Relative Contributions of Bed Load and Suspended Load to Sediment Transport Under Skewed‐Asymmetric Waves on a Sandbar Crest
Relative Contributions of Bed Load and Suspended Load to Sediment Transport Under Skewed‐Asymmetric Waves on a Sandbar Crest
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沙洲顶斜非对称波作用下床质荷载和悬荷载对泥沙输移的相对贡献
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
J. Calantoni
中科院分区：
文献类型：
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作者：
R. Mieras;J. Puleo;Dylan L. Anderson;T. Hsu;D. Cox;J. Calantoni
进行了一项大型室内试验，以评估在侵蚀和增生场尺度波浪条件下沙洲上的跨海岸泥沙输运和床面响应（共11个案例）。通过使用电导率浓度剖面仪和微型光纤反向散射剖面仪，实现了前所未有的沉积物浓度垂直分辨率。观测了沙洲顶部水柱下半部分的波内（相位平均）和波平均横向海岸沉积物流速分布和输运速率。将净输沙率分为悬沙和推移质两个分量，定量分析悬沙和推移质对总输沙率的相对贡献。在11例病例中，6例病例的阳性（波峰）半周期的净SS转运率大于净BL转运率，而阴性（波谷）半周期的净SS转运率为100%（11例）。11例中有7例的净（波平均）BL转运率在幅度上大于净SS转运率。运输的主导模式是由净BL净SS运输速率幅度的比值确定的。当SS占主导地位时，净运输率为负（离岸方向），当BL占主导地位时，净运输率为正（陆上方向）。净BL传输速率相关
A large ‐ scale laboratory experiment was conducted to evaluate cross ‐ shore sediment transport and bed response on a sandbar under erosive and accretive fi eld ‐ scale wave conditions (total of 11 cases). Unprecedented vertical resolution of sediment concentration was achieved through the use of conductivity concentration pro fi lers alongside miniature fi ber optic backscatter pro fi lers. Observations were made of intrawave (phase ‐ averaged) and wave ‐ averaged cross ‐ shore sediment fl ux pro fi les and transport rates in the lower half of the water column on the crest of a sandbar. The net sediment transport rate was partitioned into suspended sediment (SS) and bed load (BL) components to quantify the relative contributions of SS and BL to the total sediment transport rate. Net SS transport rates were greater than net BL transport rates for the positive (wave crest) half ‐ cycle in 6 of 11 cases, compared to 100% (11 of 11) for the negative (wave trough) half ‐ cycle. Net (wave ‐ averaged) BL transport rates were greater, in magnitude, than net SS transport rates for 7 of the 11 cases. The dominant mode of transport was determined from the ratio of net BL to net SS transport rate magnitudes. The net transport rate was negative (offshore ‐ directed) when SS dominated and positive (onshore ‐ directed) when BL dominated. Net BL transport rate correlated
影响因子：
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作者：
A. DominicA.vander;J. Zanden;T. O'Donoghue;D. Hurther;I. Cáceres;S. McLelland;J. Ribberink
通讯作者：
A. DominicA.vander;J. Zanden;T. O'Donoghue;D. Hurther;I. Cáceres;S. McLelland;J. Ribberink
DOI：
10.1061/(asce)ww.1943-5460.0000209
发表时间：
2014-01-01
影响因子：
2.2
作者：
Lanckriet, Thijs;Puleo, Jack A.;Russell, Paul
通讯作者：
Russell, Paul