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Journal of Hydrology and Hydromechanics


Volume 50 / No. 4 / 2002

J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 285
Scientific Paper, English Language
Sacheti Nirmal C., Chandran Pallath: Steady creeping flow of an inelastic fluid past a rigid sphere, (Pomale obtekanie pevnej gule neelastickou tekutinou)

Full text is not available 

 
  • An analytical solution for the creeping flow of an inelastic fluid past a solid sphere has been obtained using an empirical 3-parameter fluid model. The governing equations of motion have been solved aproximately using a perturbation approach. Expressions have been obtained for the Stokes stream function and the drag experienced by the stationary sphere. It is shown that the drag for the non-Newtonian fluid is greater than the one predicted by the classical Stokes formula.


    KEY WORDS: Non-Newtonian Fluid, Reiner-Philippoff Fluid, Creeping Flow, Stream Function, Drag

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    Address: Nirmal C. Sacheti, Pallath Chandran, Dwepartment of Mathematics and Statistics, College of Science Sultan Qaboos University, P.O.Box 36, PC 123, Al Khod, Muscat, Sultanate of Oman.



    J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 300
    Scientific Paper, English Language
    Ruzicka M., Kafkova D., Balejova M.: Sensitivity of the water quality model to the frequency of input data, (Citlivost modelu kvality vody na frekvenci vstupu dat)

    Full text is not available 

     
  • The object of presented article is to demonstrate how the frequency of input data can affect the results of mathematical modelling of reservoir ecosystems. The study was done for Rimov Reservoir, a water supply reservoir in the south of Bohemia. The 2-D water quality model CE-QUAL-W2 was used for the simulation. Among all input data only the inflow temperature and meteorological data have significant daily variation. For this reason the study focuses to the influence of frequency of these two data sets on the simulation results. The simulations were effectuated with data measured as hourly averages, as daily averages and three times a day and the simulation results were statistically evaluated. It is shown that in common hydrological and meteorological conditions the simulation mean error is in acceptable limits, only in case of more important discharges and inflow temperatures they become more significant. The study leads to the conclusion that it is not necessary to try to get the data measured with high frequency and that in the most cases the simulation using daily averages of input data is sufficient.


    KEY WORDS: Water Quality, Mathematical Modelling, Reservoir Ecosystem, Frequency of Input Data.

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    Address: Ing. Martin Ruzicka, CSc., Ing. Dagmar Kafkova, CSc., RNDr. Marcela Balejova, CSc., Ustav pro hydrodynamiku AV CR, Pod Patankou 5, 166 12 Praha 6, Ceska republika, mailto: ruzickam@esnet.cz, kafkova@ih.cas.sz, balejova@ih.cas.sz

    J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 311
    Scientific Paper, English Language
    Slezingr M.: Banko erosion - prognosis of the retreat of bank line of reservoirs, (Prognoza vzniku a rozvoje brehove abraze)

    Full text is not available 

     
  • The problematics of creation and development of bank erosion, follow-up repairs of abrasion damaged banks and development of abrasion progress prognostic methods is often discussed. One of the contributions to this discussion is presentation of “Modificated Methods of Abrasion Terminal Line Determination“. The prognosis of bank erosion advance is determined also in areas, where original condition of bank is unknown. This method was successfully verified during years 1998–2001 at Brno Reservoir on the Svratka River and can be used at other dam reservoirs as well.


    KEY WORDS: Bank Erosion, Bank Abrasion, Dam, Bank Stability

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    Address: Dr. Ing. Miloslav Slezingr, Ustav vodnich staveb, VUT FAST Brno, Zizkova 17, 662 37 Brno, Czech Republic.

    J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 320
    Scientific Paper, Slovak Language
    Cipakova A.: Imobilizacia radionuklidov a kadmia v podach aplikaciou zeolitu, (The immobilisation of radionuclides and cadmium in soils using application of zeolite)

    Full text is not available 

     
  • Results of cadmium sorption and desorption, as well as distribution coefficients of cadmium in the soils from the Danubian Lowland and from Veľký Ďur (neighbourhood of the nuclear power plant Jaslovske Bohunice) are presented in this study. It was found that Cd adsorption is high in studied soils already after the one-minute lasting Cd-soil contact. The results obtained show that the highest sorption of cadmium is in the loamy-sand soil from Kalinkovo (99.75 %). Zeolite application was the most effective in the loam soil from Macov. Sorption of cadmium in this soil increased by 1.45%. The presence of zeolite in chosen soil samples influenced Cd desorption, too. In loamy-sand soil from Kalinkovo cadmium desorption decreased by 50 % after zeolite application. Sorption experiments with radionuclides (85Sr and 137Cs) were conducted on brown earth from the site Velľký Ďur. The 137Cs sorption is very high in studied soil. Zeolite is more effective in the case of 85Sr. Desorption of radiostrontium decreased by 50% after zeolite application.


    KEY WORDS: Soil, Sorption, Distribution Coefficient, Cadmium, Radiostrontium, Radiocaesium, Zeolite.

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    Address: RNDr. Andrea Cipakova, PhD., Statny zdravotny ustav, Ipelska 1, P.O.Box 42, 042 22 Kosice, Slovenska republika

    J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 341
    Review, Slovak Language
    Szolgay J., Hlavcova K., Kalas M.: Urcovanie vplyvu klimatickej zmeny na odtokovy proces, (Assessment of the potential impacts of climate change on river runoff)

    Full text is not available 

     
  • The paper reviews recent climate change impact studies for the Slovak National Climate Program (SNKP). Basic adaptation strategies are also discussed. Priorities for future research within the SNKP are suggested.


    KEY WORDS: Climate Change, River Runoff, Hydrological Models

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    Address: Prof. Ing. Jan Szolgay, PhD., doc. Ing. Kamila Hlavcova, PhD., Ing. Milan Kalas, Stavebna fakulta STU, Radlinskeho 11, 813 68 Bratislava, Slovenska republika.

    J.Hydrol. Hydromech., Vol. 50, No. 4, 2002, p. 372
    Review, Slovak Language
    Turcan J.: Medzny dazd v stokovani, (Critical rain in urban stormwater drainage)

    Full text is not available 

     
  • Overflow chambers on the combined sewerage systems are used for the overflow of the stormwater mixed with municipal wastewater. The overflowed compound of stormwater and wastewater is discharged into receiving waters directly without the previous treatment and the rest of mixed wastewater is conducted to the wastewater treatment plant. The critical rain is by definition [8] a rain specified by maximum intensity, the runoff from which is not allowed to discharge from the sewer network by overflow structures. Assignment of critical rain has to assure, that the wastewater discharged to the receiving water will not cause larger pollution as acceptable. New approach to improve the determination of the critical rain value is presented.


    KEY WORDS: SewerageStormwater Overflow, Stormwater Runoff Modelling

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    Address: Ing. Jozef Turcan, CSc., autorizovany stavebny inzinier, Komarnicka 24, 821 03 Bratislava, Slovenska republika, mailto: turcan@isternet.sk

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