The Characteristic Analysis of Internal Solitons in the Liuhua Area of the South China Sea
- Bo-Tao Xie (Central Research Institute) | Jia-gang Li (Central Research Institute) | Xu-he Ren (Central Research Institute) | Fang-hui Lei (Central Research Institute)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- duration, internal solitons, South China Sea, amplitude, shear velocity
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- 21 since 2007
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The ocean dynamic environmental conditions are important for the construction design. Although typhoons principally govern extreme value metocean design loading, internal solitary waves (ISWs) also present substantial engineering concerns. ISWs with characteristic of large amplitude induce strong vertical mixing, vertical shear of horizontal velocity and make notable impacts on the safety of the ocean engineering, oil drilling platforms and submarine pipelines. According to the observed data from a submerged buoy system at Liuhua area in the northern South China Sea (SCS), the characteristics of internal solitons, such as amplitude, current speed, duration and shear velocity have been studied in this paper. The results can provide a reference and technical support for the design and construction in SCS.
The South China Sea (SCS) is rich in oil and gas resources, but the environment condition is complicated. The extreme environment loading induced by typhoons in summer gives austere challenge to platform structures and the internal solitary waves (ISWs) accompanied by strong shear currents can cause serious hazards to the offshore working ships and the floating platform design.
These large amplitude ISWs induce strong currents which have substantial but not well-studied effects on offshore oil engineering. Oil companies working northeast to northwest of Liuhua have been surprised by solitons and experienced equipment damage during tanker operations and a platform installation (Bole, 1994).
Internal solitary waves (ISWs) are observed all over the world ocean, especially on the continental shelves (Liu et al., 1998; Ramp et al., 2004). Observations indicate that ISWs in the South China Sea region are among the largest and fastest in the world, with wave amplitudes in excess of 100 m and propagation speeds close to 3 m/s (Klymak, et al., 2006). They appear to originate near the Luzon Strait and propagate westward across the SCS basin until they encounter the shelf near China’s coast (Zhao et al., 2003). The mechanisms of the ISWs and the processes evolution are rather complicated due to strong interactions between currents, eddies, and topography.
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