National Repository of Grey Literature 23 records found  beginprevious14 - 23  jump to record: Search took 0.01 seconds. 
Hydromorphological survey as a basis for restoration measures. Case study of the Rakovnik Brook catchment.
Maroušková, Kateřina ; Matoušková, Milada (advisor) ; Šípek, Václav (referee)
This thesis deals with use of hydromorphological assessment methods and the application of the Hydroecological monitoring HEM (Langhammer, 2007, 2013) method in the model basin of lower part of Rakovnický potok stream. This thesis presents results of the terrain survey and based on this results, the parts with poor ecomorphological conditions should be identified and restoration measures should be suggested to improve the hydromorphological quality and physical habitat of Rakovnický potok stream. This stream represents both almost natural parts of the catchment in Křivoklátsko Landscape Protected Area as well as parts which are influenced by human activities, especially by the agriculture and the industry. Due to the results of applied terrain survey and literature research, it was suggested to apply complex restoration in the whole area of Rakovnický potok basin immediately.
Seasonal probabilistic hydrological forecasting
Šípek, Václav
Seasonal hydrological forecasts represent a very current topic, especially in the context of extreme hydrological events that have taken place at the end of the 20th and beginning of the 21st century. These events are represented by large scale floods and long lasting periods of drought. This has led to a need for the effective water management strategies. These management strategies have to be able to efficiently distribute water resources both in the space and time. Seasonal hydrological forecasting systems constitute an essential part of water management strategies, as they enable the runoff estimation in a sufficient advance. This thesis deals with the seasonal hydrological forecasting system with a one month lead. The aim of this study is to apply three forecasting methods using an experimental watershed in the Czech Republic. The first method is represented by the reference climatology approach, the latter by the well-tested Ensemble Streamflow Prediction system (ESP), and the last by its newly proposed modification. This modification (modified ESP - mESP) is based on the restriction of input data established on their relations to the large scale climatological variables and patters. The first part of the thesis is focused on the investigation of possible relations among hydrometeorological...
Seasonal probabilistic hydrological forecasting
Šípek, Václav ; Daňhelka, Jan (advisor) ; Kašpárek, Ladislav (referee) ; Fošumpaur, Pavel (referee)
Seasonal hydrological forecasts represent a very current topic, especially in the context of extreme hydrological events that have taken place at the end of the 20th and beginning of the 21st century. These events are represented by large scale floods and long lasting periods of drought. This has led to a need for the effective water management strategies. These management strategies have to be able to efficiently distribute water resources both in the space and time. Seasonal hydrological forecasting systems constitute an essential part of water management strategies, as they enable the runoff estimation in a sufficient advance. This thesis deals with the seasonal hydrological forecasting system with a one month lead. The aim of this study is to apply three forecasting methods using an experimental watershed in the Czech Republic. The first method is represented by the reference climatology approach, the latter by the well-tested Ensemble Streamflow Prediction system (ESP), and the last by its newly proposed modification. This modification (modified ESP - mESP) is based on the restriction of input data established on their relations to the large scale climatological variables and patters. The first part of the thesis is focused on the investigation of possible relations among hydrometeorological...
Influence of catchment spatial subdivision on the accuracy of the snow accumulation and snowmelt model
Hájková, Barbora ; Jeníček, Michal (advisor) ; Šípek, Václav (referee)
Influence of catchment spatial subdivision on the accuracy of the snow accumulation and snowmelt model Abstract This thesis is focused on influence of catchment spatial subdivision on the accuracy of rainfall-runoff model simulations. A hydrological model HEC-HMS developed by U.S. Army Corps of Engineers was applied in the thesis. Study area includes two experimental catchments; Bystřice River basin and Zlatý Brook basin. Both catchments are located in the Krušné Mountains. The research in catchments has been carried out by the Department of Physical Geography and Geoecology since 2008. The influence of four different horizontal and vertical catchments delineation on runoff simulations was analyzed. The simulations were performed in two two-year periods 11/2008-10/2010 and 11/2010-10/2012. The attention was mainly aimed to snowmelt component of the model, for which temperature index method was chosen. The results of simulations were compared with water stages data measured in catchments outlets and with data from winter field measurements (snow depth and snow water equivalent). The results from both catchments showed that higher accuracy of simulation of the snow water equivalent was reached by dividing the catchments into more elevation zones. However, each of the catchments behaved in different way. The...
Modelling runoff processes in experimental Bystřice River catchmet in the Krušné Mountains
Hasa, Martin ; Jeníček, Michal (advisor) ; Šípek, Václav (referee)
This work deals with the modelling of runoff processes in the experimental Bystřice river catchment in the Krušné Mountains. Rainfall-runoff model WaSiM (Topmodel version) was used for this purpose.Objective of this study was modelling snow accumulation and snowmelt in winter periods 2009/2010 and 2010/2011. Sensitivity analysis of TOPMODEL parameters was performed using Monte Carlo and GLUE methodology. Wasim was calibrated manually for 25 and 250 m grid scales and daily timestep. Results of simulations in both spatial scales different spatial scales differed significantly. Better performance of modelling in finer scale wasn't proved in validation of the model. Results of the simulations pointed out uncertainty in model calibration. Rasters of modeled snow water equivalent were also analyzed in selected days representing periods of snow accumulation and snowmelt. The goal was to examine the functioning of used snow model (combination of temperature index method and energy balance method) within the WaSiM frame. Finer scale raster proved to be practical for this purpose It was found that the spatial heterogeneity in the distribution of snow is determined by evapotranspiration and also by effect of radiation correction (in the case of rainfall).Influence of interception and vegetation effects on...
Seasonal variability of soil parameters models
Šípek, Václav ; Tesař, Miroslav
Simulation of saturation of the soil profile in the small mountain river basins and testing of two seasonal sets of parameters.
Seasonal snow accumulation in the mid-latitude forested catchment
Šípek, Václav ; Tesař, Miroslav
The article deals with the snow cover characteristics (snow depth – SD and snow water equivalent - SWE) concerning the mid-latitude forested catchment. Namely, the influence of forest canopy (spruce and beech forest) and altitude (ranging from 835 m a.s.l. to 1118 m a.s.l.) was investigated. Forest cover was proved to have a significant influence on the snow cover accumulation, reducing the SWE by 48 % on average, compared to open sites. The elevation gradient concerning SWE ranged from 30 to 40 mm and from 5 to 20 mm per 100 m in open and forested sites, respectively. Its magnitude was found to be temporarily variable and positively related to total seasonal snowfall amount. The differences among interception losses, concerning various elevations and forest canopy, were not statistically significant.
Hodnocení vlivu klimatických změn na hydrologickou bilanci a návrh praktických opatření ke zmírnění jejich dopadů: Vliv klimatických změn na vodní režim povodí a půd, jeho modelování a návrh adaptačních opatření - systém včasného varování před náhlými povodněmi
Ústav pro hydrodynamiku AV ČR, Praha ; Česká geologická služba, Praha ; Šípek, Václav ; Němečková, Soňa ; Buchtele, Josef ; Šír, Miloslav ; Tesař, Miroslav
Předkládaná studie přináší popis sofistikovaného lokálního varovného systému (LVS) vybudovaného za použití nejnovějších poznatků o hydrodynamických mechanismech tvorby přívalových odtoků. Metody včasné výstrahy vycházejí z nových poznatků o hydromechanických mechanismech tvorby odtoku z malých povodí. Jsou podrobně popsány jednotlivé rizikové faktory a metody jejich detekce.
Statistical transformation of the precipitation data from regional climatic model to particular conditions of the Malse river basin
Hnilica, Jan ; Šípek, Václav
Paper describes procedure of statistical adaptation of the raw large-scale climate model data based on transformation between cumulative distribution functions of the model and real datasets. We developed two alternative ways and we validated those using data from Malse river basin.

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2 Šípek, Vojtěch