| 摘要: |
| 基于2008 年3 月份在南黄海辐射沙脊群西洋水道内5 个站位大潮期间的观测数据(包括流速与悬沙质量浓度的垂向剖面), 利用机制分解法计算了西洋水道内的水与悬沙通量。结果表明, 水体在多数时段内均处于分层向混合过渡的状态, 中下层水体的理查德森数(Ri)与瞬时悬沙输运量中的平均流输沙项及流速的潮周期变化相关项之间存在显著的负相关关系, 表明水体的层化效应和混合程度对悬沙输运有重要影响。西洋水道内悬沙净输运率为10-1～100 kg/(m·s)量级, 并以欧拉余流向岸输运为主,该结果揭示了苏北近岸潮滩在陆源物质供应减少背景下向海快速淤长的重要物质基础和水动力作用机制。 |
| 关键词: 悬沙质量浓度 通量分解 理查德森数 西洋水道 |
| DOI： |
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| 基金项目:国家自然科学基金(40576040, 40876043) |
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| Mechanism of water and suspended sediment transport in the Xiyang Channel along the southwestern Yellow Sea coast |
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| Abstract: |
| Based on the sediment dynamics measurement of water levels, current velocities, and suspended sediment concentrations at five stations in the Xiyang Channel along the southwestern coast of the Yellow Sea in March 2008, the water and the suspended sediment transport fluxes were calculated by the flux decomposition method. The results show that the water is in the transition from stratification to mixing during tidal cycles according to the Richardson number Ri. Moreover, a significant negative correlation is present between Ri and advection term (and the current velocity variations during tidal cycles). In addition, net transport rate of the suspended sediment is in the magnitude of 10-1～100 kg/(m·s). The suspended sediment transport is dominated by the Eulerian effect, towards the western coast, which plays an important role on the progradation of the adjoining tidal flats. |
| Key words: suspended sediment concentration flux decomposition Richardson number the Xiyang Channel |
