National Repository of Grey Literature 81 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
Analysis and dynamics of the fluvila system of the Roklanský and Javoří brook
Skrčená, Lucie ; Kliment, Zdeněk (advisor) ; Langhammer, Jakub (referee)
This thesis is focused on fluvial dynamics in gravel bed mountain stream. As model basin was chosen Roklanský brook catchment in Šumava mountains, some methods was used on a part of its tributary Javoří brook. We wanted to make an analysis of Roklanský brook catchment by characteristics and course of channel, river floodplain and fluvial erosion and accumulation forms, to find context and factors natural and anthropogenic influenced character and dynamics of the fluvial system. There were used methods based on field mapping channels and fluvial forms, grain size distribution, lidar data, historical aerial photos by 1949 to 2015, bankfull discharge and study old maps and other historical documents from archives. The results show that fluvial system of Roklanský brook has high rate of dynamics. We get known that placement of accumulation and erosion forms relates with longitudinal slope of channel and geological forms. The train of channel changes often, in past according to anthropogenic intervention. In floodplain of Javoří brook is a lot of potential channels. We get known height of water level which causes significant channel changes. Key words: gravel bed streams, fluvial dynamics, field mapping, historical aerial photos, lidar data, bankfull discharge, historical maps, Šumava mountains,...
Channel dynamics of the restored Sviňovický Brook
Hujslová, Jana ; Kliment, Zdeněk (advisor) ; Šobr, Miroslav (referee)
The aim of this thesis was to monitor and to evaluate development and morphological dynamics of the Sviňovický Brook channel after the restoration in 2005. Field surveying and aerial images by low-flying model planes were used to detect recent channel dynamics after the restoration in 2005. Channel changes were compared to water level measurements. The additional method was grain size analysis of bed sediments. Orthoimage and cadastral maps were utilized to document changes in channel position over the past 160 years. Field surveying detected intensive bed and bank erosion in restored channel caused by high stream velocity from the fortified upper flow. The restored channel has markedly widened and deepened. The largest changes occurred during floods in July 2006. The intensive eroding- depositing processes remodeled the channel. The changes in channel bed level were up 30 cm and bank erosion locally exceeded 1 meter. The longitudinal profile of the channel was leveled. The road bridge began to be obstacle to the longitudinal profile development. It causes deposition upstream and erosion downstream. The largest bank disruptions in the sector up the road bridge were fortified by quarried stones at the end of 2007. The channel has not shown any significant changes since 2007. With the growing density...
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)
Variability of hydropedological characteristics of soil type in the catchment of Tetřívčí brook
Kozáková, Jana ; Kliment, Zdeněk (advisor) ; Šefrna, Luděk (referee)
This thesis deals with the evaluation of hydrological properties variability of soils in forest catchment Tetřívčí brook in the source area Blanice based on selected hydropedological characteristics with respect to soil type, vegetation cover and character of slope. The selected hydropedological characteristics are maximum capillary water capacity, full water capacity, soil infiltration capability - infiltration rate and cumulative infiltration and retention potential of soils. In sum of seven soil subtypes found in forest (coniferous, deciduous and mixed) and meadow (cut and non-maintained) and on the different slope (three categories) were studied in the catchment area. This thesis is built on bachelor thesis, which dealt with the variability of hydropedological characteristics in the experimental pair comparison basins of Tetřívčí and Zbytinský brook. In the thesis were used mainly the measured data obtained from repeated field campaigns in pre- selected sites and data from the database of experimental catchments of Zbytiny. In the selected sites were made soil probes, soil samples were taken using Kopecky cylinders and infiltration measured by a single-cylinder infiltrometer. By laboratory determination and calculation, selected hydropedological characteristics were obtained. The results were...
Runoff Changes in the Šumava/Bohemian Forest Region
Fiala, Ondřej ; Kliment, Zdeněk (advisor) ; Královec, Václav (referee)
RUNOFF CHANGES IN THE ŠUMAVA / BOHEMIAN FOREST REGION Abstract: The goal of this thesis is to the evaluation of possible causes of changes in runoff regime in the Šumava region from time and spacial point of view. The thesis includes research and applied part. The research part is dedicated to methods of evaluation of runoff changes and their possible causes in teh Šumava region such as anthropogenic factors (changes in the river network, dams, drainage, land - use changes), natural factors (climate changes, peatbogs influence) and disturbances (wind calamities and bark beetle outbreaks, floods). In the applied part there is an analysis of precipitaion - runoff regime for long-term time series of average annual, monthly and minimal daily discharges and monthly precipitations for selected gauging stations in upper Otava, Ostružná, Volyňka, upper Blanice and Teplá Vltava basins using simple and double mass curves and Mann - Kendall test. In conclusion the achieved results were evaluated, discussed and compared with subject publications. Key words: disturbance, Mann - Kendall test, runoff, discharge, mass curves, precipitation, Šumava, changes
The analysis of river network evolution in Ethiopian Highland
Maca, Vít ; Vilímek, Vít (advisor) ; Kliment, Zdeněk (referee)
Ethiopian highlands is one of the most various tectonic areas in the world. It lies in close proximity to Ethiopian rift system in areas with volcanic landscape. As the main factors involved in development of river networks have been identified: volcanism, tectonics, erosion. The most important factor is the erosion, that work pays closer. Using the methods of remote sensing, GIS analysis and documenting the longitudinal and transverse river profiles were surveyed area of differentiation in the types of river networks, deep of river valleys, geological strata, etc. GIS and remote sensing analysis provided more supporting data. Crucial is the analysis of the longitudinal profiles. Five rivers was profiled: Guder, Muger, Jemma, Birr, Blue Nile. Knickpoints in profiles were identified and were divided into three types according to the majority factor involved in the formation: Active uplift entire Ethiopian highlands which activizate river erosion, active uplift smaller areas, lithological. Crucial for next outputs are knickpoints linked to active uplift entire Ethiopian Highland. Lokalization of thats, were profiles divided into subprofiles, representing phasis of erosion development of entire area. During the past 31 million years, were identified 3 phases with increasing incision rates. Furthermore,...
Changes of rainfall-runoff conditions in the Upper Opava River basin
Královec, Václav ; Kliment, Zdeněk (advisor) ; Ledvinka, Ondřej (referee)
The rainfall-runoff process is a natural event affecting a landscape. There are many factors which make that process difficult to understand. The factors are closely connected and so we have to think about the wide-contexts between them. This thesis pays attention to the variation of rainfall-runoff conditions in the Opava and Opavice river basin down to the gauging station Krnov. In the last 50 years there are observed partly the influences of climate oscillations and changes in the rainfall-runoff process and partly the potential human influence. This thesis is also solving the question of testing the homogeneity of the time series. Some statistical tests, which were already used in other projects, were used for that. On the basis of time series analysis of rainfall, air temperature and snow cover is endeavoured to analyse the changes and to establish significant trends in each climate features. On the top of that there is made the analysis of land use changes and land drainage analysis, which is the complement of climate change analysis. Powered by TCPDF (www.tcpdf.org)
Morphology of the Křížový potok river channel in the Eastern Krkonoše Mountains
Dvořáková, Magdalena ; Engel, Zbyněk (advisor) ; Kliment, Zdeněk (referee)
This master thesis deals with the morphology of mountain river channels - with structures, patterns and shapes resulting from fluvial processes. The findings are documented on the Křížový potok river channel in the Eastern Krkonoše mountains. There are several specifics which influence the evolution of mountain river channels. The first one is high elevation change and big slope of the river, which determinate the formation of typical structures, such as waterfalls, cascades and steps, often related with pools. Plane bed, riffle-pool and dune-ripple also represent typical structures of mountain river channels. Specific microstructures are represented by potholes. River channels in forested mountain basins are affected by logs and wood debris, which create local barriers where fine-grained material accumulates. In the Křížový potok river channel, a high diversity of the channel structures can be seen. The most common structures are step-pools and cascades. The stream is influenced by large accumulation of delluvial sediments and wood debris which create obstacles to the flow.
Evaluation of rainfall-runoff regime in the headstream area of the Blanice River with regard to major events
Kodádková, Iveta ; Kliment, Zdeněk (advisor) ; Královec, Václav (referee)
Evaluation of rainfall-runoff regime in the headstream area of the Blanice River with regard to major events ABSTRACT The bachelor thesis provides an understanding of the rainfall-runoff conditoins in the upper basin of the South Bohemian river Blanice focusing on the flood situation. It deals with the evaluation of significant rainfall-runoff episodes in the basin in terms of their frequency, seasonality and weather causal situation. The analysis used data from the Czech Hydrometeorological Institute for profile Blanický mlýn for the years 1952 to 2009. Attention is also paid to physical-geographical conditions and their possible influence on the occurrence of flood situations. Described in detail was a flood in late June and July 2009. Keywords: rainfall-runoff conditions, floods, Blanice

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