|
|
Quantification of natural water retention capacity in selected watersheds
Pavlík, František ; Švihla,, Vladimír (referee) ; Pavelková,, Renata (referee) ; Dumbrovský, Miroslav (advisor)
The aim of this work is to quantify the natural water retention capacity of the landscape in selected catchments and determine the significance of selected climatic and geographic basin factors on components of retention capacity. 18 rainfall-runoff events were selected in 11 catchments for quantification of the natural water retention capacity of landscape. Land cover, geomorphological, pedological and hydrological conditions were analyzed for this basin using GIS tools. Historical rainfall-runoff events for which were restored historical land cover were also evaluated in this work. Two different methods were used for the quantification of retention capacity, one of them was used in two variants. A rainfall-runoff models and simulated scenarios of land cover (positive and negative) were constructed in two selected catchments in HEC-HMS. The work also use previously performed simulation scenarios of land cover formulated by other authors. Total final set of 33 rainfall-runoff events were subjected to statistical correlation and regression analysis. The goal of these analyses was to determine the significance of individual parameters assessed in relation to the components of natural water retention of catchment.
|
|
|
The influence of forest on the occurrence of N-year flows in the basin
Doleželová, Hana ; Zemanová, Šárka (referee) ; Kozel, Tomáš (advisor)
The thesis deals with the influence of forest on n-year flows in the catchment near Staré Město pod Landštejnem. The aim of the thesis was to perform a schematization of the selected catchment and to determine the necessary parameters for the selected method, with the help of which the simulation of the rainfall-runoff process was carried out. The simulations were carried out on selected episodes during which the forest characteristics changed due to deforestation. Furthermore, simulations were performed in which the forest vegetation was changed to fields and meadows. Variants where RAIN-6H was used were also simulated. The model was built in the HEC-HMS program, in which the SCS Curve Number, SCS Unit Hydrograph and Muskingum methods were selected for the calculation. In the conclusion of the thesis, the model building and the course of the simulated episodes are summarized. Furthermore, the water retention capacity of the area of interest is evaluated.
|
|
|
Assessment of torrential flood susceptibility for chosen profile
Doleželová, Hana ; BBA, Šárka Zemanová, (referee) ; Kozel, Tomáš (advisor)
The bachelor thesis deals with the course of flash floods in the Oslava and Oskava river basins. The aim of the bachelor thesis was to create a rainfall-runoff model, calibrate it on selected episodes and then evaluate it on validation episodes. Another goal was also to determine the probable behaviour during flash flood occurrence in the area. The model was created in the HEC-HMS program, in which the SCS Curve Number, SCS Unit Hydrograph and Lag methods were selected for the calculation. In the conclusion of the bachelor thesis, the developed model and the course of the simulated episodes are summarized. The suitability of the selected computational methods is also evaluated.
|
|
|
Rainfall Runoff Model of the Kotojedka River Basin
Černá, Daniela ; Starý, Miloš (referee) ; Marton, Daniel (advisor)
The bachelor’s thesis deals with the modeling of the rainfall-runoff process in the Kotojedka river basin. Since there is no continuous hydrological measurements in the catchment, the main task was to develop a hydrological model using the HEC HMS software and then validate it using the additional calculation of the design flood hydrograph according to A. Čerkašin method. Moreover, a N-year return period flood hydrographs were derived, which can be used as a basis for flood protection measures planning in the river basin area and in the adjacent cadastral area of the Kroměříž city. The creation and simulation of the hydrological model were carried out for several model settings, respectively different methods for the calculation of hydrologic and hydraulic transformation of the water flow in the river network were tested and subsequently compared with each other.
|
|
|
Assessment of torrential flood susceptibility for chosen profile
Doleželová, Hana ; BBA, Šárka Zemanová, (referee) ; Kozel, Tomáš (advisor)
The bachelor thesis deals with the course of flash floods in the Oslava and Oskava river basins. The aim of the bachelor thesis was to create a rainfall-runoff model, calibrate it on selected episodes and then evaluate it on validation episodes. Another goal was also to determine the probable behaviour during flash flood occurrence in the area. The model was created in the HEC-HMS program, in which the SCS Curve Number, SCS Unit Hydrograph and Lag methods were selected for the calculation. In the conclusion of the bachelor thesis, the developed model and the course of the simulated episodes are summarized. The suitability of the selected computational methods is also evaluated.
|
|
|
Application of degree-day accumulation and snowmelt model in the Ptačí Brook basin
Beitlerová, Hana ; Jeníček, Michal (advisor) ; Pavlásek, Jiří (referee)
Snow accumulation and snowmelt research is one of the most important hydrological issues in mountain areas World-wide. Spring snowmelt, usually in the combination with intensive rainfall or high air temperature, is one of the most common causes of flooding in the Czech Republic. Mathematical modeling of hydrological processes belongs to effective instruments of flood protection and finds its use in a variety of areas. For example, water management, hydrological forecasts for agriculture, information for dam regulation or for recreational areas and water sports are all affected. This thesis focuses on snow accumulation and snowmelt modeling with use of the empirical Degree-day method. This method is based on the relationship between snowmelt rate and air temperature. The American HAC-HMS programme is used for the simulation of hydrological processes. The main goal of this thesis is to calibrate the model and to simulate snow accumulation, snowmelt and run-off from the watershed. The experimental basin 'Ptačí potok' is situated in the central part of the Šumava Mountains, in altitude of about 1,200 m. Two winter seasons, 2011 and 2012, were simulated. Simulations showed high reliability and correct calibration of the Temperature index snowmelt model. Simulations of the snow water equivalent evolution...
|
|
|
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...
|
|
|
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...
|
|
|
Lumped Water Balance Rainfall-Runoff Model Within a Daily Computational Time Step
Bednář, Martin ; Marton, Daniel
This paper aims to show the developed software representing a lumped water balance rainfall-runoff hydrological model. The software allows the user to create a simulation model of the rainfall-runoff process in any catchment for which the user can provide the necessary measured climatological and hydrological data. The calibrated model then can be used to predict runoff from the catchment based on the predicted input data, allowing for some analysis of the impact of climate change on hydrological conditions in the landscape. The model is developed and tested on a part of the Thaya river catchment, the part above the Vranov reservoir.
|
|
|
Runoff modeling using SCS CN and Green Ampt methods in ostrovká Bystřice river catchment in Ore Mountains
Duben, Jan ; Jeníček, Michal (advisor) ; Vlček, Lukáš (referee)
This thesis applies the runoff process in ostrovská Bystřice river catchment in Ore Mountains. For this purpose we used runoff precipitation model HEC-HMS. Our specific goal is to model the soil runoff, which is observed on eleven runoff precipitation events in the period 2009 - 2013. We analyzed basic physical characteristics of soils, which occur in observed river basin. The results were afterwards used to set up parameters of studied methods. We found out, that the moisture from antecedent precipitation influences modeling of soil runoff. The antecedent precipitation conditions the change of basic physical characteristic. We disregarded the influence of evapotranspiration and effect of vegetation on soil runoff. For the parameterization we have chosen two methods, which describe soil runoff. It was SCS CN and Green Ampt methods. These two methods have been compared on sample of resulting events. The methods were manually and automatically calibrating. The results showed on the insignificant difference between both observed methods. No better significant predicative capacity was manifested for one or other methods. Key worlds: soil runoff modeling, SCS CN, Green Ampt, HEC-HMS, infiltration
|
guest ::
