Thesis (MScEng)--University of Stellenbosch, 2004. / ENGLISH ABSTRACT: This work investigates methods to theoretically determine the lateral velocity distribution
across a river from which factors may be derived to translate a single point velocity into
average velocity for the river as a whole.
A wide range of field data from vanous nvers was analysed. This produced over a
hundred velocity distributions with which to compare theoretical distribution results. Four
theoretical approaches were considered: the one-dimensional method (Manning's
equation), a two-dimensional flow formula solved as an initial-value-problem, a two
dimensional flow formula solved as a boundary-value-problem and an empirical method
developed from energy principles.
The one-dimensional and initial-value-problem approaches were unsuccessful. The
boundary-value and empirical approach did however produce promising results.
Surprisingly the analysis of the field data revealed patterns of similarity which could
produce accurate results without the need of a theoretical approach. / AFRIKAANSE OPSOMMING: Metodes word ondersoek om teoreties 'n laterale snelheidsverspreiding oor 'n rivier te
bepaal en sodoende 'n faktor te vind waarmee 'n gemete enkelpuntsnelheid in die rivier
omgeskakel kan word na 'n gemiddelde snelheid vir die rivier in geheel.
Vloeimeetdata van verskeie nviere IS geanaliseer. Sodoende is meer as 100
snelheidsverspreidings gegenereer waarmee die teorie vergelyk kon word. Vier teoretiese
benaderings is gevolg: Manning se een-dimensionele vloeivergelyking, 'n twee
dimensionele vloei-vergelyking opgelos met behulp van 'n beginwaarde, 'n twee
dimensionele vloei-vergelyking opgelos met behulp van randwaardes, en 'n empiriese
metode ontwikkel vanuit energie beginsels.
Die een-dimensionele- en beginwaarde-benaderings was me suksesvol me. Die
randwaarde- en empiriese benaderings het wel belowende resultate gelewer. Selfs
verwerking van die gemete stroommetings het waardevolle inligting gelewer: daar bestaan
duidelike ooreenkomste in die snelheidsverspreidings wat gebruik kan word om die
verspreidingsfaktor mee te bereken sonder om teoretiese oplossings te soek.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/50087 |
| Date | 12 1900 |
| Creators | Cloete, Gert Christiaan |
| Contributors | Rooseboom, A., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 1 v. (various foliations) : ill. |
| Rights | Stellenbosch University |
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