Sediment transport partitioning in the swash zone of a large-scale laboratory beach
Sediment transport partitioning in the swash zone of a large-scale laboratory beach
复制标题
DOI：
10.1016/j.coastaleng.2015.11.001
复制
发表时间：
2016-07
影响因子：
4.4
通讯作者：
J. Puleo;T. Lanckriet;D. Conley;Diane Foster
中科院分区：
文献类型：
--
作者：
J. Puleo;T. Lanckriet;D. Conley;Diane Foster
在大型波浪水槽中模拟了粗砂海滩的冲浪区薄层流和悬沙输移率。分析了三个试验案例下的单色波，波高为0.74米，波周期为8和12.2秒。在上冲和反冲洗期间，片流层中的沉积物通量超过数百kg m-2s-1。上冲期间悬浮泥沙通量很大，可超过200 kg m− 2s− 1。瞬时泥沙通量幅值在片层几乎总是大于悬浮泥沙通量。然而，输沙率，那些集成的深度，表明悬浮负荷运输是占主导地位的上冲过程中的所有情况下，在早期阶段，除了在12.2 s波的情况下，前滨是陡峭的。无法获得整个冲流事件的结果，尤其是在水深低于最低流速计高程的情况下，冲流期间的结果被截断。
Swash zone sheet flow and suspended sediment transport rates are estimated on a coarse sand beach constructed in a large-scale laboratory wave flume. Three test cases under monochromatic waves with wave heights of 0.74 m and wave periods of 8 and 12.2 s were analyzed. Sediment flux in the sheet flow layer exceeds several hundred kg m− 2s− 1during both uprush and backwash. Suspended sediment flux is large during uprush and can exceed 200 kg m− 2s− 1. Instantaneous sediment flux magnitudes in the sheet layer are nearly always larger than those for suspended sediment flux. However, sediment transport rates, those integrated over depth, indicate that suspended load transport is dominant during uprush for all cases and during the early stages of backwash except in the case for the 12.2 s wave case when the foreshore was steeper. Results could not be obtained for an entire swash event and were particularly truncated during backwash when water depths fell below the elevation of the lowest current meter.