The simulation of sediment motion in a hydraulic model of an estuary or a tidal river is a complex problem, and one that has received considerable attention in recent years. As a result of this, there exists a large number of published theories, each of which might be used as a basis for the design of hydraulic models. This thesis seeks to understand and to relate several of these design methods, including those that have been adopted as standard practice in some of the leading hydraulic laboratories. Eight methods are examined in detail, and the similarities and the discrepancies noted. The conclusion is reached that there is still an insufficient amount of experimental data available with which to assess these conflicting proposals. A series of experiments is therefore undertaken rising a hydraulic model of the Tay estuary. Particular attention is given to the choice of the bed material and the sediment time scale. Five different bed materials are used in the investigation, and the development and the shape of the different bed formations are studied in detail. The experiments are repeated with a reduced vertical exaggeration. The results are correlated with each design method and the deviations evaluated systematically so that each method is ranked in order of agreement. Although most of the design methods are found to give a reasonable indication of the sediment time scale, no one method is found to be sufficiently comprehensive to include all aspects of sediment motion similarity. Certain conclusions are made in connection with this, and some proposals put forward concerning future work in this interesting field of study.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:635922 |
| Date | January 1969 |
| Creators | Knight, Donald William |
| Publisher | University of Aberdeen |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602226 |
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