A new remote predictor of wave reflection based on runup asymmetry
A new remote predictor of wave reflection based on runup asymmetry
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DOI：
10.1016/j.ecss.2018.10.018
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
R. Almar;C. Blenkinsopp;L. Almeida;P. Catalán;E. Bergsma;R. Cienfuegos;N. Viet
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文献类型：
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作者：
R. Almar;C. Blenkinsopp;L. Almeida;P. Catalán;E. Bergsma;R. Cienfuegos;N. Viet
反射波占近岸能量收支的很大一部分，并影响来波、近岸环流和泥沙输送。在三种不同的海滩上，从高反射到耗散，研究了使用swash参数估计海浪反射的情况。据观察，在估计反射时，特别是在海滩面陡峭的中等和反光海滩上，必须考虑水花过程。我们的结果表明，上冲/反冲洗中的RUP不对称性可以用来替代SWASH区的耗散：更大的不对称值表示更大的耗散。在我们的数据集中，与基于冲浪相似性的经验预报器相比，基于冲浪不对称性的反射预报器具有更好的技巧，因为冲浪是一个综合了冲浪和波浪波动变换的过程。爬升不对称性表现为一个激荡相似参数，反映了激荡周期、斜率和耗散之间的平衡。
Reflected waves account for a significant part of the nearshore energy budget and influence incoming waves, nearshore circulation and sediment transport. The use of swash parameters to estimate wave reflection is investigated at three different beaches ranging from highly reflective to dissipative. It is observed that it is essential to account for swash processes when estimating reflection, in particular at intermediate and reflective beaches with a steep beachface. Our results show that runup asymmetry in uprush/backwash can be used as a proxy for dissipation in the swash zone: larger asymmetry values indicating greater dissipation. In our dataset, a reflection predictor based on runup asymmetry has better skill in comparison to empirical predictors based on surf similarity, because runup is a process that integrates both surf and swash zone wave transformation. Runup asymmetry behaves as a swash similarity parameter and reflects an equilibrium between swash period, slope and dissipation.