Extension to design guidelines for bedload transport 2019
Abstract
Knowledge of bedload transport is paramount for process understanding, planning and implementation of preventive measures, delineation of risk areas and the analysis and assessment of flood events. In order to calculate bedload transport a large number of empirical equations is available, which differ strongly in their scope of applicability and which are characterized by a large bandwidth of results. In order to facilitate the standardized application of bedload transport equations (including equation sets for calculating flow hydrodynamics and the motion threshold of grains) in the year 2016 a guideline was developed at the University of Natural Resources and Life Sciences, Vienna, which besides a written guideline also contains a computer tool for the practical application within the WLV (Austrian Torrent and Avalanche Control). This guideline was extended in the scope of further projects in the years 2017 and 2018. During the application-oriented use of this guideline it was found that the limits of the usually applied equation for the calculation of channel hydrodynamics after Strickler (1923) are frequently exceeded in steep-sloped channels. Hence the resulting values for flow velocity and water depth are potentially erroneous. Besides the equation mentioned there exist different approaches for the calculation of channel hydrodynamics in these cases, such as Smart & Jäggi (1983) as well as Rickenmann & Recking (2011). The main research questions within the project are: How good fit the flow equations to actually measured data? Which of the three equations provides the best fit? Which reasons can exist that lead to a better or worse agreement with field data? In case of larger discrepancies: What would be necessary in order to achieve a general improvement of the equations?
keywords Bedload transport Hydrodynamics
Publikationen
Project staff
Michael Tritthart
Assoc. Prof. Priv.-Doz. Dipl.-Ing. Dr.techn. Michael Tritthart
michael.tritthart@boku.ac.at
Tel: +43 1 47654-81910
Project Leader
01.09.2019 - 30.04.2020