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Gewählte Master / Diploma Thesis:

David Leitner (2016): Monitoring der sedimentologischen Entwicklung der Donausohle nach Zugabe gröberer Kornfraktionen mittels unterschiedlicher Zugabevarianten.
Master / Diploma Thesis - Institut für Wasserwirtschaft, Hydrologie und konstruktiven Wasserbau (IWHW), BOKU-Universität für Bodenkultur, pp 172. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The continuous riverbed erosion at the Danube to the east of Vienna has hardly predictable effects on nature, mankind and economy. These are the driving forces for finding solutions to slow down or to stop incision entirely. As a part of the ''Integrative River Engineering Project on the Danube to the east of Vienna'' a mix of measures has been selected and has now been tested within the ''pilot project Bad Deutsch-Altenburg'' on one of the last free flowing sections of the Danube. One of these measures called the ''granulometric bed improvement (GBI)'' has for the first time been checked for its effectiveness within this 1:1 model in nature. In the course of the measure GBI gravel within the natural grainsize spectrum is added to the river bed, which is coarser than the mean diameter within this area. The aim of the GBI is the stabilization of the river bed without stopping the bedload transport entirely. Within this work, a methodology was developed to provide an objective evidence of the GBI material in the course of the monitoring program of the ''pilot project Bad Deutsch-Altenburg''. The specially developed method is based on the comparison of a specific value which is calculated from the grain size distribution for each bed sample. This calculated value is a proportional value of a defined grain size spectrum. As proof of the existence of GBI material serves the comparison between the proportional values of bed samples before and after addition of GBI material. Using this method, it becomes possible to mathematically determine the presence of GBI material. Additionally probes obtained by freeze core sampling were subjected to a visual assessment. Finally the methodology was used for the evaluation of various volumetric and freeze core samples taken within the accompanying monitoring. Hence the described method was tested for usability.

Beurteilende(r): Habersack Helmut
1.Mitwirkender: Liedermann Marcel Georg

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