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| DOI | 10.1016/j.advwatres.2020.103659 |
| Experimental observations on fine sand winnowing from immobile gravel substrate | |
| Khademishamami M.; Nardin W. | |
| 发表日期 | 2020 |
| ISSN | 0309-1708 |
| 卷号 | 142 |
| 英文摘要 | Introduction of fine sand into gravel-bed rivers has surged tremendously as a result of human activities. The ecological concerns for river habitats have called for suitable management strategies for cleaning these particles from gravel bed rivers. This paper is concerned with determining movement threshold of fine sand initially entrapped in the spaces between large immobile elements resembling a coarse riverine substrate with flow depths comparable to non-erodible element sizes. Static equilibrium condition was reached during an experimental run by maintaining a zero-supply condition for sand. It was assumed that the flow condition corresponding to this sand level was representative of critical conditions for onset of sand motion. A nonlinear regression curve was fitted between the level of the sand and associated critical shear stress. The flow field measurements using an ultrasonic Doppler rofiler delineate main features of the shallow flow over large roughness elements such as sharp velocity gradients near the crest of the immobile elements, and also a deviation of instantaneous velocity probability density function from normal distribution very close to the sand level. © 2020 |
| 关键词 | GravelNormal distributionProbability density functionRiversShear stressCritical shear stressFlow field measurementManagement strategiesMovement thresholdNon-linear regressionRoughness elementsStatic equilibrium conditionsVelocity gradientsSandexperimental studyflow fieldflow velocityfluvial depositgravelmovementregression analysissandsediment transportsubstratethreshold |
| 语种 | 英语 |
| 来源机构 | Advances in Water Resources |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/131759 |
| 推荐引用方式 GB/T 7714 | Khademishamami M.,Nardin W.. Experimental observations on fine sand winnowing from immobile gravel substrate[J]. Advances in Water Resources,2020,142. |
| APA | Khademishamami M.,&Nardin W..(2020).Experimental observations on fine sand winnowing from immobile gravel substrate.,142. |
| MLA | Khademishamami M.,et al."Experimental observations on fine sand winnowing from immobile gravel substrate".142(2020). |
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