Fractional dispersion equation for sediment suspension
文献类型：EI期刊论文
| 作者 | Zhang Yong; Chen Dong |
| 发表日期 | 2013 |
| 关键词 | Suspended sediments Advection Brownian movement Dispersions Sedimentology Turbulence |
| 英文摘要 | This study proposes a stochastic approach to simulate sediment vertical dispersion in turbulent solid-liquid flows by developing a fractional advection-diffusion equation (fADE) to characterize the dynamics of sediment suspension. The fADE is a generalization of the traditional advection-diffusion equation (ADE) where the first-order spatial derivative is replaced with a fractional derivative of order (0. <. . 1). Many previous investigations of sediment suspension in steady sediment-laden flows apply the classic or improved Rouse equation, which was derived from the traditional ADE by assuming Fick's first law for the sediment dispersive flux. Recent observations in field and laboratory studies, however, have indicated that large errors may arise from the traditional ADE when applied to flows with coarse sediments. Instead, the vertical dispersion of suspended sediment is most likely a space nonlocal transport process in flows with turbulent bursting because particle vertical jumps with ejection events are no longer constrained to a small distance defined by the representative elementary volume. In other words, the vertical random displacements of suspended particles follow Levy motion instead of Brownian motion. After validating against field measurements in the Las Vegas Wash as well as a set of published experimental data, we find that the proposed fractional model can describe the real-world vertical distribution of suspended sediment concentration in steady turbulent flows. 2013 Elsevier B.V. |
| 出处 | Journal of Hydrology
 |
| 卷 | 491期:1页:13-22 |
| 收录类别 | EI |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/31237]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang Yong,Chen Dong. Fractional dispersion equation for sediment suspension. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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