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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic A: Advances in the Fundamentals of Water Science and Engineering : Reviewing mobile bed tests from the conceptual design to the interpretation of results.
Reviewing mobile bed tests from the conceptual design to the interpretation of results.
Author : Sánchez-Arcilla, A.; Cáceres, I.; Van Rijn, L.; Grüne, J.
Mobile bed tests are a useful tool for hydraulics and sediment transport since many of the underlying processes (for example incipient motion or sediment re-suspension) are still poorly known. Mobile bed tests reproduce sediment dynamics occurring in the field under controlled “drivers” and a reduced scale. The reduction in scale is normally different for vertical and horizontal dimensions while the larger scale tests are commonly carried out in 2DV wave flumes which only reproduce conditions for an alongshore uniform beach. The coupling between fluid motion, sediment fluxes and the resulting bed evolution, which are continuously interacting, are still far from been well understood, which highlights the need for more fundamental knowledge and observations under controlled conditions. These reduced scale laboratory tests are normally supplemented by numerical simulations, field observations and even the semi-empirical rules and criteria used in morpho-dynamics and coastal engineering. Physical modelling within a set of laboratory facilities presents a number of options which should be carefully considered before deciding on which is the most suitable type of tests for the objectives of the work. The design of the experiments can also be at large scale, with a limited distortion, or at a reduced scale where the scale effects may lead to important differences with respect to the prototype (Nature). Due attention should be paid to the resolution and accuracy we desire from the performed experiments. Research oriented tests normally require high resolution and accuracy and an over dimensioning of the observational equipment to be deployed. Experiments aiming at solving more practically an engineering problem may be performed with a smaller number of instruments and tests. This paper will review the basis of mobile-bed tests and how to approach the design of a reduced-scale physical model. Next we shall consider the execution of experiments and the associated interpretation of results. This will be followed by some conclusions, derived from the on-going work performed within the SANDS-Hydralab project (see the web page of “http://www.hydralab.eu/sands” for further information).
File Size : 280,489 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic A: Advances in the Fundamentals of Water Science and Engineering
Date Published : 09/08/2009
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