Cross-shore redistribution of nourished sand near a breaker bar
Cross-shore redistribution of nourished sand near a breaker bar
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DOI：
10.1061/(asce)ww.1943-5460.0000233
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
N. Jacobsen;J. Fredsøe
中科院分区：
文献类型：
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作者：
N. Jacobsen;J. Fredsøe
摘要本文研究了在有栅栏的海岸线上倾倒营养沙的最佳位置。这是通过调查短期行为的跨海岸重新分配营养沉积物上的破碎机酒吧剖面在一个二维的垂直平面。这是通过使用一个完整的数值描述的冲浪区过程相对于流体动力学和沉积物输运。数值模型是基于有限体积法与自由表面跟踪方法，也被称为流体体积（VOF），和泥沙输运计算应用Engelund和Fredsoe确定性概念。方法如下：Dean/Bruun平衡剖面暴露于规则波（选择为H=1.3 m和T=4.8 s）。这些波浪将在Dean/Bruun平衡剖面上形成杆，并且波浪冲击继续，直到获得杆的准稳定行为，即，已经停止生长的沙洲，只能缓慢地迁移到外海。
AbstractThis paper focuses on the optimal location for dumping nourished sand on a barred coastline. This is done by investigating the short-term behavior of the cross-shore redistribution of nourished sediment on a breaker-bar profile in a two-dimensional vertical plane. This is achieved by the use of a complete numerical description of the surf-zone processes with respect to both hydrodynamics and sediment transport. The numerical model is based on the finite-volume approach with a free surface-tracking method, also known as the volume of fluid (VOF), and the sediment transport is calculated applying the Engelund and Fredsoe deterministic concept. The methodology is as follows: a Dean/Bruun equilibrium profile is exposed to regular waves (chosen as H=1.3 m and T=4.8 s). These waves will form bars on the Dean/Bruun equilibrium profile, and the wave impact is continued until a quasi-steady behavior of the bars has been obtained, i.e., bars that have stopped growing in height and only migrate slowly offsho...