Vortex-induced suspension of sediment in the surf zone
Vortex-induced suspension of sediment in the surf zone
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涡流引起的海浪区沉积物悬浮
DOI：
10.1016/j.advwatres.2017.08.021
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发表时间：
2017
影响因子：
4.7
通讯作者：
Watanabe Yasunori
中科院分区：
文献类型：
--
作者：
Otsuka Junichi;Saruwatari Ayumi;Watanabe Yasunori
通过物理和计算实验，确定了破碎波作用下碎波带中产生的有组织涡旋是泥沙悬浮的主要机制。在相邻的初级滚柱涡之间产生的斜降涡内的反向旋转流动引起横向收敛的近床流动，驱动推移质输运形成规则的横向沉积模式。沉积的沉积物然后被涡之间引起的向上的载体流快速喷射。实验证据支持这种涡致悬浮的机制，即在破碎波阵面经过后，倾斜下降的涡流到达海床的地方，喷射出连贯的沉积物云。根据涡量动力学和破碎波中横向流动的参数特性，将破碎波引起的泥沙沉降和湍流扩散的影响纳入悬浮体模型中。这里提出的模型合理地预测了指数衰减的测量泥沙浓度由于猛烈的暴跌波，显着改善了以前的模型产生的浓度预测不足。
A major mechanism of sediment suspension by organized vortices produced under violent breaking waves in the surf zone was identified through physical and computational experiments. Counter-rotating flows within obliquely descending eddies produced between adjacent primary roller vortices induce transverse convergent near-bed flows, driving bed load transport to form regular patterns of transverse depositions. The deposited sediment is then rapidly ejected by upward carrier flows induced between the vortices. This mechanism of vortex-induced suspension is supported by experimental evidence that coherent sediment clouds are ejected where the obliquely descending eddies reach the sea bed after the breaking wave front has passed. In addition to the effects of settling and turbulent diffusion caused by breaking waves, the effect of the vortex-induced flows was incorporated into a suspension model on the basis of vorticity dynamics and parametric characteristics of transverse flows in breaking waves. The model proposed here reasonably predicts an exponential attenuation of the measured sediment concentration due to violent plunging waves and significantly improves the underprediction of the concentration produced by previous models.
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