| XU Zhuo,ZHANG Wei,LU Peidong,CHEN Kefeng. 2015. The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example. Acta Oceanologica Sinica, 34(3):99－107 |
| The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example |
| 南黄海辐射沙脊群台风浪传播底摩阻和破波系数研究——以烂沙洋水道为例 |
| Received:November 08, 2013 Revised:October 08, 2014 |
| DOI：10.1007/s13131-015-0637-4 |
| Key words:typhoon wave radial sand ridges RSR mud damping effects varying Collins coefficient with the water level method wave breaking coefficient |
| 中文关键词: 台风浪， 辐射沙脊群，阻尼效应，随水位升降变Collins系数法， 破波系数 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XU Zhuo | College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
The Development Office of Yangtze River in Tongzhou District, Nantong 226301, China | | | ZHANG Wei | College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China | zhangweihhu@vip.sina.com | | LU Peidong | River and Harbor Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China | | | CHEN Kefeng | River and Harbor Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China | |
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| 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. |
| 中文摘要: |
| 受到复杂地貌、底质、水动力的相互影响，辐射沙脊群的台风浪呈现中低潮阶段波高较小，高潮阶段波高较大的特征。一般而言，粉沙淤泥底质的阻尼效应，砂质海床的底摩阻和波浪破碎对研究区域的波浪传播有较大影响。受低能波影响，近底粉沙淤泥层形成并随波浪运动至浅水区域，因此，阻尼效应在中、低潮位较为普遍，较大Collins系数（1左右）可用于计算中低潮位阶段阻尼效应导致的波能损耗。但受高能波作用，底质起动、悬扬，阻尼效应逐渐消失。籍此，提出随水位升降变Collins系数法，并植入SWAN模拟辐射沙脊群烂沙洋水道的台风浪过程，同时利用“9711”台风期间的波浪观测数据进行验证。验证结果显示，随水位升降变Collins系数法可较为准确地模拟辐射沙脊群期间的台风浪，同时，破波系数0.78适用于计算辐射沙脊群这种缓坡宽潮滩的台风浪。 |
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