The present study analyzes the field measurements of the reflective response of a permeable rubble mound breakwater encountered with a bimodal wave regime. The coexistence of sea and swell wind-driven waves during the measurement program provided directional spreading wave realizations for subsequent bulk and frequency-dependent wave reflection analysis. The directional wave data were acquired near the primary breakwater of Chabahar Port within 28 days, including 643 bursts using an AWAC wave recorder. The available formulae for wave reflection coefficient were evaluated against this data set. Results showed that the equations proposed by Postma (1989) and Zanuttigh and Van der Meer (2007) are in general agreement with the observations of the present study. However, the accuracy of reflection coefficient predictions was improved by developing two new alternative formulations. It was realized that the frequency reflective response differs between sea and swell prevailing conditions. The reflection coefficient decreases drastically within high sea wave predominant periods for the harmonics higher than peak frequency. However, reflection coefficients of high harmonics reduced slightly within swell domination periods. The frequency-dependent reflection coefficients can be even higher than unity due to energy transfer amongst other wave harmonics.

本研究分析了遇到双峰波状态的可渗透碎石堆防波堤的反射响应的现场测量。测量程序期间海浪和涌浪驱动波的共存为随后的体波反射和频率相关波反射分析提供了定向传播波的实现。定向波数据是在 28 天内在恰巴哈尔港的主要防波堤附近获得的，包括使用 AWAC 记录仪的 643 次爆发。针对该数据集评估了波反射系数的可用公式。结果表明，Postma (1989) 和 Zanuttigh 和 Van der Meer (2007) 提出的方程与本研究的观察结果基本一致。然而，通过开发两种新的替代公式，提高了反射系数预测的准确性。认识到频率反射响应在海浪和涌浪主导条件之间不同。对于高于峰值频率的谐波，反射系数在高海浪占主导地位的时期内急剧下降。然而，高次谐波的反射系数在涌浪支配期间略有下降。由于其他波谐波之间的能量转移，频率相关反射系数甚至可以高于 1。然而，高次谐波的反射系数在涌浪支配期间略有下降。由于其他波谐波之间的能量转移，频率相关反射系数甚至可以高于 1。然而，高次谐波的反射系数在涌浪支配期间略有下降。由于其他波谐波之间的能量转移，频率相关反射系数甚至可以高于 1。