Abstract
Methods are proposed to take account of the effect of emergent vegetation (which covers
only part of the channel bed) on conveyance and depth-averaged velocity in open
channels. For emergent vegetation strips parallel to the flow direction, discharge can be
predicted separately for each vegetated or non-vegetated zone. The equations of Kaiser
(1985) and Nuding (1991, 1994) can predict the influence of the vegetation on
conveyance within the non-vegetated zone via the composite roughness formula of
Pavlovski (1931). In order to predict the lateral distribution of depth-averaged velocity
within the non-vegetated zone, the equations of Nuding (1991, 1994) have been modified
to take account of the relation between non-vegetated zone width, apparent shear stress
on the vegetation interface and the maximum velocity which will occur. For more
complex geometries, two-dimensional numerical hydraulic models using existing
software and existing relations for the prediction of eddy viscosity are recommended.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/4838 |
| Date | 16 May 2008 |
| Creators | Hirschowitz, Peter Mark |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 12996 bytes, 1046961 bytes, 29049 bytes, 7684106 bytes, 592169 bytes, 56184 bytes, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf, application/pdf |
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