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Concept of stream restoration in urban area
Jonáš, Miroslav ; Matoušková, Milada (advisor) ; Šobr, Miroslav (referee)
This diploma thesis presents a restoration study of a small watercourse in the urban area, specifically the section of Bouřlivec - a tributary of the Bílina River, crossing the municipality of the village Lahošť. The restoration study was carried out as a part of the contract research of the Faculty of Science, Charles University in Prague and Povodí Ohře, state enterprise. The final report of this research is part of the cited literature at the end of the qualification thesis. Among the main objectives of the study was the design of restoration concept that will primarily lead to: 1) improving the hydromorphological and ecological state of the stream, 2) increasing flood protection and 3) increasing recreational usability in close proximity to the watercourse. A total of 11 cross section profiles within a longitudinal profile with a length of approx. 454 m were geodetically measured using the total geodetic station. A modification of the new method of calculating the roughness of cross section profiles was proposed and for each profile the current and design maximum flow capacities were calculated. As part of the longitudinal profile, a mosaic of 4 variant solutions was designed, which alternate regularly within the section of interest. The grain size analysis of the river substrate was held in...
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Hydromorphological survey as a basis for restoration measures of streams in urban areas
Jonáš, Miroslav ; Matoušková, Milada (advisor) ; Šobr, Miroslav (referee)
This thesis deals with hydromorphological survey using the HEM methodology (Langhammer, Hartvich 2014) and its application to the backbone streams of the Bouřlivec catchment. The aim is to determine the extent of anthropogenic modifications on these streams and their subsequent classification according to the corresponding classes of hydromorphological quality. In summary, 28,107 km of watercourses were mapped by field monitoring, which were divided into 101 morphologically unique sections. Each section was assigned a hydromorphological quality class according to the calculated hydromorphological status. In only 4,28 % of these sections, a state close to nature was stated. The remaining 95,72 % of sections show signs of anthropogenic modifications, which are evident especially in sections intersecting urban areas of towns and municipalities. The highest rate of anthropogenic modifications was identified in a total of 1,02 % of sections, which were assigned the worst class of hydromorphological quality. The sections that can be assessed as significantly modified make up to 18,24 % of the mapped area and the moderately modified sections cover 29,57 % of the area of interest. The final comparison of the two investigated streams clearly shows that the Loučenský brook significantly exceeds Bouřlivec,...
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