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Journal of Hydrology and Hydromechanics


Volume 50 / No. 2 / 2002

J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 77
Scientific Paper, English Language
Valentine E. M., Zulfiqar Ali, Swailes D. C.: A two-zone model for longitudinal dispersion in channels with idealized pools nd riffles, (Dvouzonovy model podelne disperze v korytech s idealizovanymi tunemi a prahy)

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  • A one-dimensional two-zone mathematical model, comprising a pair of advection-dispersion equations coupled by a mass exchange term, is proposed to study longitudinal dispersion in channels with sequences of pools and riffles. An implicit finite-difference numerical scheme is employed, and its effectiveness is assessed with reference to known analytical solutions. Moreover, sets of longitudinal dispersion experiments were performed on various simple geometries of sequences of pools and riffles developed in a laboratory flume. The results were compared with corresponding numerical solutions to calibrate the two-zone model.


    KEY WORDS: Dispersion, Open-Channel Flow, Dead Zones, Pools and Riffles, Numerical Model.

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    Address: Eric M. Valentine, Senior Lecturer, Dept. of Civil Engineering, Univ. of Newcastle upon Tyne, NE1 7RU, UK. Zulfiqar Ali, Lecturer, Technical University of Lahore, Pakistan. David C. Swailes, Lecturer, Dept. of Engineering Mathematics, Univ. of Newcastle upon Tyne, NE1 7RU, UK.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 104
    Scientific Paper, Czech Language
    Danecek J., Ryl T., Riha J.: Stanoveni hodnoty koeficientu podelne hydrodynamicke disperze ve vodnich tocich resenim Fischerova integralu, (The determination of the longitudinal dispersion coefficient at water courses using Fischer integral)

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  • The text comprises the method of the determination of dispersion coefficient at water courses. The text follows the paper Dispersion Coefficient for Open Channels Profiles of Natural Shape [4], which was published in the J. Hydrol. Hydromech., 43, 1995, 1-2, 93–101. The resulting formulae (12) to (15) and values of longitudinal dispersion coefficients in that paper are deemed to be incorrect. The corrected results of the analytical solution are given in the paper together with the comparison with numerical and experimental results.


    KEY WORDS: Transport and Dispersion of Solids at Water Courses, Coefficient of Longitudinal Hydrodynamic Dispersion.

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    Address: Doc. RNDr. Josef Danecek, CSc., Ustav matematiky, FAST VUT, Zizkova 17, 662 37 Brno, Ceska republika. Ing. Tomas Ryl, PhD., Doc. Ing. Jaromir Riha, CSc., Ustav vodnich staveb, FAST VUT, Zizkova 17, 662 37 Brno, Ceska republika.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 114
    Scientific Paper, Czech Language
    Kybast I.: Experimentalni studie cela razove vlny v prazdnem kruhovem potrubi a odtoku vlny z potrubi, (Experimental investigation of the front of the shock wave in an empty circular pipe and the wave outflow from the pipe)

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  • An experimental study on initial water flow through an empty pipe under conditions of free level and steady inflow into the pipe. The study presents results of the analysis of experimental values of wave front velocity and outflow from a pipe and their experimental eqautions.


    KEY WORDS: Shock Wave, Empty Pipe, Wave Front Velocity, Outflow from a Pipe.

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    Address: Ing. Ivan Kybast, Katerinska 21, 120 00 Praha 2, Ceska republika.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 139
    Scientific Paper, Czech Language
    Jandora J., Danecek J.: Prispevek k pouziti analytickych metod reseni transportne disperzni rovnice, (Contribution to application of analytical methods solving advective-dispersion equation)

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  • All phenomena in nature are going on continuity way. All independent and dependent quantities are changing with time. Solving the problems of advection and dispersion of an observed component in a system of river network, influences of time and dispersion cannot be neglected in general. Since knowledge of hydraulic quantities (average velocity and cross sectional area) are presumed, a concentration c(x,t) of the observed component in a stream is the only unknown function. To determine this function c(x, t), one equation is needed – Advective-Dispersion Equation (ADE). ADE expresses law of mass conservation. The paper deals with analytical solutions of problems of transport and dispersion of the observed component in streams, namely for steady and unsteady problems. Analytical solutions are useful for validation of numerical solutions and for sensitivity analysis. The sensitivity analysis helps to determine influences of a separate coefficient of a model. Analytical solutions are derived dfor constant velocity, constant discharge and constant cross-sectional area. Also it is assumed constant dispersion coefficient.


    KEY WORDS: Dispersion, Concentration of Observed Component, Mathematical Modelling, Water Quality.

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    Address: Ing. Jan Jandora, PhD., Ustav vodnich staveb, Fakulta stavebni, VUT v Brne, Zizkova 17, 662 37 Brno, Ceska republika. Doc. RNDr. Josef Danecek, CSc., Ustav matematiky a deskriptivni geometrie, Fakulta stavebni, VUT v Brne, Zizkova 17, 662 37 Brno, Ceska republika.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 158
    Review, English Language
    Kovar P., Cudlin P., Herman M., Zemek F., Korytar M.: Analysis of flood events on small river catchments using the kinfil model, (Analyza povodnovych udalosti na malych povodich s vyuzitim modelu INFIL)

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  • This paper deals with some ways of carrying out an analysis of a flood event using the KINFIL hydrological model on small catchments where both land use and management play a significant role, and where these human activities can influence design discharges. The combination of GIS techniques with the KINFIL model, which is conceived on physically based infiltration approach and on a kinematic wave transformation of direct runoff, provides a tool for analysing historical rainfall-runoff events, for assessing design discharges, and for simulating some hypothetical flood scenarios. KINFIL is a complex model using the correspondence of Curve Number (CN) with soil parameters and the correspondence of kinematic wave transformation with the physiographical parameters of the Všeminka catchment in Eastern Moravia (Czech Republic), which was used in the tests. Two versions of the KINFIL model (KINFIL1, KINFIL2) were implemented. The infiltration part of the model is the same in both versions. KINFIL 1 assumes a more schematic geometrization of the catchment topography, distributing the catchment area to a V-shaped form in which a main channel collects direct runoff from both side planes or segments. This is not fully in accord with the topography of the sub-catchment. KINFIL 2 is a more sophisticated version, where the topography is GIS-organized, taking fully into account the river network and its corresponding sub-catchment division. The latter version is geographically (and also physically) better based, and the results of the simulation of the July 1997 flood waves in the Vseminka experimental catchment fit better with the observed waves. All the topographical and morphological data were analysed and prepared for the KINFIL model (particularly for the KINFIL 2 version), using GIS facilities. Thus the KINFIL 2 version can be applied in future for design discharge assessment when simulating scenarios of various land uses expressing the model parameters.


    KEY WORDS: Infiltration Approach, Kinematic Wave, GIS, Rainfall-Runoff Models, Water Balance Models.

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    Address: P. Kovar, M. Korytar, Czech University of Agriculture Prague, Forestry Faculty, Kamycka 129, 165 21 Praha 6, Czech Republic. P. Cudlin, M. Herman, F. Zemek, Institute of Landscape Ecology, Academy jof Sciences, Na Sadkach 7, 370 05 Ceske Budejovice, Czech Republic.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 172
    Discussion, Slovak Language
    Urcikan P.: Odpoved na diskusny prispevok Jozefa Turcana k studii Pavla Urcikana a Dusana Rusnaka "K navrhu objemu detencnych dazdovych nadrzi na malych povodiach" (J. Hydrol. Hydromech., 49, 2001, 6, 428-431)), (Reply to the "Comment" on paper "Urcikan P., Rusnak D., Sizing of detention tanks for small watersheds" (J. Hydrol. Hydromech., 49, 2001, 6, 428-431) by J. Turcan

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    Address: Pavel Urcikan, Kyjevska 4, 831 02 Bratislava, Slovenska republika.

    J.Hydrol. Hydromech., Vol. 50, No. 2, 2002, p. 180
    Information, Slovak Language
    Sikorova T., Fillo L.: Zomrel Prof. Ing. Dr. Techn. Jozef Trokan, (Prof. Ing. Dr. Techn. Jozef Trokan is dead)

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    KEY WORDS: Data not available

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    Address: Mgr. Tatiana Sikorova, prof. Ing. Ludovit Fillo, PhD., Stavebna fakulta, STU, Radlinskeho 11, 813 68 Bratislava, Slovenska republika.

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