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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Hydromorphology as a component part of ecological condition of water bodies
 Kujanová, Kateřina ; Matoušková, Milada (advisor) ; Lehotský, Milan (referee) ; Pokorný, Jan (referee)
Today, the study of fluvial-morphological processes is focused on evaluating hydromorfological status of streams and on proposing restoration measures. A fundamental prerequisite for assessing the current hydromorphological status of streams is establishing reference conditions for each stream type that serve as a benchmark and represent the target status after restoration. The aim of this thesis is to describe type-specific hydromorphological reference conditions for rivers on the territory of the Czech Republic with the help of determining river types, developing the REFCON method for establishing reference sites and recording characteristics of reference status. The approach to establishing reference sites is based on meeting the criteria of having minimal anthropogenic impact that are first assessed using cartographic data and subsequently verified through field survey. Parameters - altitude, sinuosity, and valley floor slope - for classifying river reaches into types were determined on the basis of the results of statistical methods applied on 3197 river reaches covering the whole territory of the Czech Republic. The classification of river reaches into 9 river types was verified through field survey at 44 sites. Detailed field survey and measurements of characteristics of natural channel...
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Hydromorphological assessment of rivers using distance data sources
 Králová, Magdalena ; Matoušková, Milada (advisor) ; Hais, Martin (referee) ; Lehotský, Milan (referee)
The thesis is aimed on hydromorphological assessment with usage of distance data. The distance method QuaWaDis is defined and the usage of results of image processing within the hydromorphological assessment is considered. The aim of the assessment is classification of hydromorphological conditions of water bodies according to Water Framework Directive 2000/60/EC. Distance method is based on visual interpretation of public data. Image processing results can extend the number of parameters of the distance method - object based classification was applied on aerial imagery (in land cover classification), unsupervised classification and image reclassification was applied on multispectral satellite data (in water depths classification). The calibration of distance method and the credibility of the distance data was evaluated in comparison with results of field survey EcoRivHab (Matoušková, 2008). Object based image processing was aimed on accuracy assessment, index of efficiency was defined and the concept of fuzzy logic was applied in accuracy assessment. From consideration of classification efficiency is obvious, that large internally heterogeneous objecs is more effectivelly to vectorise manually. Accuracy assessment with usage of concept of fuzzy logic shows the success of object recognition within each...
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