ON THE BOTTOM SHEAR STRESS DURING LONG WAVE RUNUP AND BACKWASH
ON THE BOTTOM SHEAR STRESS DURING LONG WAVE RUNUP AND BACKWASH
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长波上升和反冲洗过程中底部剪切应力的研究
DOI：
10.9753/icce.v32.currents.47
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发表时间：
2011
影响因子：
4.4
通讯作者：
Teppei Mishima
中科院分区：
文献类型：
--
作者：
T. Shimozono;A. Okayasu;Teppei Mishima
通过实验研究了破碎孤立波爬高和爬高过程中的流动特性。采用LDV在静止海岸线向陆地的两个位置，在不同的底床条件下测量了边界层流动。用不同的方法从近床流速剖面估算了海底切应力随时间的变化。通过对数拟合确定的剪切应力大致同意推导出的深度积分动量平衡在湍流阶段。在助跑和加速的活动阶段期间的摩擦系数在大小上相似，除了在值急剧增加的前尖端。在相同几何条件下进行了动床试验，探讨了底切应力与泥沙输移的关系。结果表明，床变形的大小和施加的剪切应力的持续时间明显的依赖性。
Laboratory experiments were performed to examine flow characteristics during runup and backwash of a breaking solitary wave. Boundary layer flows were measured by LDV at two locations landward of the still shoreline under different bed conditions. Temporal variations of the bottom shear stress were estimated from nearbed velocity profiles with different methods. The shear stress determined through the logarithmic fitting roughly agreed with that deduced from a depth-integrated momentum balance during turbulent flow phases. The friction factors during the active phases of the runup and backwash were similar in magnitude except in the leading tip where the value sharply increased. A movable bed experiment was also carried out under the same geometry to discuss relations between the bottom shear stress and sediment transport. The result indicated clear dependencies of bed deformations on the magnitude and duration of the exerted shear stress.
影响因子：
4.4
作者：
Barnes, M. P.;O'Donoghue, T.;Baldock, T. E.
通讯作者：
Baldock, T. E.