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Botanical survey of the Jedlový potok stream (Šumava National Park) three years after a hydrological restoration
ČERMÁKOVÁ, Monika
The Jedlový potok is situated in the Šumava National Park and it is a part of the Hornovltavský luh wetland komplex. In the 1950s, due to peat extraction, the stream was regulated and it drained the surrounding area including its floodplain. After a project creation and approval, part of the stream bed was restored, in 2015. Since then four ambient habitats have been monitored annually. Two permanent plots were set on each of them. The aim of the thesis was to record flora and vegetation on these plots in the fourth year after its restoration. Two types of habitats are located in a close vicinity of the stream bed. These are species-rich wet Cirsium meadow and dense vegetation of Phalaris arundinacea marsh with a dominant species Phalaris arundinacea. The other two habitats have a peaty character and they are located out of the riparian zone, further away from the stream. These are short-sedge fen and species-poor Eriophorum vaginatum mire. The used methods included fytocenologic relevés and also groundwater level measurement. In the whole area a total of 83 plant species were identified. The data of this thesis, also with other acquired data from the Jedlový potok area, are useful for further tracking of the vegetation development and also aids to find out if the restoration helped to recover the hydrologic connection between the stream and its surroundings.
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Potential of watercourses restoration measures as a tool for water retention in the floodplain
Zelíková, Nikol ; Matoušková, Milada (advisor) ; Jeníček, Michal (referee)
The object of this thesis is the evaluation of the restoration potential of small hydraulic structures for increasing water retention in river floodplain by using 2D HEC-RAS hydraulic model. A former millrace of the Rožnovská Bečva River was used for the design of restoration measures. The restoration proposal consists of partial modification of the current millrace and new close-to-nature watercourse in the agricultural floodplain. Restoration proposal also includes changes in land use, which consist of grassing and afforestation. The input data used for the hydraulic model are digital terrain model (5G) by ČÚZK, surface roughness parameter and mean hourly discharge data of 1997 (Q100) and 2007 (Q5) flood events provided by CHMI. The results of the hydraulic simulations point to the positive effect of proposed restoration measures especially in the change of flooded volumes (3x higher) and flooded areas (2x higher). The results indicate that restoration measures lead to the flooding from the newly designed watercourse that precedes the flooding from the Rožnovská Bečva River. This brings the possibility of more frequent occurrence of inundation events favourable for water retention in the river floodplain. Keywords: retention, floodplain, restoration, hydraulic structures, Rožnovská Bečva River,...
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Botanical survey of a restored segment of the Jedlový stream (Šumava National Park)
PADRTOVÁ, Markéta
The Jedlový Potok is a tributary of the Teplá Vltava River and is situated in the Upper Vltava Floodplain in the Šumava National Park. Part of the Jedlový Potok has been restored in 2015. The aim of the thesis was to record the flora on permanent plots in the Jedlový potok floodplain in the third year after its restoration. Four type of habitats were distinguished in the Jedlový potok floodplain. An extensively mown wet Cirsium meadow and Phalaris arundinacea marsh occurred in the riparian zone with a more fluctuating water table while a short-sedge fen and an Eriophorum vaginatum mire formed a peatland zone further away from the watercourse. Phytosociological relevés were recorded and groundwater table level was measured on two permanent plots within each habitat. Eighty plant species were recorded on the permanent plots. A total of 124 vascular plants was identified in the whole area of interest in the Jedlový Potok floodplain, 17 endangered species included. The botanical survey confirmed the spatial pattern of biotopes typical in the Teplá Vltava River floodplain and a high richness of the floodplain flora.
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Obnova vegetace revitalizovaného úseku řeky Stropnice
HEROVÁ, Zdenka
Three seasons of initial succession were followed in the frame of this thesis after a restoration project in a section of the Stropnice River and its floodplain. The succession tends towards formation of community of alluvial meadows, which is prevailing biotope in the neighborhood of the restored part. Strong factor influencing the course of succession is wetness of the substrate, which is partially given by distance of a site from the water-course and by the difference in the altitude of a site and of the river water table. Synantrophic species were most abundant in the first year (2014), followed by meadow and wetland species (2015, 2016).
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Comparison of proposed measures in Brantice–Kostelec section of river Opava
Korálová, Nikola ; Švancara, Jiří (referee) ; Zachoval, Zbyněk (advisor)
Diploma thesis deals with comparison of flow influenced by proposed measures with current status in Brantice-Kostelec section of the river Opava. The results of two-dimensional numerical model of steady uniform flow were used to assess the flow. The models were created using SMS – FESWMS for both of conditions. Thesis contains description of current status, design status, the theory of numerical modelling, comparison of the flow and evaluation of results.
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Impact of stream and floodplain modification on th eflood effects on the example of Stropnice basin
Douděrová, Šárka ; Langhammer, Jakub (advisor) ; Matoušková, Milada (referee)
This thesis deals with the evaluation impact of the modifications of floodplain and river network to the course and consequences of floods on the example of Stropnice river, located in South Bohemia. The thesis evaluate causes, course and effects of the floods, that took place in the basin with special focus to the recent floods. The basin was hit by extreme flood in 2002, while in 2005, 2006, 2009 other floods with different origin and magnitude took place in the basin. The assessment was based on field survey, and application of GIS analysis of results for identification of critical stream segments, which may influence the course of flood events. To get information about river network modification the HEMF field survey methodology was used. The following rivers were mapped: Stropnice river, Svinenský, Klenský and Žárský brook. The critical stream segments are spread in the whole Stropnice basin. It can be concluded that the anthropogenic effects are apparent in the whole basin including its headwater part in mountains. In several critical stream segments there were proposed measures aimed to reduce the consequences of potential flood events.
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