Print Email Facebook Twitter The feasibility of two-dimensional particle tracking velocimetry for the study of vertical sediment transport in a turbulent free surface flow Title The feasibility of two-dimensional particle tracking velocimetry for the study of vertical sediment transport in a turbulent free surface flow Author Adriaens, F. Van Rillaer, L. Contributor Battjes, J.A. (mentor) Booij, R. (mentor) Uijttewaal, W.S.J. (mentor) Zech, Y. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 1996-05-01 Abstract The objective of the present work is to see whether the transport of sediment in a turbulent free surface flow can be studied with a new method of video image analysis, called the Two-Dimensional Particle Tracking Velocimetry. A slice of a two-dimensional turbulent flow in a laboratory flume is illuminated and particles are injected. After the recording of the illuminated particles, the video images are digitised and a software package called DigImage is used to analyse them, in order to give for each image the number of particles and their two dimensional positions and velocities. Four parameters are varied in the experiments: the diameter of the particles, the depth-averaged flow velocity, the distance between the injection and the point of observation, and the height of the injection. An analysis is then carried out in order to see the influence of these parameters on the concentration profiles and on the particles velocities. This analysis compares the measurements and the model of suspension ofparticIes by coherent structures ofturbulence (bursting phenomena). This work concludes on one hand that the Two-Dimensional Particle Tracking Velocimetry by DigImage is reliable for the study of sediment transport as long as the video recordings are of good quality. It confirms on the other hand that the concentration profiles are not described well by a diffusion model. Finally, it concludes that some measurements agree with the bursting phenomena, in particular the observation of larger downward velocities and that some other measurements are more difficult to interpret, in particular downward velocities larger than the settling velocity when the injection is near the surface and near the point of observation. Subject laboratory flumesediment transportturbulent flow To reference this document use: http://resolver.tudelft.nl/uuid:474b7296-8491-4a57-9a0a-a667bd4a00a4 Part of collection Student theses Document type master thesis Rights (c) 1996 Adriaens, F. ; Van Rillaer, L. Files PDF Adriaens.pdf 12.18 MB Close viewer /islandora/object/uuid:474b7296-8491-4a57-9a0a-a667bd4a00a4/datastream/OBJ/view