A Novel Framework for Simulating Particle Deposition With Moving Bedforms
A Novel Framework for Simulating Particle Deposition With Moving Bedforms
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DOI：
10.1029/2021gl097223
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发表时间：
2022-02
影响因子：
5.2
通讯作者：
Y. Teitelbaum;T. Shimony;Edwin Saavedra Cifuentes;J. Dallmann;Colin B. Phillips;A. Packman;Scott K. Hansen;S. Arnon
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文献类型：
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作者：
Y. Teitelbaum;T. Shimony;Edwin Saavedra Cifuentes;J. Dallmann;Colin B. Phillips;A. Packman;Scott K. Hansen;S. Arnon
以前的模拟研究所引起的移动底形的潜流交换使用了移动参考系，通常对应于一个单独的移动底形。然而，这种方法不适用于模拟移动床型下固定细颗粒的交换和积累，这通常发生在砂床流中，因为必须考虑移动和静止特征。在这里，我们提出了一种新的模拟框架，可以表示任意形状，一般非周期性的移动的底形内的一个固定的参考系。我们将联合收割机这种方法与颗粒跟踪相结合，成功地再现了砂床中粘土沉积的观察结果，以及冲刷区附近低电导率层的形成。研究发现，床型膨胀和滤失的增加均导致粘土沉积深度变浅，沉积层变致密。虽然增加的过滤导致更多的粘土存款，但增加的硅藻土通过使低流交换流路变平而减少沉积。
Previous modeling studies of hyporheic exchange induced by moving bedforms have used a moving reference frame, typically corresponding to an individual moving bedform. However, this approach is not suitable for simulating the exchange and accumulation of immobile fine particles beneath moving bedforms, which commonly occurs in sand‐bed streams, as both moving and stationary features must be considered. Here we present a novel simulation framework that may represent arbitrarily shaped, generally aperiodic mobile bedforms within a stationary reference frame. We combine this approach with particle tracking to successfully reproduce observations of clay deposition in sand beds, and the resulting development of a low‐conductivity layer near the scour zone. We find that increased bedform celerity and filtration both lead to a shallower depth of clay deposition and a more compact deposition layer. While increased filtration causes more clay to deposit, increased celerity reduces deposition by flattening hyporheic exchange flowpaths.