Numerical investigation on velocity distribution in the shoaling laminar wave bottom boundary layer

Li Cheng; Zhang Chi; Sui Titi

doi:10.3969/j.issn.0253-4193.2016.05.013

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Li Cheng, Zhang Chi, Sui Titi. Numerical investigation on velocity distribution in the shoaling laminar wave bottom boundary layer[J]. Haiyang Xuebao, 2016, 38(5): 141-149. doi: 10.3969/j.issn.0253-4193.2016.05.013

Citation:

Li Cheng, Zhang Chi, Sui Titi. Numerical investigation on velocity distribution in the shoaling laminar wave bottom boundary layer[J]. Haiyang Xuebao, 2016, 38(5): 141-149. doi: 10.3969/j.issn.0253-4193.2016.05.013

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Numerical investigation on velocity distribution in the shoaling laminar wave bottom boundary layer

doi: 10.3969/j.issn.0253-4193.2016.05.013

Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China;College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China

Received Date: 2015-05-10

Abstract

Abstract

An improved second-order numerical model for wave bottom boundary layer is developed, which includes both effects of wave Reynolds stress and mean horizontal pressure gradient. The simulated instantaneous velocity profiles, oscillatory velocity amplitudes and mean velocity profiles in the laminar boundary layer beneath shoaling waves are in good agreements with the experimental data. Effects of various dynamic processes on the mean velocity distribution are discussed. Results reveal that the mean velocity is directed onshore and offshore in the lower and upper regions of the bottom boundary layer, respectively, and this pattern becomes increasing obvious as wave shoals over a sloping bed. The near-bed onshore mean velocity is dominated by wave Reynolds stress related to the second-order advective terms, while the offshore mean velocity in the upper region is mostly due to the mean horizontal pressure gradient related to the undertow current.
- wave shoaling,
- bottom boundary layer,
- mean velocity,
- numerical simulation

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References(15)

References

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