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首页> 外文期刊>Journal of hydroscience and hydraulic engineering >INFLUENCE OF TIDAL RANGE AND RIVER DISCHARGE ON TRANSPORT OF SUSPENDED SEDIMENT IN THE OHTA FLOOD-WAY
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INFLUENCE OF TIDAL RANGE AND RIVER DISCHARGE ON TRANSPORT OF SUSPENDED SEDIMENT IN THE OHTA FLOOD-WAY

机译：潮汐河段和河道流量对大田河洪道悬浮泥沙运输的影响

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Long-duration observations of tidal currents, stratification, and suspended sediments (SS) were conducted in the Ohta flood-way to clarify the characteristics of SS transport in a tidal estuary where flow and density conditions change significantly. Deployment periods of up to 3 months allowed us to examine the effect of a flood incident and both semi-diurnal and neap/spring aspects of tides. The data revealed a semi-diurnal stratification cycle driven by tidal straining of freshwater-induced horizontal density gradient, i.e., the stratification during the ebb is stronger than that during the flood. As a result, the data of current profilers show that the velocity distribution during the ebb deviates from logarithmic law. The tidal straining and the nonlinearity of tidal wave mainly bring about the asymmetry of tidal current and bottom shear-stress. The SS transport intermittently occurs, and most of it occurs just before and after lower low water slack. Moreover, it was found out that the long term variation of SS transport is related to river discharge and to the tidal range. Peaks of the SS transport on the flood tide are higher than those on the ebb tide during the spring tide. Spatial variation of SS transport is examined from observations at three longitudinal measurement positions, which are located at about 2.8km, 5.8km and 8.8km upstream from the mouth. Additional surveys were made to examine particle size distributions of the tidal flat sediment.
机译：在Ohta洪水路进行了长期的潮汐流，分层和悬浮沉积物（SS）观测，以弄清潮汐河口SS迁移的特征，潮汐河口的流量和密度条件发生了显着变化。长达3个月的部署期使我们能够检查洪水事件的影响以及潮汐的半日和潮汐/潮汐方面。数据显示，淡水引起的水平密度梯度的潮汐应变驱动了半日的分层循环，即退潮期间的分层强于洪水期间的分层。结果，电流廓线仪的数据表明，退潮期间的速度分布偏离了对数定律。潮汐应变和潮汐波的非线性主要导致潮汐流和底切应力的不对称性。 SS传输是间歇性发生的，大部分发生在较低的低水位松弛前后。此外，还发现SS运输的长期变化与河流流量和潮汐范围有关。春季潮期间，SS的运输高峰高于退潮时期。从三个纵向测量位置的观测中检查了SS运输的空间变化，这些位置位于口上游约2.8km，5.8km和8.8km处。进行了其他调查以检查潮滩沉积物的粒径分布。

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