冰覆盖下被淹没的斜角直堤周围的局部冲刷

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Guowei Li, Jueyi Sui, Sanaz Sediqi, Mauricio Dziedzic
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引用次数: 0

摘要

局部冲刷是指泥沙输运不平衡导致河床局部下沉的现象。当岩脉突入天然河道时,可能会引发局部冲刷。准确估算围堤局部冲刷量,对有效防治侵蚀和改善生境措施至关重要。在本研究中,研究了最大冲刷深度与过顶比、直堤尺寸、冰盖粗糙度和床料粒度之间的关系。在明渠和覆冰两种工况下,采用不同的试验装置,在大型室外水槽中进行了多种试验。结果表明:随着密度弗劳德数的增加,冲淤深度随着冲淤比和冲淤角的减小而增大;水下斜立墙直堤周围的最大冲刷深度受水面覆冰的显著影响,即水面覆冰越粗糙,冲刷孔越深。在室内试验数据的基础上,对现有的最大冲刷深度估计方程进行了修正,考虑了覆盖条件和淹没水平的影响。计算结果表明,对实测数据的估计精度较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Local scour around submerged angled spur dikes under ice cover

Local scour is a phenomenon leading to the localized lowering of the channel bed due to the imbalance of sediment transport. As spur dikes protrude into the natural channels, local scour could be triggered. Accurate estimation of local scour around spur dikes is crucial for the effectiveness of erosion control and prevention and habitat enhancement measures. In the current study, the correlations between the maximum scour depth and the overtopping ratio, spur dike dimensions, ice cover roughness, and grain size of the bed material are investigated. Under both open channel and ice-covered flow conditions, a variety of experiments were done in a large-scale outdoor flume with different experimental setups. The results revealed that the scour depths around submerged spur dikes increased with increases in the densimetric Froude number and the decreases in the overtopping ratio and alignment angle. The maximum scour depth around a submerged angled vertical wall spur dike is significantly affected by the presence of an ice cover on the water surface, namely, the rougher the cover, the deeper the scour hole. Based on data collected from the laboratory experiments, an existing maximum scour depth estimation equation has been modified to consider the influence of the cover condition and the submergence level. The calculated results showed high accuracy in estimation of the measured data.

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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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