Run-up related to onshore tsunami flows
The focus of the thesis is on onshore tsunami flows with special attention on tsunami run-up. In the aftermath of a tsunami, the most evident clue on the extent of a run-up is the water marks left behind. The trim-line recorded by surveyors is one of the most valuable pieces of information needed to...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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2017
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| Online Access: | http://hdl.handle.net/10356/69623 |
| _version_ | 1824455270733971456 |
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| author | Sim, Shawn Yisheng |
| author2 | Chiew Yee Meng |
| author_facet | Chiew Yee Meng Sim, Shawn Yisheng |
| author_sort | Sim, Shawn Yisheng |
| collection | NTU |
| description | The focus of the thesis is on onshore tsunami flows with special attention on tsunami run-up. In the aftermath of a tsunami, the most evident clue on the extent of a run-up is the water marks left behind. The trim-line recorded by surveyors is one of the most valuable pieces of information needed to determine the hydrodynamics parameters of the tsunami. However, it is also known that the most commonly used 2-D hydrodynamic models that attempt to reproduce the tsunami event do not produce good results during the onshore propagation phase. To bridge this gap, the use of an amplification factor proposed by Satake (1994) is investigated in this study. Experimentally, we used solitary waves to impinge on a model scaled coastal cliff to examine the flow depth at different onshore locations. The measured data are compared with the numerical results using the Delft3D-FLOW model. Besides, we also used dam break waves to evaluate the run-up both experimentally and numerically. The reason for doing so was two folds. First, dam break waves can provide us with a comparison to the often used solitary waves. Second, due to the discovery of a cave that has well preserved tsunami deposits off the coast of Banda Aceh, Indonesia, we found that experimental dam break waves have the potential not only to bring the sediments in, but also allow ample time for deposition to occur. Numerically, the sedimentation time within the cave is not easy to obtain using 2-D numerical models. Hence, based on the trim-line time series recorded, we provided a hypothetical sedimentation time that can be obtained using non-sediment laden flow tests. |
| first_indexed | 2025-02-19T03:35:33Z |
| format | Thesis |
| id | ntu-10356/69623 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:35:33Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/696232023-02-28T16:53:12Z Run-up related to onshore tsunami flows Sim, Shawn Yisheng Chiew Yee Meng Asian School of the Environment Earth Observatory of Singapore DRNTU::Engineering::Civil engineering::Water resources DRNTU::Science::Physics::Geophysics and geomagnetism The focus of the thesis is on onshore tsunami flows with special attention on tsunami run-up. In the aftermath of a tsunami, the most evident clue on the extent of a run-up is the water marks left behind. The trim-line recorded by surveyors is one of the most valuable pieces of information needed to determine the hydrodynamics parameters of the tsunami. However, it is also known that the most commonly used 2-D hydrodynamic models that attempt to reproduce the tsunami event do not produce good results during the onshore propagation phase. To bridge this gap, the use of an amplification factor proposed by Satake (1994) is investigated in this study. Experimentally, we used solitary waves to impinge on a model scaled coastal cliff to examine the flow depth at different onshore locations. The measured data are compared with the numerical results using the Delft3D-FLOW model. Besides, we also used dam break waves to evaluate the run-up both experimentally and numerically. The reason for doing so was two folds. First, dam break waves can provide us with a comparison to the often used solitary waves. Second, due to the discovery of a cave that has well preserved tsunami deposits off the coast of Banda Aceh, Indonesia, we found that experimental dam break waves have the potential not only to bring the sediments in, but also allow ample time for deposition to occur. Numerically, the sedimentation time within the cave is not easy to obtain using 2-D numerical models. Hence, based on the trim-line time series recorded, we provided a hypothetical sedimentation time that can be obtained using non-sediment laden flow tests. Doctor of Philosophy (ASE) 2017-03-11T03:09:45Z 2017-03-11T03:09:45Z 2017 Thesis Sim, S. Y. (2017). Run-up related to onshore tsunami flows. Doctoral thesis, Nanyang Technological University, Singapore. http://hdl.handle.net/10356/69623 10.32657/10356/69623 en 157 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Water resources DRNTU::Science::Physics::Geophysics and geomagnetism Sim, Shawn Yisheng Run-up related to onshore tsunami flows |
| title | Run-up related to onshore tsunami flows |
| title_full | Run-up related to onshore tsunami flows |
| title_fullStr | Run-up related to onshore tsunami flows |
| title_full_unstemmed | Run-up related to onshore tsunami flows |
| title_short | Run-up related to onshore tsunami flows |
| title_sort | run up related to onshore tsunami flows |
| topic | DRNTU::Engineering::Civil engineering::Water resources DRNTU::Science::Physics::Geophysics and geomagnetism |
| url | http://hdl.handle.net/10356/69623 |
| work_keys_str_mv | AT simshawnyisheng runuprelatedtoonshoretsunamiflows |