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Runoff generation in urban environment
Píchal, Jan ; Daňhelka, Jan (advisor) ; Čekal, Radek (referee)
As the area of impervious surfaces at urban environment increases, the more rapid runoff and urban flash floods lead to frequent overflow of the sewer system. For storm water runoff prevention and mitigation, there are soakaways commonly built in newly build up areas. The soakaways volume calculation is given by ČSN 75 9010 regulation in the Czech Republic. The presented thesis verifies applicability of this regulation in selected study sites (smal basins) of projected building construction model basins, which differ with regard to their infiltration characteristics, slope, area and degree of planned urbanization. The runoff calculation was estimated by Clark's Unit Hydrograph (UH) transformation and triangular SCS UH. HEC-HMS software has been used for Clark's UH application. Triangular UH runoff calculation has been done using MS Excel environment to establish a series of equations and logical conditions. Both models' results were compared for storms with 5 years, 10 years, 100 years and theoretical maximum return period; thus also for storms with longer return period than is proposed in the regulation. The positive differences in soakaway peak overflows and peak runoffs in study sites before the start of the urbanization were compared and evaluated, together with the differences in soakaway...
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Runoff generation in urban environment
Píchal, Jan ; Daňhelka, Jan (advisor) ; Čekal, Radek (referee)
As the area of impervious surfaces at urban environment increases, the more rapid runoff and urban flash floods lead to frequent overflow of the sewer system. For storm water runoff prevention and mitigation, there are soakaways commonly built in newly build up areas. The soakaways volume calculation is given by ČSN 75 9010 regulation in the Czech Republic. The presented thesis verifies applicability of this regulation in selected study sites (smal basins) of projected building construction model basins, which differ with regard to their infiltration characteristics, slope, area and degree of planned urbanization. The runoff calculation was estimated by Clark's Unit Hydrograph (UH) transformation and triangular SCS UH. HEC-HMS software has been used for Clark's UH application. Triangular UH runoff calculation has been done using MS Excel environment to establish a series of equations and logical conditions. Both models' results were compared for storms with 5 years, 10 years, 100 years and theoretical maximum return period; thus also for storms with longer return period than is proposed in the regulation. The positive differences in soakaway peak overflows and peak runoffs in study sites before the start of the urbanization were compared and evaluated, together with the differences in soakaway...
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Evaluation of precipitation forecast from the point of view of hydrological forecasting in small catchments
Pecha, Martin ; Čekal, Radek (referee) ; Daňhelka, Jan (advisor)
In this work we have evaluated NWP ALADIN quantitative precipitation forecast (QPF) for selected headwater areas of the Czech part of the Elbe river basin. Work describes geographical characteristics of 9 small study basins, and gives an overview of important synoptic situations and theory of NWP ALADIN. Different applied statistical methods (f.e. double mass curve, CDF, frequency diagram, discrimination and reliability) are introduced. Results have proved over-forecasting of days with precipitations especially those of light precipitation up to 1 mm and partly also up to 5 mm. On the other hand basins that are not exposed to prevailing western flows show under-forecasting of precipitation higher than 8 mm. Evaluation also proved the significant change in forecasting performance due to change in model resolution in 2005. The change was more significant in basins exposed to west and in basins in middle altitudes and spatially limited highlands. Simple quantile transformation resulted in improvement of forecast of total long term volume of precipitation in most of the study basins. Powered by TCPDF (www.tcpdf.org)
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The influence of the different utilization of the landscape on the rainfall-flow process in the experimental drainage basins Zbytiny
Malý, Antonín ; Kliment, Zdeněk (advisor) ; Čekal, Radek (referee)
The diploma thesis deals with the problem of the influence of vegetation and artificial flow-off on the hydrological conditions of a small-scale drainage basin. The thesis presents the results of the detailed monitoring of the rainfall-flow process, carried out in two drainage basins compared in the period between 2006 and 2008.The research location is situated in the area of the upper drainage basin of the Šumava river Blanice, one of the sources of the devastating flood of 2002. Despite a limited period of monitoring, significant differences were identified in the hydrological regimes of the two drainage basins. The main differences discovered are related to the period of the winter half-year and the period of low water. In addition to common research procedures, less well-known methods have also been applied. Powered by TCPDF (www.tcpdf.org)
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Hydro-synoptic analysis of floods on Berounka basin
Kacíř, Jan ; Grünwaldová, Jiřina (advisor) ; Čekal, Radek (referee)
Hydro-synoptic analysis of floods on Berounka basin This thesis she aims to analyze the meteorological causes of floods, a database foundation flood situation and determine the potential effect of Šumava and Brdy flow of flood wave in Beroun. Overall, the relatively high impact of floods in Beroun have Úhlava (Šumava flow) and Klabava (Brdy flow). We can say that closer ties to the Šumava streams. Undoubtedly contributes to the shape of the basin after Serrated profile Plzen - Bílá Hora. Analysis of the meteorological causes of observed recurrent selected weather situations, but the most extreme floods (1978.1981, 2002) were caused by both type C. A detailed examination of the flood flows in the basin was prepared Berounka bank flood episodes. Keywords: Flood, the flood wave, basin Berounka, causal situation, hydro-synoptic analysis.
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