Wave interactions with circular ice ridge embedded in level ice

• Main Authors: Mandal, Sourav, Law, Adrian Wing-Keung, Shen, Hayley H.
• Other Authors: School of Civil and Environmental Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Civil engineering; Flexural-gravity Waves; Ice Ridge
• Online Access: https://hdl.handle.net/10356/141422
• Institution: Nanyang Technological University

The present study examines the wave interactions with a circular elastic body trapped within a thin cover of sea ice of substantial extent. This configuration is an idealization of an ice ridge embedded in a field of level ice. The ice cover and ice ridge are both modeled as thin elastic plates. Two independent approaches are used. The first approach ignores the finite draft, and a closed form solution is obtained by taking the inner product with respect to the eigenfunctions for the ice-covered region. The second approach includes the finite draft, and a least square approximation method is adopted along with the matching of velocity and pressure between the ice cover and ice ridge. Using the second approach, the surge force on the ice ridge, its deflection and the bending moments over the surface are then computed for various ridge configurations and wave characteristics. The submergence of the ridge is found to have a considerable effect on the deflection as well as the surge force in the presence of the ice cover. The results show that the level ice significantly affects the ice ridge response to shorter waves. It is found that the ridge embedded in ice cover experiences larger bending moments compared to the open water case. The results from the present study can help estimate the response of ice ridges to incoming waves, as well as aid in the design of offshore cylindrical structures embedded in level ice.