A5086541877- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Hydraulic flow and structures
- Fish Ecology and Management Studies
- Manufacturing Process and Optimization
- Business Process Modeling and Analysis
- Systems Engineering Methodologies and Applications
- Semantic Web and Ontologies
- Advanced Software Engineering Methodologies
- Fluid Dynamics and Turbulent Flows
- Advanced Database Systems and Queries
- Aquatic and Environmental Studies
- Technology Assessment and Management
- Aquatic Invertebrate Ecology and Behavior
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Evacuation and Crowd Dynamics
- Design Education and Practice
- Aerodynamics and Fluid Dynamics Research
- Open Source Software Innovations
- Freshwater macroinvertebrate diversity and ecology
- Fluid Dynamics and Vibration Analysis
- Digital Platforms and Economics
BOKU University
2013-2024
Bundesamt für Wasserwirtschaft
2016-2024
Industrieanlagen Betriebsgesellschaft (Germany)
2016
Bauhaus Luftfahrt
2009-2012
SRON Netherlands Institute for Space Research
1993
Previous studies on plastic pollution of aquatic ecosystems focused the world's oceans. Large rivers as major pathways for land-based litter, has received less attention so far. Here we report quantities in Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean abundance (n = 17,349; ± S.D: 316.8 4664.6 items per 1000 m(-3)) and mass (4.8 24.2 g river to be higher than those drifting larval fish 24,049; 275.3 745.0 individuals. m(-3) 3.2 8.6 m(-3))....
Zusammenfassung Buhnen werden im Wasserbau vielfach angewendet und sind aufgrund der komplexen Strömungsverhältnisse in Abhängigkeit von Wasserstand Buhnengeometrie herausfordernd bezüglich Wirksamkeit Eignung als flussbauliche Maßnahme. Physikalische Modellierungen seit etwa 130 Jahren angewendet, bei Bedarf mit Feldmessungen mittlerweile auch numerischen Modellen kombiniert, wodurch unter anderem die Bewertung profitiert. Aufgrund Skalierung physikalischen kann es jedoch zu...
Climate change is leading to alterations in low-flow conditions and droughts, while societal factors like urbanization are intensifying these challenges. This underscores the urgent need for a deeper understanding more effective management of water shortages Danube main stream. Innovative modelling tools addressing demand able assess allocation between relevant demands including agriculture, industry, hydropower, ecology navigation during low flow periods. The STARS4WATER project deals with...
Abstract The dispersal patterns of marked larvae the nase carp (Chondrostoma nasus L.) were observed alongside dissimilar shoreline configurations in main channel free-flowing Austrian Danube and compared with those floating particles to investigate mode (active–passive). Individuals different larval stages floats at similar densities released an artificial rip-rap groynes a rehabilitated gravel bar. In both habitats, individuals recaptured during sampling period 4 d after release. Relevant...
We investigated the mode (active versus passive) of larval downstream dispersal and its influencing factors in nase carp (Chondrostoma nasus). Marked larvae (early later stages), together with equivalent numbers passive particles, were released main channel River Danube (Austria) at different flow (low, high) current (over-critical, under-critical) conditions. Larvae particles recaptured stationary nets varying distances from release. assumed that differences spatial patterns between due to...
Racetrack flumes are established experimental settings in ecohydraulics and sediment studies. Their results often coupled with numerical simulations. The two-equation turbulence closures of the Reynolds-Averaged Navier-Stokes equations applied widely such engineering applications. They preferred for their ease use low computational costs compared more sophisticated models involving large-scale fluvial Here, three variants models, i.e. standard k-ϵ model two k-ω were to tackle mean flow a...
As is widely known, the groyne layout affects three-dimensional flow situation and sediment budget in fields. Lack of knowledge exists concerning evolution hydrodynamics morphodynamics main channel rivers due to distinct layouts. Accordingly, sensitivity stream river bed fairway geometry were investigated with help a hydrodynamic model transport by considering eight variants seven discharges straight reach River Danube. The variation crest elevation length indicated highest sensitivity,...
The dispersal of fish larvae in rivers might result from water movement but also larval behaviour. Although potentially crucial for dispersion, knowledge the role behaviour is still fragmentary. This study intends to contribute question how riverine drift or move. All dispersal-relevant patterns a characteristic rheophilic species were analyzed based on parameters (i) swimming activity, (ii) direction movement, and (iii) orientation towards current vector. Experiments conducted novel flume...
Using a multi-disciplinary optimization (MDO) approach to aircraft design introduces computational and organizational challenges an process. This paper presents open source software tool for conceptual called Conceptual Design Tool (CDT). CDT is developed as part of the Open Source Concept Innovation (OSCI) project at Bauhaus Luftfahrt addresses some introduced by MDO design.
Recruitment of Chondrostoma nasus and similar fish species in rivers is related to spatiotemporal linkages between larval hatching nursery habitats. Active swimming behaviour contradicts the assumption that passive particle tracing models can serve as a proxy for dispersal models. A racetrack flume with an inshore area near-natural slope was created observe individual trajectories. new three-step, raster-based analysis developed distinguish four types movement patterns: active upstream,...
Die im Rahmen des Pilotprojektes Bad Deutsch-Altenburg an der Donau umgesetzten Maßnahmen wurden schon während Baumaßnahmen durch ein umfangreiches Monitoring bezüglich ihrer Funktionalität beleuchtet. So speziell Sohlgrundaufnahmen, Freeze-Core-Proben und Steintracer Erkenntnisse über die Wirksamkeit Maßnahme "granulometrische Sohlverbesserung" (GSV) gewonnen. Erste Auswirkungen Umbaumaßnahmen Bereich Niederwasserregulierung sowie Anbindung Johler Seitenarmes zeigten sich ebenfalls das...
The current challenges of the aviation industry call for development new and revolutionary aircraft concepts. In general, task developing is risky an extremely complex task, manufacturers seek to control this complexity by adopting evolutionary approach. Introducing ways controlling has potential benefit reducing risk associated with enabling aircraft. One such way based on application agile principles. This paper discusses principles processes eliminate a certain degree involved...
Zusammenfassung Numerische Modelle stellen ein wichtiges Werkzeug zur Analyse und Bewertung von Gewässerprozessen sowie flussbaulichen Maßnahmen dar. In den beiden Projekten DREAM SK-AT (Interreg V‑A Slowakei – Österreich) SEDDON II Österreich Ungarn) wurden Nutzungsansprüche bezüglich Wasserkraft, Hochwasser, Schifffahrt, Ökologie Trinkwasser analysiert anschließend mittels numerischer unter Zuhilfenahme Feldmessungen physikalischen Experimenten in Österreich, Ungarn untersucht. dieser...
In dieser Arbeit werden verschiedene Methoden zur numerischen Modellierung des Sedimenttransports basierend auf dreidimensionaler Hydrodynamik großen, mittleren und kleinen Skalenebenen erörtert deren Eignung für ingenieurmäßige Aufgabenstellungen anhand von konkreten Anwendungsfällen beleuchtet. Auf der großen Skalenebene kommt das BOKU-Sedimenttransportmodell iSed zum Einsatz, Lösung Strömungsgleichungen mittels Reynolds-Averaged-Navier-Stokes-Verfahrens (RANS) basiert. Als Anwendungsfall...
Zusammenfassung Kiesinseln können als naturbasierte Lösungen die ökologische Funktion von Gewässern verbessern und nachhaltig Habitate für aquatische terrestrische Lebewesen schaffen. Ihre Anwendung hydraulische Maßnahmen mit Auswirkungen auf Hydrodynamik Morphologie des Hauptstroms muss jedoch weiter untersucht werden. Ziel der vorliegenden Studie ist es, Eignung zur Niederwasserregulierung im Rahmen Schifffahrt zu bewerten. Zu diesem Zweck wurden verschiedene geometrische Variationen...
Abstract Connectivity of nurseries and spawning habitats for young the year life stage is essential successful recruitment fish populations therefore provides a key indicator river restoration measures. Models dispersal offer potential to draw conclusions regarding scenarios fill knowledge gaps about possible implications populations. A newly developed rheoreaction‐based correlated random walk model (RCRW), in combination with three‐dimensional numerical non‐steady‐state particle tracing...
Zusammenfassung Die Donau und die sie umgebende Landschaft liegen heute im Bereich verschiedener Interessen wie Hochwasserschutz, Wasserkraft, Schifffahrt Ökologie. Aufgrund dieser Tatsache ist das ehemals ungezähmte wilde Flusssystem seit Ende des 19. Jahrhunderts mit einer Vielzahl anthropogener Veränderungen konfrontiert, vielfältige hydromorphologische Auswirkungen zur Folge haben. Zusätzlich führen – trotz bereits umgesetzter Renaturierungsprojekte teilweise adaptiertem...
The conceptual development process is the joint effort of designers and future operators to elicit analyze requirements design a system which plausibly meets these requirements. A continuous build-up structured product model that explicitly interrelates its metrics desirable. However, modeling are usually conducted separately using different tools. Moreover, phases often separated in time, personnel, space. This practice leaves considerable number decisions untraceable. We address problems...