Surface wave propagation in coastal waters with viscoelastic boundaries
In the present study, a novel experimental approach is developed that can enable the verification of existing models for wave interactions with viscoelastic boundaries in the laboratory. Viscoelastic floating covers are prepared with the blended mixture of white oil and Polydimethylsiloxane (PDMS) m...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Online Access: | https://hdl.handle.net/10356/106427 http://hdl.handle.net/10220/47962 https://doi.org/10.32657/10220/47962 |
| _version_ | 1826123054981316608 |
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| author | Dharma Sree K K |
| author2 | Law Wing-Keung, Adrian |
| author_facet | Law Wing-Keung, Adrian Dharma Sree K K |
| author_sort | Dharma Sree K K |
| collection | NTU |
| description | In the present study, a novel experimental approach is developed that can enable the verification of existing models for wave interactions with viscoelastic boundaries in the laboratory. Viscoelastic floating covers are prepared with the blended mixture of white oil and Polydimethylsiloxane (PDMS) material, while the bottom beds are prepared by doping glycerol with PDMS. Special curing procedures are also established to create large uniform sheets. Wave flume experiments are conducted to quantify the wave interaction with unbroken viscoelastic floating covers, viscoelastic floating segments, viscoelastic bottoms, as well as both viscoelastic top and bottom layers. It is found that the rheological properties play a key role in the modification of surface waves with respect to open water case. In particular, the viscoelastic covers behave as a low-pass filter, damping high frequency surface waves effectively. Satisfactory agreement is obtained for the dispersion relation between the experimental and theoretical results, however significant discrepancy exists for the wave attenuation. Experiments of wave interactions with fresh water ice are conducted at the University of Melbourne with several types of ice covers. Finally, wave interactions with flexible viscoelastic bottoms are studied in shallow waters, as well as a three-layer system with combined viscoelastic top and bottom boundaries. |
| first_indexed | 2024-10-01T05:58:41Z |
| format | Thesis |
| id | ntu-10356/106427 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:58:41Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1064272019-12-06T22:11:30Z Surface wave propagation in coastal waters with viscoelastic boundaries Dharma Sree K K Law Wing-Keung, Adrian School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute DRNTU::Engineering::Civil engineering::Water resources In the present study, a novel experimental approach is developed that can enable the verification of existing models for wave interactions with viscoelastic boundaries in the laboratory. Viscoelastic floating covers are prepared with the blended mixture of white oil and Polydimethylsiloxane (PDMS) material, while the bottom beds are prepared by doping glycerol with PDMS. Special curing procedures are also established to create large uniform sheets. Wave flume experiments are conducted to quantify the wave interaction with unbroken viscoelastic floating covers, viscoelastic floating segments, viscoelastic bottoms, as well as both viscoelastic top and bottom layers. It is found that the rheological properties play a key role in the modification of surface waves with respect to open water case. In particular, the viscoelastic covers behave as a low-pass filter, damping high frequency surface waves effectively. Satisfactory agreement is obtained for the dispersion relation between the experimental and theoretical results, however significant discrepancy exists for the wave attenuation. Experiments of wave interactions with fresh water ice are conducted at the University of Melbourne with several types of ice covers. Finally, wave interactions with flexible viscoelastic bottoms are studied in shallow waters, as well as a three-layer system with combined viscoelastic top and bottom boundaries. Doctor of Philosophy 2019-04-02T01:57:58Z 2019-12-06T22:11:30Z 2019-04-02T01:57:58Z 2019-12-06T22:11:30Z 2019 Thesis Dharma Sree K. K. (2019). Surface wave propagation in coastal waters with viscoelastic boundaries. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/106427 http://hdl.handle.net/10220/47962 https://doi.org/10.32657/10220/47962 en 218 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Water resources Dharma Sree K K Surface wave propagation in coastal waters with viscoelastic boundaries |
| title | Surface wave propagation in coastal waters with viscoelastic boundaries |
| title_full | Surface wave propagation in coastal waters with viscoelastic boundaries |
| title_fullStr | Surface wave propagation in coastal waters with viscoelastic boundaries |
| title_full_unstemmed | Surface wave propagation in coastal waters with viscoelastic boundaries |
| title_short | Surface wave propagation in coastal waters with viscoelastic boundaries |
| title_sort | surface wave propagation in coastal waters with viscoelastic boundaries |
| topic | DRNTU::Engineering::Civil engineering::Water resources |
| url | https://hdl.handle.net/10356/106427 http://hdl.handle.net/10220/47962 https://doi.org/10.32657/10220/47962 |
| work_keys_str_mv | AT dharmasreekk surfacewavepropagationincoastalwaterswithviscoelasticboundaries |