远区台风“三巴”对河口波浪增水和波生流影响数值模拟研究

任剑波; 何青; 沈健; 郭磊城; 徐凡

doi:10.3969/j.issn.1001-909X.2019.03.003

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海洋学研究 ›› 2019, Vol. 37 ›› Issue (3) : 21-30. DOI: 10.3969/j.issn.1001-909X.2019.03.003

研究论文

远区台风“三巴”对河口波浪增水和波生流影响数值模拟研究

任剑波^1,2, 何青^*1, 沈健³, 郭磊城¹, 徐凡¹

作者信息 +

Numerical simulation of the effect of a remote typhoon “Sanba” on wave set-up and wave-induced current in the Changjiang Estuary

REN Jian-bo^1,2, HE Qing^*1, SHEN Jian³, GUO Lei-cheng¹, XU Fan¹

Author information +

文章历史 +

摘要

波浪增水和波生流是河口泥沙输运、地貌演变和污染物扩散的重要动力之一,但目前关于远区台风影响下长江口波浪增水和波生流的研究比较缺乏。本文建立了覆盖东中国海的台风-天文潮-波浪耦合三维数值模型,研究了远区台风“三巴”对长江口波浪增水和波生流的影响。结果表明:波浪从台风中心向近岸传播过程中,能量耗散引起波浪作用力的衰减和辐射应力的增大,产生波浪增水,长江口波浪增水在0.05 ~0.20 m之间,占台风总增水值的15%~22%。从NW向入射的台风浪产生自北向南的波生沿岸流,垂向上呈现三维结构,平均流速在0.05~0.20 m/s之间,占风暴潮流的15%~50%,充分说明了远区台风可以对长江口波浪增水和波生流产生明显影响,研究成果可以为河口极值水位和流速计算、泥沙输运、水下三角洲地貌演变等研究提供参考。

Abstract

Wave set-up and wave-induced current are the significant dynamics for sediment transport, geomorphology and pollutant diffusion in estuaries, however, researches were rare under remote typhoon conditions in the Changjiang Estuary. In this study, we focused on the spatial distribution of wave set-up and wave-induced current under a remote typhoon named “Sanba” by a coupled 3-D model of typhoon-wind, tide and wave. The results showed that the radiation stress and wave set-up increased when wave propagated from the typhoon eye to coast due to wave energy dissipations, the maximum value of wave set-up could reach up to 0.05~0.20 m, which was 15%~22% of the total water level rise induced by typhoon. The along-shore current generated by wave were about 0.05~0.20 m/s, and could reach up to 15%~50% of storm-induced current. It implied that a remote typhoon could have significant influence on wave set-up and wind-induced current. The research could provide the basis for calculation of return period water level and current, sediment transport, geomorphological evolution of subaqueous delta and so on.

导出引用

任剑波, 何青, 沈健, 郭磊城, 徐凡. 远区台风“三巴”对河口波浪增水和波生流影响数值模拟研究[J]. 海洋学研究. 2019, 37(3): 21-30 https://doi.org/10.3969/j.issn.1001-909X.2019.03.003

REN Jian-bo, HE Qing, SHEN Jian, GUO Lei-cheng, XU Fan. Numerical simulation of the effect of a remote typhoon “Sanba” on wave set-up and wave-induced current in the Changjiang Estuary[J]. Journal of Marine Sciences. 2019, 37(3): 21-30 https://doi.org/10.3969/j.issn.1001-909X.2019.03.003

中图分类号： P731.2

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