3-D simulation of the suspended sediment transport in the Yellow River mouth I: Shear front off the Yellow River mouth
3-D simulation of the suspended sediment transport in the Yellow River mouth I: Shear front off the Yellow River mouth
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发表时间：
2006
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通讯作者：
Bi Nai-shuang
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作者：
Bi Nai-shuang
采用三维数值模式对黄河口悬沙输运进行了数值模拟，并通过现场实测资料进行了验证，揭示了剪切锋的时空变化规律及其对悬沙输运的影响，在涨、落潮阶段，剪切锋存在两种类型，每种类型持续时间为2h，结果表明，剪切锋产生于浅水区，剪切锋的产生似乎是由于浅水区的潮汐相位超前于深水区的潮汐相位约2小时所致，有趣的是，剪切锋的产生是由于浅水区的潮汐相位超前于深水区的潮汐相位约2小时所致，剪切锋的产生是由于浅水区的潮汐相位超前于深水区的潮汐相位约2小时所致。对悬沙的向海输运起到了拦河坝的作用，将河流泥沙输运限制在剪切锋内，沿着向北的落潮流，水深资料表明，剪切锋的向陆侧形成了沉积带，向海侧形成了侵蚀带，这是剪切锋对黄河口长期地貌演化的重要地貌响应。
A 3-D numerical model was used to simulate the suspended sediment transport in the Yellow River mouth and verified by the in-situ measurements.The temporal-spatial variation of the shear front was revealed from the numerical results,as well as its effects on the suspended sediment transport.Two patterns of the shear front,each of which lasts for 2 hours,were identified at the flood and ebb tide phases,respectively.The results suggested that the shear front be generated in the shallow area,then moved seaward and finally disappeared 2 hours later.It seemed that the generation of the shear front was resulted from the phase leading of the tides in the shallow area to that in the deep area by about 2 hours.It was interestingly indicated that the shear front acted as a barrage to the seaward transport of the suspended sediment,retaining the river sediment transport inside the shear front along the northward ebb current.The bathymetric data indicated that a deposition zone was formed in the landward side of the shear front together with erosion zone in its seaward side,which can be regarded as an important geomorphological response of the shear front to the long-term geomorphological evolution of the Yellow River mouth.