Wyświetlanie pozycji 1-20 z 26

  • Experimental measurement and numerical modeling of cavitating flow in converging-diverging nozzle 

    Rudolf, Pavel; Hudec, Martin; Zubík, Pavel; Štefan, David (EDP Sciences, 2012-04-16)
    Paper presents results of the experimental research and computational modeling aimed on cavitating vortical structures induced by swirling flow. An experimental circuit was built with swirl generator and converging-diverging ...
  • The influence of roughness on the discharge coefficient of a broad-crested weir 

    Pařílková, Jana; Říha, Jaromír; Zachoval, Zbyněk (Institute of Hydrology SAS, 2012-06-01)
    The use of environmentally-friendly materials in hydraulic engineering (e.g. the stone lining of weirs at levees) calls for the more accurate estimation of the discharge coefficient for broad-crested weirs with a rough ...
  • Zone of flow separation at the upstream edge of a rectangular broad-crested weir 

    Zachoval, Zbyněk; Mistrová, Ivana; Roušar, Ladislav; Šulc, Jan; Zubík, Pavel (Institute of Hydrology of the Slovak Academy of Sciences, Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic, 2012-12-01)
    The paper deals with the determination of the basic characteristics of flow at the crest of a rectangular broad-crested weir and in detail with the characteristics of flow separation at the upstream edge of the weir crest. ...
  • Shape of the nappe during free overfall from a rectangular channel with zero bed slope 

    Zachoval, Zbyněk; Böhm, Petr; Pařílková, Jana; Šafář, Robert; Šulc, Jan (Institute of Hydrology of the Slovak Academy of Sciences, Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic, 2013-09-02)
    The paper deals with selected procedures used to calculate the shape of compact nappe during free overfall from a smooth horizontal channel with rectangular cross section. Calculated and measured water surface and velocity ...
  • Discharge coefficient of a rectangular sharp-edged broad-crested weir 

    Zachoval, Zbyněk; Knéblová, Michaela; Roušar, Ladislav; Rumann, Ján; Šulc, Jan (Institute of Hydrology of the Slovak Academy of Sciences, Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic, 2014-04-01)
    This paper is concerned with the determination of the relationship for the calculation of the discharge coefficient at free overflow over a rectangular sharp-edged broad-crested weir without lateral contraction. The ...
  • A simple model for the estimation of the number of fatalities due to floods in central Europe 

    Brázdová, Miriam; Říha, Jaromír (Copernicus Publications, 2014-07-30)
    In this paper a model for the estimation of the number of potential fatalities is proposed based on data from 19 past floods in central Europe. First, the factors contributing to human losses during river floods are listed ...
  • Numerical and experimental investigation of swirling flow in a conical diffuser 

    Štefan, David; Zubík, Pavel; Hudec, Martin; Rudolf, Pavel (EDP Sciences, 2014-11-18)
    The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out ...
  • Flow characteristics at trapezoidal broad-crested side weir 

    Říha, Jaromír; Zachoval, Zbyněk (Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic, 2015-04-01)
    Broad-crested side weirs have been the subject of numerous hydraulic studies; however, the flow field at the weir crest and in front of the weir in the approach channel still has not been fully described. Also, the discharge ...
  • Numerical and experimental investigation of swirling flow in a conical diffuser 

    Štefan, David; Zubík, Pavel; Hudec, Martin; Rudolf, Pavel (EPJ Web of Conferences, 2015-05-06)
    The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out ...
  • Study of Dam-break Due to Overtopping of Four Small Dams in the Czech Republic 

    Alhasan, Zakaraya; Jandora, Jan; Říha, Jaromír (Mendel University in Brno, 2015-07-01)
    Dam-break due to overtopping is one of the most common types of embankment dam failures. During the floods in August 2002 in the Czech Republic, several small dams collapsed due to overtopping. In this paper, an analysis ...
  • Discussion on the Safety Factors of Slopes Recommended for Small Dams 

    Vrubel, Jan; Říha, Jaromír (Mendel University Press, 2017-03-06)
    The design and assessment of the slope stability of small embankment dams is usually not carried out using slope stability calculations but rather by the comparison of proposed or existing dam slopes with those recommended ...
  • Earth-Fill Dam Monitored by EIS Method during Application of Nutrient Aqueous Solution used in BioSealing Method 

    Pařílková, Jana; Gjunsburgs, Boriss; Zachoval, Zbyněk; Veselý, Jaroslav; Műnsterová, Zuzana (IOP Publishing, 2017-10-25)
    The paper gives short information about the results of monitoring the electrical properties of an earth-fill dam during the application of a nutrient aqueous solution used in the method BioSealing. Monitoring is carried ...
  • Evaluation of groundwater contamination in former military airport area 

    Petrula, Lubomír; Říha, Jaromír; Julínek, Tomáš (Croatian Association of Civil Engineers, 2018-05-10)
    The analysis of groundwater contamination at the former military airport, due to fuel tanks leakage and other accidental spills, mainly involving polycyclic aromatic hydrocarbons (PAH), is presented in the paper. It was ...
  • Bankside trees and shrubs - specifics of the proposal for the vegetation arrangement 

    Šlezingr, Miloslav (Web of conference, 2018-06-29)
    popis publikace: Bankside trees and shrubs are an important element in landscape enhancement.
  • Assessment of empirical formulae for determining the hydraulic conductivity of glass beads 

    Říha, Jaromír; Petrula, Lubomír; Hala, Mario; Alhasan, Zakaraya (De Gruyter Open, 2018-08-14)
    Empirical formulae are often used in practice to quickly and cheaply determine the hydraulic conductivity of soil. Numerous relations based on dimensional analysis and experimental measurements have been published for the ...
  • Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs 

    Říha, Jaromír; Duchan, David; Zachoval, Zbyněk; Erpicum, Sébastien; Archambeau, Pierre; Pirotton, Michel; Dewals, Benjamin (VEDA, SLOVAK ACAD SCIENCES, 2019-12-19)
    Shallow-water models are standard for simulating flow in river systems during floods, including in the nearfield of sudden changes in the topography, where vertical flow contraction occurs such as in case of channel ...
  • Analysis of Seepage in a Laboratory Scaled Model using Passive Optical Fiber Distributed Temperature Sensor 

    Ghafoori, Yaser; Maček, Matej; Vidmar, Andrej; Říha, Jaromír; Kryžanowski, Andrej (MDPI, 2020-01-29)
    Abstract: Seepage is the key factor in the safety of dikes and earthfill dams. It is crucial to identify and localize the seepage excesses at the early stages before it initiates the internal erosion process in the structure. ...
  • Mapping of uplift hazard due to rising groundwater level during floods 

    Julínek, Tomáš; Duchan, David; Říha, Jaromír (Wiley, 2020-02-24)
    European Directive 2007/60/EC only briefly mentions the problem of hazard arising due to groundwater flooding, and techniques for the mapping of hazard occuring due to rising groundwater have not yet been scientifically ...
  • Unsteady Flow and River Bed Stratification Mutual Impact on Scour at the Abutments 

    Gjunsburgs, Boriss; Pařílková, Jana (University of Split, 2020-04-08)
    The floods of different probability, sequence, frequency, duration, and the riverbed with different grain sizes, numbers, sequences, and thickness of the layers are one of the reasons for the bridge`s abutments failure ...
  • Dam Break Modeling in a Cascade of Small EarthenDams: Case Study of the Cizina River in the Czech Republic 

    Říha, Jaromír; Kotaška, Stanislav; Petrula, Lubomír (MDPI, 2020-08-17)
    Failures of small dams can pose a serious threat to people and property even if the size of the schemes is relatively low. In many cases, small dams are situated in a cascade along streams, meaning that the failure of the ...