The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example

XU Zhuo; ZHANG Wei; LU Peidong; CHEN Kefeng

doi:10.1007/s13131-015-0637-4

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(3): 99-107

XU Zhuo, ZHANG Wei, LU Peidong, CHEN Kefeng. The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example[J]. Acta Oceanologica Sinica, 2015, 34(3): 99-107. doi: 10.1007/s13131-015-0637-4

Citation:

XU Zhuo, ZHANG Wei, LU Peidong, CHEN Kefeng. The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example[J]. Acta Oceanologica Sinica, 2015, 34(3): 99-107. doi: 10.1007/s13131-015-0637-4

Citation:

XU Zhuo, ZHANG Wei, LU Peidong, CHEN Kefeng. The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example[J]. Acta Oceanologica Sinica, 2015, 34(3): 99-107. doi: 10.1007/s13131-015-0637-4

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The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example

doi: 10.1007/s13131-015-0637-4

1.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;The Development Office of Yangtze River in Tongzhou District, Nantong 226301, China
2.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3.
River and Harbor Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China

Received Date: 2013-11-08
Rev Recd Date: 2014-10-08

Abstract

Abstract

Owing to the interactions among the complex terrain, bottom materials, and the complicate hydrodynamics, typhoon waves show special characteristics as big waves appeared at the high water level (HWL) and small waves emerged at low and middle water levels (LWL and MWL) in radial sand ridges (RSR). It is assumed that the mud damping, sandy bed friction and wave breaking effects have a great influence on the typhoon wave propagation in this area. Under the low wave energy, a mud layer will form and transport into the shallow area, thus the mud damping effects dominate at the LWL and the MWL. And high Collins coefficient (c around 1) can be applied to computing the damping effects at the LWL and the MWL. But under the high wave energy, the bottom sediment will be stirred and suspended, and then the damping effects disappear at the HWL. Thus the varying Collins coefficient with the water level method (VCWL) is implemented into the SWAN to model the typhoon wave process in the Lanshayang Channel (LSYC) of the RSR, the observed wave data under “Winnie” (“9711”) typhoon was used as validation. The results show that the typhoon wave in the RSR area is able to be simulated by the VCWL method concisely, and a constant wave breaking coefficient (γ) equaling 0.78 is better for the RSR where wide tidal flats and gentle bed slopes exist.
- typhoon wave

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References(31)

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