Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106427
Title: Surface wave propagation in coastal waters with viscoelastic boundaries
Authors: Dharma Sree K K
Keywords: DRNTU::Engineering::Civil engineering::Water resources
Issue Date: 2019
Source: Dharma Sree K. K. (2019). Surface wave propagation in coastal waters with viscoelastic boundaries. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: 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.
URI: https://hdl.handle.net/10356/106427
http://hdl.handle.net/10220/47962
DOI: 10.32657/10220/47962
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Theses

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