Preliminary application of hot-film wall shear stress sensor under breaking waves

Hao Siyu; Xia Yunfeng; Xu Hua; Cai Zhewei

doi:10.11729/syltlx20170037

Volume 31 Issue 3

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Journal of Experiments in Fluid Mechanics > 2017 > 31(3): 60-65. > DOI: 10.11729/syltlx20170037

Hao Siyu, Xia Yunfeng, Xu Hua, Cai Zhewei. Preliminary application of hot-film wall shear stress sensor under breaking waves[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(3): 60-65. DOI: 10.11729/syltlx20170037

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Preliminary application of hot-film wall shear stress sensor under breaking waves

Hao Siyu^{1, 2, 3, 4, ,},
Xia Yunfeng^{1, 3, 4},
Xu Hua^{1, 3, 4},
Cai Zhewei^{1, 3, 4}

1.
Nanjing Hydraulic Research Institute, Nanjing 210029, China
2.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3.
The State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Nanjing 210098, China
4.
Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport, Nanjing 210024, China

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Received Date: March 05, 2017
Revised Date: May 21, 2017

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Abstract

Abstract

The knowledge of the bed shear stress under breaking waves is essential for understanding the sediment transport and beach morphology in the surf zone. The turbulence and vortexes generated by breaking waves have a significant effect on the bed shear stress. Application tests of the bed shear stress measurement under breaking waves by the MEMS flexible hot-film shear stress sensor are conducted in a wave flume. The experimental results show that the sensor can be applied to the measurement of the bed shear stress under breaking waves. Before the breaking point, the direction of the bed shear stress can be determined by the near-bed velocity. The change of the bed shear stress is gentle before wave breaking. The fluctuations and the peak value of the bed shear stress increase after wave breaking. The extreme value of the average maximum bed shear stress along the slope appears after the plunging point.
- breaking waves,
- wall shear stress sensor,
- bed shear stress,
- plunging breaker

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