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Individual wave overtopping volumes on mound breakwaters in breaking wave conditions and gentle sea bottoms
Coastal Engineering ( IF 4.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.coastaleng.2020.103703
Patricia Mares-Nasarre , Jorge Molines , M. Esther Gómez-Martín , Josep R. Medina

Abstract Mound breakwaters are usually designed to limit the mean wave overtopping rate (q) or the maximum individual wave overtopping volume (Vmax). However, rarely do studies focus on wave overtopping volumes on breakwaters in depth-limited breaking wave conditions. This study analyzes 2D physical tests on mound breakwaters with relevant overtopping rates (0.33 ≤ Rc/Hm0 ≤ 2.83) and three armor layers (Cubipod®-1L, rock-2L and cube-2L) in depth-limited breaking wave conditions (0.20 ≤ Hm0/hs ≤ 0.90) and with two bottom slopes (m = 1/25 and m = 1/50). The 2-parameter Weibull distribution was used to estimate Vmax* = Vmax/(gHm0T012) with coefficient of determination R2 = 83.3%. In this study, the bottom slope (m = 1/50 and m = 1/25) did not significantly influence Vmax or the number of overtopping events, Now. During the design phase of a mound breakwater, q is required to use the methods given in the literature to estimate Vmax. Thus, q must be estimated for design purposes when measured q is not available. In this study, CLASH Neural Network (CLASH NN) was used to estimate q with R2 = 63.6%. If the 2-parameter Weibull distribution proposed in this study is used to estimate Vmax with q estimated using CLASH NN, the prediction error of Vmax* is R2 = 61.7%. With the method presented in this study, the ratio between estimated and measured Vmax* falls within the range 1/2 to 2 (90% error band) when q is estimated with CLASH NN. The new estimators derived in this study provide good predictions of Now and Vmax with a method simpler than those in the literature on overtopped mound breakwaters in depth-limited breaking wave conditions on gentle sea bottoms (1/50 ≤ m ≤ 1/25).

中文翻译:

在破浪条件和平缓海底的土墩防波堤上的单个波浪超过体积

摘要 土墩防波堤通常被设计为限制平均波浪越顶率(q)或最大单个波浪越顶量(Vmax)。然而,很少有研究关注在深度有限的破浪条件下防波堤上的波浪越顶体积。本研究分析了在深度限制破碎波条件下(0.20 ≤ 0.33 ≤ Rc/Hm0 ≤ 2.83)和三层防护层(Cubipod®-1L、rock-2L 和 cube-2L)对土墩防波堤的二维物理测试Hm0/hs ≤ 0.90)和两个底部斜率(m = 1/25 和 m = 1/50)。2 参数威布尔分布用于估计 Vmax* = Vmax/(gHm0T012),决定系数 R2 = 83.3%。在这项研究中,底部坡度(m = 1/50 和 m = 1/25)没有显着影响 Vmax 或越过事件的数量,现在。在土墩防波堤的设计阶段,q 需要使用文献中给出的方法来估计 Vmax。因此,当测量的 q 不可用时,必须为设计目的估计 q。在本研究中,使用 CLASH 神经网络 (CLASH NN) 来估计 q,R2 = 63.6%。如果使用本研究中提出的2参数威布尔分布来估计Vmax,q估计使用CLASH NN,则Vmax*的预测误差为R2 = 61.7%。使用本研究中介绍的方法,当使用 CLASH NN 估计 q 时,估计和测量的 Vmax* 之间的比率落在 1/2 到 2 的范围内(90% 误差带)。
更新日期:2020-08-01
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