Tsunami induced wave and current amplification and sedimentation in closed basins

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2015

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Kian, Rozita

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Wave and current amplification inside the basins are related to different parameters. Wave period is one of the important parameters which governs the amplification inside the basins. If the period of incident wave coincides with one of the periods of free oscillations in the basin then resonant oscillation and amplification happens. Resonance inside harbors due to tsunami waves can exacerbate the damages by amplifying the water level changes, and currents. This phenomenon is important and cause unexpected amplifications and hence affects the harbor operations and management due to not only extreme water elevations but also morphological changes. Generally tsunamis in shallow water zone lead to sea water level rise and fall, strong currents, forces (drag, impact, uplift, etc.), drawdown, scour, and morphological changes (erosion, deposition), debris and debris flow, dynamic water pressure, resonant oscillations and seiches. As a result ground material under the tsunami motion move and scour/erosion/deposition patterns can be observed in the region. Tsunamis carry vast amount of materials and cause morphological erosion and/or deposition on coastal utilities inside basins and harbors. In addition tsunamis cause functional failure in the ports due to depth change and damage. Modes of sediment transport can be determined according to the Rouse number values. Sediment transport modes are in the form of bed load, suspended load and wash load. In this study the response and behavior of water motions inside the enclosed basins under long wave conditions are investigated by using numerical model (NAMI DANCE). The spatial and temporal changes of main tsunami parameters and their adverse effects on harbor performance are studied specifically monitoring the wave and current amplifications and consequent variation of sediment motion in terms of Rouse number, In the case studies the resonance analysis in L-type basins, the effects of incident wave period and basin geometry are investigated. The possible effects of tsunamis and or long waves to Belek region in Antalya and Haydarpasa harbour are also investigated as other case studies in terms of tsunami induced sedimentation and amplification effects under tsunamis. The results are presented with discussions.

Subject Keywords

Tsunamis., Coasts., Shorelines., Ocean waves., Basins (Geology)., Sedimentology.

URI

http://etd.lib.metu.edu.tr/upload/12619536/index.pdf
https://hdl.handle.net/11511/25271

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

R. Kian, “Tsunami induced wave and current amplification and sedimentation in closed basins,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.