Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Protrusions on Stepped Spillways to Improve Energy Dissipation
Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Stellenbosch : University of Stellenbosch
2008
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613771912970240 |
|---|---|
| access_status_str | Open Access |
| author | Wright, Henry-John |
| author2 | Basson, G. R. |
| author_browse | Basson, G. R. Wright, Henry-John |
| author_facet | Basson, G. R. Wright, Henry-John |
| author_sort | Wright, Henry-John |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2408 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:26.849Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/2408 Protrusions on Stepped Spillways to Improve Energy Dissipation Wright, Henry-John Basson, G. R. University of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering. Spillway Hydraulic roughness Stepped spillway Protrusions Theses -- Civil engineering Dissertations -- Civil engineering Spillways -- Design and construction Civil engineering Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006. Stepped spillways constructed of roller compacted concrete (RCC) is a hydraulic and cost effective measure to dissipate energy of large water flows over the spillway of a dam. Stepped spillways, like other spillway types, have its limitations and a measure to improve the energy dissipation effectiveness is proposed. Two hydraulic models were constructed at the hydraulics laboratory of the Department of Water Affairs and Forestry (DWAF) in Pretoria, South Africa. The scales of the models were 1:20 and 1:30. The study proposes the use of triangular protrusions applied over the spillway surface. The protrusions have the same height as the steps, with the width of the protrusions varying. The triangular protrusions deflect the water sideways resulting in higher energy losses. The results indicate that the protrusions reduce scouring at the toe of the dam, thus increasing the roughness of the steps. It also indicate that aeration occur earlier than with normal stepped spillways. An optimal spacing, lateral and across the steps, are proposed. The construction of the protrusions is also discussed, as well as the cost implications. It is concluded that the protrusions are effective at a unit discharge up to 35 m3/s.m. This value is however dependent on the configuration of the apron downstream of the toe of the dam. It is proposed that protrusions be added on the downstream face of the dam on every second step, with one protrusion and then no protrusion alternating in the flow path. It is recommended that the protrusions be cast in situ. 2008-08-11T09:42:38Z 2010-06-01T08:48:06Z 2008-08-11T09:42:38Z 2010-06-01T08:48:06Z 2006-12 Thesis http://hdl.handle.net/10019.1/2408 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Spillway Hydraulic roughness Stepped spillway Protrusions Theses -- Civil engineering Dissertations -- Civil engineering Spillways -- Design and construction Civil engineering Wright, Henry-John Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title | Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title_full | Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title_fullStr | Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title_full_unstemmed | Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title_short | Protrusions on Stepped Spillways to Improve Energy Dissipation |
| title_sort | protrusions on stepped spillways to improve energy dissipation |
| topic | Spillway Hydraulic roughness Stepped spillway Protrusions Theses -- Civil engineering Dissertations -- Civil engineering Spillways -- Design and construction Civil engineering |
| url | http://hdl.handle.net/10019.1/2408 |
| work_keys_str_mv | AT wrighthenryjohn protrusionsonsteppedspillwaystoimproveenergydissipation |