Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 2. Numerical simulations
Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 2. Numerical simulations
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2009年旱季中国长江口深水航道的悬浮泥沙输送：2.数值模拟
DOI：
10.1002/jgrc.20411
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发表时间：
2013-10
影响因子：
--
通讯作者：
Xiao Hua Wang
中科院分区：
文献类型：
--
作者：
Dehai Song;Xiao Hua Wang
为了解长江口北航道深水航道--中国深水航道的水动力和泥沙运动动力学，建立了考虑干湿过程的三维波-流-沙耦合数值模型。模型结果与观测数据吻合较好，统计结果显示模型技能得分和相关系数较好。该模式较好地模拟了混合良好的河口和层结程度较高的河口之间的大潮变化。模式结果表明，河口重力环流对DNC河口最大浑浊带(ETM)的形成起着最重要的作用。上游非局部泥沙通过溢流机制的侵入是北槽形态变化后泥沙滞留的主要来源。进行了数值研究，以显示在不同强迫(河流流量、海浪和风)影响下的Yre情景。在这些研究案例中，面波破碎解除了泥沙的截留，底波流相互作用加剧了河床侵蚀，提高了ETM中的悬沙浓度，前者和后者对DNC中悬浮泥沙输移的影响最小和最大。风的作用对泥沙滞留的影响大于河流的排沙量，稳定的西北风条件最有利于DNC的淤积。对密度驱动浑浊流的意义进行了评价，认为密度驱动浑浊流可以增强咸水入侵，抑制底边界层的湍流混合。
A three‐dimensional wave‐current‐sediment coupled numerical model with wetting and drying process is developed to understand hydrodynamics and sediment transport dynamics in the Deepwater Navigation Channel (DNC), the North Passage of the Yangtze River Estuary (YRE), China. The model results are in good agreement with observed data, and statistics show good model skill scores and correlation coefficients. The model well reproduces the spring‐neap variation between a well‐mixed estuary and a highly stratified estuary. Model results indicate that the estuarine gravitational circulation plays the most important role in the estuarine turbidity maximum (ETM) formation in the DNC. The upstream nonlocal sediment intrusion through the spillover mechanism is a major source of sediment trapping in the North Passage after the morphological changes. Numerical studies are conducted to show scenarios in the YRE under the effects of different forcings (river discharges, waves, and winds). Between these study cases, surface‐wave‐breaking relieves the sediment trapping and bottom‐wave‐current‐interaction aggravates the bed erosion and elevates the SSC in the ETM; the former and the latter have the least and largest influence on the suspended sediment transport in the DNC. The wind effects have a greater influence on sediment trapping than the river discharges, and the steady northwesterly wind condition favors the siltation in the DNC most. The significance of density‐driven turbidity current is also assessed, which can enhance the saline‐water intrusion and suppress the turbulent mixing in the bottom boundary layer.
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影响因子：
2.3
作者：
S. Talke;H. Swart;H. Schuttelaars
通讯作者：
S. Talke;H. Swart;H. Schuttelaars
影响因子：
3.6
作者：
DYER, KR
通讯作者：
DYER, KR
DOI：
10.1007/s11707-008-0043-8
发表时间：
2008-06
期刊：
Frontiers of Earth Science in China
影响因子：
--
作者：
J. Gao;Yang Yang-Yang;Ya Wang;S. Pan;Rui Zhang
通讯作者：
J. Gao;Yang Yang-Yang;Ya Wang;S. Pan;Rui Zhang
DOI：
10.9753/icce.v24
发表时间：
1995
期刊：
--
影响因子：
--
作者：
Tai Wen Hsu;Hsien-Kuo Chang
通讯作者：
Tai Wen Hsu;Hsien-Kuo Chang
影响因子：
2.3
作者：
Fanghua Xu;Dong-Ping Wang;N. Riemer
通讯作者：
Fanghua Xu;Dong-Ping Wang;N. Riemer