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Gewählte Master / Diploma Thesis:

Wolfgang Obruca (2015): Hydraulic and Sedimentological Assessment of Salmonid Spawning Habitats in River Sections influenced by Small Hydropower Operations.
Master / Diploma Thesis - Institut für Wasserwirtschaft, Hydrologie und konstruktiver Wasserbau (IWHW), BOKU-Universität für Bodenkultur, pp 100. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Salmonid rivers in Austria show a high degree of regulation as a result of the nationwide development of small hydropower plants (SHPs). Along with this development, hydromorphological and sedimentological alterations seen in river sections affected by hydropower operations are assumed to cause limitations in the availability and quality of the spawning habitat in salmonid fishes. However, to date, studies related to the suitability of hydropower influenced river sections for spawning salmonids are still rare. This master thesis, written as a compendium, deals with the hydraulic and sedimentological assessment of salmonid spawning habitats in hydropower influenced river sections. This thesis is organized into two sub-sections. Section 1 presents a literature review about the selection and abiotic quality criteria of the spawning habitat in riverine salmonid fishes. Consequently, the current state of hydropower development in Austria is reviewed and discussed with regard to potential negative ecological affects of hydropower operations on salmonid spawning habitats. Section 2 consists of two case studies composed as research articles, including a closing synthesis of the findings obtained regarding feasible management implications. Article 1 summarizes the findings obtained from a laboratory experiment dealing on the assessment of the intergravel flow through artificial brown trout spawning redds in a flume experiment. A method was conceived to visualize the intergravel flow in order to measure the intergravel flow at successive coarse sand infiltration of the spawning redds. Article 2 presents the results obtained from a field investigation at two geologically distinct study rivers (Gr. Mühl, Upper Austria; Gr. Erlauf, Lower Austria). The aim of this investigation was to analyze different sections of hydropower development regarding spawning redd abundances and abiotic spawning redd characteristics.

Beurteilende(r): Hauer Christoph

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