用离散元法模拟风沙输运中垂直粒度分选过程

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2022-08-01 DOI:10.1016/j.aeolia.2022.100817
G.H.P. Campmans, K.M. Wijnberg
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引用次数: 0

摘要

我们提出了一个风沙跃迁过程的模型研究,其中研究了沉积物样品的尺寸选择运输过程。采用离散元法对不同粒径的泥沙颗粒进行模拟,并结合流体边界层模型来获取驱动风力。模拟了中位粒径相同但粒径分布有系统变化的泥沙样品,研究了不同风切变速率下泥沙组分的输运情况。模型结果与其他研究结果一致,表明中位粒径是衡量输沙总速率的合适泥沙样本参数。然而,我们的结果表明,这并不能决定泥沙的哪些部分在运输中。泥沙粒径分布的标准差越大,输运泥沙的中位粒径就越小,与床上存在的中位粒径相比就越小。
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Modelling the vertical grain size sorting process in aeolian sediment transport using the discrete element method

We present a model study of the aeolian saltation process where sediment samples are studied for the size selective transport processes. The discrete element method is used to simulate the sediment particles of different sizes, coupled with a fluid boundary layer model to capture the driving wind forces. Sediment samples with identical median grain size, but with systematically varying size distributions were simulated to investigate under various wind shear rates which sediment fractions are transported. The presented model results show - well in line with other research - that the median grain size is an appropriate sediment sample parameter to quantify the total rate of sediment transport. However, our results show that this does not determine what fractions of sediment are in transport. The larger the standard deviation in the sediment size distribution the smaller the median grain size becomes of the sediment that is in transport compared to the median grain size present at the bed.

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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
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