泉州湾内洛阳江口涨落潮流不对称性的数值研究

应用1个改进的含有动边界技术的河口海岸动力模型模拟了泉州湾洛阳江口的潮汐潮流.结果表明M2分潮在洛阳江口的主河道占据主导地位,但是随着潮波向浅滩的传播,其能量通过海底摩擦作用或非线性耗散作用逐渐转移至浅水潮,其中尤以M4分潮的增长最为显著.浅水分潮的增长又会引起天文分潮涨、落潮流的不对称性.进一步检验洛阳江口的潮流历时（月平均的涨、落潮流历时分别为6 h 1 min 30 s和6 h 19 min 58 s）和潮汐余流特征发现：该水域以涨潮流为主,由此产生的涨、落潮流的不对称可能有利于潮滩的进一步扩展.

Numerical study of tidal current asymmetry in the Luoyangjiang Estuary of Quanzhou Bay

A modified estuarine coastal ocean model with moving boundaries was used to reproduce tidal currents in the Luoyangjiang Estuary of Quanzhou Bay.The results revealed that the M2 tide is dominant in the main channel,but that as it propagates towards tidal flats,its energy transfers to overtides or compound tides either through bottom friction or nonlinear dissipation processes.The results also revealed that among shallow water tides,the growth of M4 was most conspicuous and contributed the most to the M2 tidal current asymmetry of flood and ebb in this region.Moreover,further examination of the tidal current duration and residual currents revealed that the monthly mean flood and ebb duration were 6 h 1 min 30 s and 6 h 19 min 58 s,respectively,which suggests that the flood current dominates the study area and that the subsequent asymmetry of flood and ebb may facilitate further expansion of tidal flats in this region.