Limitations of empirical sediment transport formulas for shallow water and their consequences for swash zone modelling

Limitations of empirical sediment transport formulas for shallow water and their consequences for swash zone modelling
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浅水沉积物输运经验公式的局限性及其对冲沙带建模的影响

DOI:
10.1080/00221686.2016.1212942
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发表时间:
2016-08
影响因子:
2.3
通讯作者:
Zhixian Cao
Zhixian Cao
中科院分区:
工程技术3区
文献类型:
--
作者:
Wei Li;Peng Hu;Thomas Pahtz;Zhiguo He;Zhixian Cao

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在用标准公式计算输沙速率时,相分辨泥沙形态动力学模型计算的体积含沙量比单位减去孔隙度(即物理上可能的最大浓度值)高出105倍。引入了泥沙浓度的特殊限制,作为一种通过标准表达式评估超过实际泥沙浓度的后果的方法。我们发现,这一特殊极限的实施强烈地改变了相分辨swash地貌动力学模型的定量和定性预测,表明现有的swash预测是不可靠的。这是因为标准表达式不适当地考虑或忽略了这样一个事实,即浅水冲刷水深限制了所输送泥沙的存储能力。
ABSTRACT Volumetric sediment concentrations computed by phase-resolving swash morphodynamic models are shown to exceed unity minus porosity (i.e. the maximal physically possible concentration value) by up to factor of 105 when using standard expressions to compute the sediment transport rate. An ad hoc limit of sediment concentration is introduced as a means to evaluate consequences of exceeding physically realistic concentration by standard expressions. We find that implementation of this ad hoc limit strongly changes the quantitative and qualitative predictions of phase-resolving swash morphodynamic models, suggesting that existing swash predictions are unreliable. This is because standard expressions inappropriately consider or ignore the fact that the shallow swash water depth limits the storage capacity of transported sediment.
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