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首页> 外文期刊>Ocean Dynamics >Tidal flow asymmetry in the diurnal regime: bed-load transport and morphologic changes around the Red River Delta
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Tidal flow asymmetry in the diurnal regime: bed-load transport and morphologic changes around the Red River Delta

机译：昼间潮汐流量不对称：红河三角洲周围的河床负重运输和形态变化

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摘要

The relation between tidal flow asymmetry and net transport of sediment in the semidiurnal regime has been extensively described. This study reveals that in the diurnal regime, the direction of long-term net bed-load transport and resulting morphologic changes is partly determined by the phase-angle relationship of O_1, K_1, and M_2. Simple analytical formulations of time-averaged bed-load transport were derived which separate the relative contributions of tidal asymmetry from that of residual flow with tidal stirring. In this particular case, the Red River Delta in Vietnam, transports related to tidal asymmetry are larger than those induced by the monsoon currents, and are an order of magnitude larger than those associated with topographic residual flow around the delta. Tide-induced morphologic changes dominate at water depths between 10 and 25 m, of which the patterns of erosion and deposition overlap with observed bathymetric changes. Additional observed changes that occur in more shallow water cannot be explained by tidal asymmetry and are probably related to wave action and to deposition from the buoyant river plume.
机译：在半日制中，潮汐流量不对称性与泥沙净输送之间的关系已得到广泛描述。这项研究表明，在日间模式下，长期净床载运移的方向和由此引起的形态变化部分取决于O_1，K_1和M_2的相位角关系。推导出了时间平均床载运输量的简单分析公式，该公式将潮汐不对称的相对贡献与潮汐搅拌下的剩余流量的相对贡献分开了。在这种特殊情况下，越南的红河三角洲，与潮汐不对称有关的输运量比季风流引起的输运量大，并且比与三角洲周围的地形残留流有关的输运量大一个数量级。潮汐引起的形态变化在10至25 m的水深处占主导地位，其中侵蚀和沉积的模式与观测到的测深变化重叠。潮汐的不对称性无法解释在更浅水域中发生的其他观测变化，这可能与波浪作用和浮力河羽的沉积有关。

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