Low Sediment Transport Rates Over Flat Beds
Low Sediment Transport Rates Over Flat Beds
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平床上沉积物输送率低
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
P. Mantz
中科院分区：
文献类型：
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作者：
P. Mantz
由轻质塑料圆盘组成的平坦泥沙床在两种水流条件下铺设，随后作为推移质侵蚀。较低的输沙率与施加的流体剪切力增加有关，并与两种铺床条件或初始床层稳定条件不同。这些结果是无量纲化的，以便能够应用于野外情况，并与以前使用自然密度、近球形颗粒作为沉积物的研究进行比较。利用孤立圆盘运动的研究结果和以往水流作用下孤立颗粒的研究结果，选择尺度参数进行无量纲分析。最后给出了在给定的低输沙率和床层稳定性或装甲条件下预测临界无因次剪应力的通用曲线。
Flat sediment beds composed of lightweight plastic discs were laid under two conditions of water flow, and subsequently eroded as bed load. The low sediment transport rates were correlated with the increasingly applied fluid shear stress, and shown to differ with the two bed laying or initial bed stability conditions. These results were non-dimensionalized to enable application to field situations and comparison with previous studies which used natural density, near-spherical grains as the sediment. Scale parameters were chosen for the dimensionless analysis using the results of a study on the motion of solitary discs and previous solitary grain studies under water flow. Universal curves were finally proposed for predicting a critical dimensionless shear stress at a given low transport rate and bed stability or armoring condition.