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LI Li,YE Taoyan,HE Zhiguo,XIA Yuezhang. 2018. A numerical study on the effect of tidal flat's slope on tidal dynamics in the Xiangshan Bay, China. Acta Oceanologica Sinica, 37(9):29-40
A numerical study on the effect of tidal flat's slope on tidal dynamics in the Xiangshan Bay, China
象山港潮滩坡度对潮动力影响的数值研究
Received:October 18, 2017  
DOI:10.1007/s13131-018-1263-8
Key words:tidal flat's slope  tidal dynamics  tidal asymmetry  tidal energy  Xiangshan Bay
中文关键词:  潮滩坡度  潮动力  潮汐不对称  潮能  象山港
基金项目:The National Natural Science Foundation of China under contract No. 41606103; the Zhejiang Provincial Natural Science Foundation of China under contract Nos LQ16D060002 and LR16E090001; the State Key Laboratory of Satellite Ocean Environment Dynamics (Second Institute of Oceanography, State Oceanic Administration) under contract No. SOED1512; the National Key Research and Development Program of China under contract No. 2017YFC1405101.
Author NameAffiliationE-mail
LI Li Ocean College, Zhejiang University, Zhoushan 316021, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310058, China 
 
YE Taoyan Ocean College, Zhejiang University, Zhoushan 316021, China  
HE Zhiguo Ocean College, Zhejiang University, Zhoushan 316021, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310058, China 
 
XIA Yuezhang Ocean College, Zhejiang University, Zhoushan 316021, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310058, China 
yzxia@zju.edu.cn 
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Abstract:
      The Xiangshan Bay is a semi-enclosed and narrow bay, which is characterized by large scale tidal flats and has been historically utilized through coastal construction and aquaculture engineering. The hydrodynamic model using the Finite Volume Coastal Ocean Model (FVCOM) was constructed to examine the changes of tidal dynamics due to the variation of tidal flat slopes. According to the model results, a decreased slope of a tidal flat would amplify the M2 tidal amplitude and delay the M2 tidal phase in the inner harbor, due to an increased tidal prism, and vice versa. The amplitude of the main shallow-water tide M4 would be amplified/dampened in the entire bay due to the changed bottom friction, if the tidal flat's slope were reduced/increased at the Tie inlet. The phase was advanced. The change of a tidal flat's slope at the Tie inlet had greater impacts on tidal amplitude, phase and duration asymmetry, than that at the Xihu inlet. The impact of changes of the tidal flat slope at the Xihu inlet was small and was constrained locally. Changes in the tidal flats' slopes at the Tie and Xihu inlets changed the tidal duration asymmetry, residual current and tidal energy via modulating tides. The ebb dominance decreased when the tidal flat's slope at the Tie inlet was changed. Decreased/increased ebb dominance occurred when the tidal flat's slope was reduced/increased at the Xihu inlet. The residual current and tidal energy density was amplified/dampened and more/less tidal energy was dissipated, with reduced/increased slope at both of the inlets. The findings in this study are instructive to coastal engineering and estuarine management.
中文摘要:
      象山港属于狭长型半封闭港湾,湾内分布有大面积潮滩。多年以来象山港内实施了大量海岸工程及养殖工程,湾内潮滩坡度发生了显著变化。基于非结构网格和有限体积数值模式(FVCOM)建立象山港三维潮动力模型,研究湾内不同区域潮滩坡度变化对象山港潮动力过程的影响机理。结果表明:潮滩坡度下降将增大湾内纳潮量,进而增大M2分潮振幅和迟角,反之则反。铁港潮滩坡度的减小(增大),将改变底部耗散项,进而增大(减小)M4分潮振幅。由于M2和M4分潮的振幅在湾顶较大,所以湾顶(铁港)潮滩坡度对象山港潮动力过程的影响明显大于侧岸(西沪港)。西沪港潮滩坡度对象山港潮动力过程的影响是局部的。铁港、西沪港潮滩坡度对湾内潮汐不对称、余流及潮能影响显著。铁港潮滩坡度的改变均会减弱湾内落潮占优程度。西沪港区域潮滩坡度的减小将减弱湾内落潮占优趋势,反之则反。铁港和西沪港潮滩坡度的减小,将增大余流大小及潮能密度,进而潮能耗散增大,反之则反。研究结果对河口海岸潮滩区域的工程建设及生态修复有重要参考价值。
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