Bed protection below culvert outlets
Riprap continues to be the most widely used method for protection of erodible channel boundaries. In this report, an experimental study was conducted to understand the mechanisms and characteristics of scour without protection below culvert outlets, and thereby investigating a suitably sized riprap...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2010
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| Online Access: | http://hdl.handle.net/10356/39600 |
| _version_ | 1811685878276292608 |
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| author | Ma, Yin |
| author2 | Lim Siow Yong |
| author_facet | Lim Siow Yong Ma, Yin |
| author_sort | Ma, Yin |
| collection | NTU |
| description | Riprap continues to be the most widely used method for protection of erodible channel boundaries. In this report, an experimental study was conducted to understand the mechanisms and characteristics of scour without protection below culvert outlets, and thereby investigating a suitably sized riprap protection for the bed material to reduce the scouring effect of the jet flow.
The basis of protection is by laying a blanket of riprap stones at culvert outlets to dissipate the highly erosive kinetic energy of the discharge.
Two sets of experiments were done. The first set sought to understand the basic characteristics of scour without protection. Based on the experiments conducted, it was found the scour depth and geometry depends on the tailwater depth and Froude number.
The second set investigated the effects of varying size and thickness of riprap blanket on the downstream condition at incipient flow velocities below the culvert outlets. The results were compared with the first set under the same test condition. It was found the riprap protection significantly minimizes the scour condition and the optimum thickness of the riprap layer was 2D50. The empirical relations between the size of stone with flow velocity and Froude number were proposed as well. |
| first_indexed | 2024-10-01T04:51:31Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/39600 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:51:31Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | ntu-10356/396002023-03-03T17:16:47Z Bed protection below culvert outlets Ma, Yin Lim Siow Yong School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering Riprap continues to be the most widely used method for protection of erodible channel boundaries. In this report, an experimental study was conducted to understand the mechanisms and characteristics of scour without protection below culvert outlets, and thereby investigating a suitably sized riprap protection for the bed material to reduce the scouring effect of the jet flow. The basis of protection is by laying a blanket of riprap stones at culvert outlets to dissipate the highly erosive kinetic energy of the discharge. Two sets of experiments were done. The first set sought to understand the basic characteristics of scour without protection. Based on the experiments conducted, it was found the scour depth and geometry depends on the tailwater depth and Froude number. The second set investigated the effects of varying size and thickness of riprap blanket on the downstream condition at incipient flow velocities below the culvert outlets. The results were compared with the first set under the same test condition. It was found the riprap protection significantly minimizes the scour condition and the optimum thickness of the riprap layer was 2D50. The empirical relations between the size of stone with flow velocity and Froude number were proposed as well. Bachelor of Engineering (Environmental Engineering) 2010-06-01T06:03:50Z 2010-06-01T06:03:50Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/39600 en Nanyang Technological University 109 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Environmental engineering Ma, Yin Bed protection below culvert outlets |
| title | Bed protection below culvert outlets |
| title_full | Bed protection below culvert outlets |
| title_fullStr | Bed protection below culvert outlets |
| title_full_unstemmed | Bed protection below culvert outlets |
| title_short | Bed protection below culvert outlets |
| title_sort | bed protection below culvert outlets |
| topic | DRNTU::Engineering::Environmental engineering |
| url | http://hdl.handle.net/10356/39600 |
| work_keys_str_mv | AT mayin bedprotectionbelowculvertoutlets |