Print Email Facebook Twitter Simulation of a curved flume bed-load experiment Title Simulation of a curved flume bed-load experiment Author Talmon, A.M. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 1988-06-01 Abstract The mathematical model for river bend morphology, as developed by Olesen, for bed-load transport is discussed, by comparing the results with some new experimental data. The model consists of a two-dimensional depth-averaged flow model together with a sediment balance and can be used to compute the dynamic river bend morphology. The main purpose of this investigation was to develop the data acquisition procedures for a suspended-load experiment in a curved flume by means of an experiment with bed-load only. The experiment provided some new data to test the present morphological model. In this report the results of the experiment are discussed. A remarkable point is that the experimental data show a persistent harmonic longitudinal perturbation of the bed topography. The computations, however, show a strongly damped bed topography, even for unrealistic parameter combinations. The computed depth at the point-bar and the corresponding pool is made to correspond with the experimental data, by a significant change of the submodel for the direction of the bed-load transport and the transport model itself. Probable causes for the discrepancy between the data and the computation are the small width-depth ratio and the low transport rate of the experiment (close to the initiation of sediment motion). The small width-depth ratio is an unfavourable circumstance in view of the assumptions used in the depth-averaged flow model. The low transport rate requires a modified transport model. Nonetheless a satisfying explanation for the bed oscillation, as observed in the experiment could not be found. Subject morphologycurved flumebed-load transportbed-loadexperimentssuspended-loaddata acquisition procedures To reference this document use: http://resolver.tudelft.nl/uuid:6ec847d9-e2aa-47b1-b870-20aa77dad96b Publisher TU Delft, Department of Hydraulic Engineering Source Report no. 5-88 Part of collection Institutional Repository Document type report Rights (c) 1988 TU Delft, Department of Hydraulic Engineering Files PDF Talmon1988.pdf 8.83 MB Close viewer /islandora/object/uuid:6ec847d9-e2aa-47b1-b870-20aa77dad96b/datastream/OBJ/view