and living walls as an urban ecosystem in sustainable development

Zuzana Poórová, Zuzana Vranayová

Abstract

To Adam he said,”Because you listened to your wife and ate fruit from the tree about which I commanded you, ´You must not eat from it, ´ “Cursed is the ground because of you; through painful toil you will eat food from it all the days of your life. It will produce thorns and thistle for you and you will eat the plants of the field. By the sweat of your brow you will eat your food until you return to the ground, since from it you were taken; for dust you are and to dust you will return.” Key factor of not forgetting our past, what we have been given and living for our future is balance of artificial environment and natural environment. As forests, fields, gardens and urban lands are being replaced with bituminous, concrete and unnatural surfaces; necessity of recovering green spaces and natural areas is becoming more and more critical. Novelty in co-operation of landscape and dwelling is bringing nature to city, making green fashionable, making green roofs fifth façade of the building, designing health and vegetated towns. Very old method of improving sustainability is making green the key element in environmental strategy, but also in every human´s life.

Keywords: Balance of Artificial and Natural Environment; Ecosystem; Living Wall Systems; Nature in Cities; Sustainability; Vegetated Roofs


original scientific work


 

 

Design of parameters for river surfing wave

Tomáš Andrássy

Abstract

River surfing – sport where surfers are using static waves which in ideal condition (shape, steepness, speed…) could hold surfer on the wave while surfer could move there and do tricks. Against of classic surfing main difference is that wave are not moving forward as tidal wave on the ocean but it is static situated somewhere on the river, artificial course or artificially build. In last few decades river surfing became fast grooving sport while it is not many place where surfers could practice and therefore it is more than necessary to develop a methodology for building new river surfs spots. This article deals with designing of parameters for river surfing waves. On the base of prepared research which will take place at Slovak technical university at faculty of civil engineering at department of hydraulic engineering in Bratislava will be finally developed methodology for designing a wave for river surfing at random place (assumption: at the river or nearby) when will be fulfilled basic criterions and respected design parameters.

Keywords: River surfing, wave, laboratory modeling, Cunovo wild water course

original scientific work


 

Research of groundwater flow in flood situation at Sihoť island

Tomáš Andrássy, Dana Baroková

Abstract:

During passing of flood wave through river it occurs increasing of groundwater level and thus direct threat of property and especially the groundwater resources (water supply) which are located near the affected rivers. Since during the floods water is polluted the solution of this problem is more than necessary.  By transition of flood waves occurs time retardation (increase of groundwater level can be after a few weeks) and lateral retardation (groundwater increases reach in a direction perpendicular to the flow) of spreading groundwater. To these conditions we must adapt also operating of groundwater sources located near rivers. As inputs in the research will be used specific data from those areas (geological, hydrogeological, hydrological data from the site) Based on the input data, the model will be calibrated, verified and then will be used to forecast groundwater flow during passing flood wave and for subsequent determination of impact to  groundwater sources. Outputs from the model will be used for design of operational plan for groundwater sources during floods. Outputs more help understand groundwater flow in flood situations. One of the outcomes will be also threat maps of groundwater sources near rivers. Maps will be in digital and graphical form. On maps will be show the direction of groundwater flow - which direction and at what time it gets to water pollution

Keywords: Groundwater research, Modeling Sihot island, Triwaco,


original scientific work


 

Mathematical modelling of flow of water

Ivan Valachovič, Radomil Květon

Abstract

The purpose of this study was to assess the impact and use of   2D and 3D modeling of real objects in the water management practices for building small hydropower Dobrohošť sampling. For this purpose, in order to address this issue following questions:

· Effect on the submersible walls MVE Dobrohošť object

· The possibility of biological facilities flow

· The resulting speed fields

· Performance 2D model

· The question of the possibility of using 3D model

The work was designed 2D and 3D model on a finite differences method and the derivation of the shallow water equations.

Keywords: Mathematical, modeling, water flow


original scientific work


 

Verification of cyclic CBR test with constant stress

Maialen Arbide, Lenka Ševelová

Abstract

In order to design rural roads, it is necessary to know the elastic behaviour of the soil.  Such information can be obtained through repeated load triaxial testing, but this test is demanding, complicated and expensive, and not available in many laboratories. A novel method presented by a Dutch investigation is being verified in Mendel University that allows calculating the elastic modulus by using the elastic deformation measured in repeated load CBR test. After verifying the test with a constant depth, nowadays the test with a constant stress is being analysed and the first results are presented in this article.

Keywords: Cyclic CBR, elastic modulus, roads surface, rural roads, soil


original scientific work


 

Effective modulus from cyclic CBR test

Xabier Rivera Sevilla, Lenka Ševelova

Abstract

In the construction of rural roads, as happens with urban roads, there is a big modification in the look of the area and there is a need of knowledge to work on it. It is very important to know what is going to be the mechanical behavior of the soil in which the road is going to be built. The property that best defines that behavior is the resilient modulus. Until now, the most used method to calculate this modulus uses the data obtained from CBR standard test, but that information does not describe the nature of the soil. Some tests are being carried out with the CBR machine at Mendel University, using the research done by Molenaar, in order to develop a new method that describes better the behavior of the soil.

Keywords: rural roads, CBR cyclic test, mechanical behavior of soil, modulus of elasticity
original scientific work