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Labe IV: Dynamika polutantů v hlavním korytě a v údolní nivě českého Labe
Vysoké učení technické v Praze, Fakulta stavební ; Výzkumný ústav vodohospodářský T.G. Masaryka, Praha ; Barth, Johannes ; Valentová, Jana ; Valenta, Petr ; Hein, Ivan ; Urban, Karel ; Hájek, Radvan ; Balvín, Pavel ; Blažková, Šárka ; Rudiš, Miroslav
Výsledky prezentované v této práci byly získány v rámci Projektu Labe a mezinárodního projektu AquaTerra sponsorovaného Evropskou Unií. Na základě předchozích výsledků byla vyřešena sedimentace plavenin re-suspendovaných v říční nádrži katastrofální povodní v údolní nivě pod nádrží dvourozměrnou matematickou simulací. K tomu byl stávající model FAST 2D rozšířen o sedimentační člen. Výsledek tvoří mapa údolní nivy, v níž jsou barvami znázorněny vrstvy sedimentů v kg/m2.
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Labe IV: Dynamika polutantů v hlavním korytě a v údolní nivě českého Labe
G-impuls, s. r. o. ; Vysoké učení technické v Praze, Fakulta stavební ; Výzkumný ústav vodohospodářský T.G. Masaryka, Praha ; Lobe, Ingo ; Hrubec, Karel ; Valenta, Petr ; Hein, Ivan ; Urban, Karel ; Hájek, Radvan ; Balvín, Pavel ; Rudiš, Miroslav
Ve zprávě jsou vytypovány 3 oblasti, ve kterých jsou obsaženy staré zátěže polutantů nebezpečné buď z hlediska množství nebo z hlediska vysokých koncentrací. Jedná se o přehradu Les Království, tzv. zimní přístav Pardubice kam ústí Jesenčanský potok odvodňující areál petrochemického závodu Paramo Pardubice a konečně úsek koryta Labe mezi Mělníkem a Lovosicemi, v němž se za starými, nyní většinou zatopenými koncentračními hrázkami usazovaly sedimenty v období, kdy čištění odpadních vod bylo nedostatečné. Byly definovány podmínky aplikace simulačního prostředku FAST 2D na řešení účinku katastrofální povodně nesoucí plaveniny na údolní nivu.
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Sedimentation of dilute suspension in intermediate region
Vlasák, Pavel ; Chára, Zdeněk
The present paper describes the results of experimental investigation of the continuous sedimentation of a dilute model of fine-grained suspension in the intermediate region of settlement. The effects of particle size (glass beads of average diameter 150–850 μm), concentration, and inclination of the vessel axis on particle fall velocity were evaluated. It was confirmed that the local relative particle-liquid velocity has a practically constant value across the vessel cross-section. The settling pattern is strongly affected even by a very gentle slope of the vessel axis, which causes an asymmetrical absolute velocity profile and significant increase of the local concentration and absolute fall velocity of particles near the upward-facing wall of the vessel.
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Feasibility of performing laboratory tests in the paediatrician´s office
HOLOUBKOVÁ, Hana
The thesis deals with feasibility of performing laboratory tests in the paediatrician´s office. The objective of my thesis was to learn about the current state of feasibility of performing laboratory tests right in the paediatrician´s office. To meet this objective I distributed questionnaires and visited twenty randomly selected pediatricians. Thereby I got familiar with the structure of tests used in paediatric practice. I have learnt to perform and interpret relevant laboratory methods. The theoretical part of the thesis gives an account of examinations carried out in paediatricians´ offices. It deals in detail with laboratory analyses performed on urine, blood, stool and swab samples. The practical part gives a description of techniques of particular methods and their current use in paediatricians´ offices. These methods are chemical examination of urine by using urinalysis reagent strips, examination of the urine sediment, Uricult examination, C-reactive protein determination, determination of sedimentation rate, determination of glycemia using glucometer, test for occult bleeding, rotavirus and adenovirus assay, Dentocult examination and detection of Streptococcus pyogenes. The results shown in graphs illustrate how frequently the methods are performed.
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Initial velocities of free-settling spherical particle
Chára, Zdeněk ; Kysela, Bohuš
The paper deals with experimental research of the initial phase of free-settling spherical particle which density is close to the density of water. The experiments were carried out with a smooth particle as well as with a particle with a rough surface. The obtained results show that in the initial phase of sedimentation, there is a formation of vortex structures, which are reflected in the increase of resistance in coefficient values.
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Effect of ultrasound pulsations on suspension sedimentation
Suchánková, A. ; Kysela, Bohuš ; Chára, Zdeněk ; Ditl, P.
The paper presents results of a gravity settling of a model suspension. Experiments have been carried out for two configurations. The first experiment involved natural gravity settling; in the second case the ultrasound pulsations were introduced. Ultrasound field was provided by 20 kHz horn acting through a wall of settling vessel. Three kaolin suspensions of volume concentrations 3.8; 7.6; 11.4 % were used. It has been found that there is no significant influence of ultrasound pulsations on suspension settling.
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Phosphorus release from sediments - a comparison of methods
Borovec, Jakub ; Brzáková, Martina
Phosphorus release rates from sediments were compared at two localities of Jordan Reservoir (Czech Republic) during the year. The release rates measured by incubation method were an order of magnitude higher comparing to the release rates calculated from phosphorus gradient in pore-water. A rapid decomposition of freshly settled seston at the sediment surface or just above the sediment was suggested to explain the differences.
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