Analyzing the performance of the calculation method for wave reflection coefficients

Abstract

The accuracy of a wave reflection coefficient in a wave field is affected to varying degrees by the interference of noise and nonlinearity. To accurately calculate this reflection coefficient in complex sea states, the accuracy and stability of each algorithm must be systematically studied. First, a noise term and nonlinear components are added to simple harmonic waves to synthesize regular and irregular waves that conform to the actual situation. Second, the wave states of different preset reflectance are calculated, and their performance parameters are compared using various algorithms. Finally, these methods are further applied for calculating the reflection coefficient of a physical wave flume, and the performance of the algorithms is reverified. The calculation results under optimal spacing show that for regular waves, the Mansard three-point method, Goda two-point method, and transfer function method outperform other algorithms. For irregular waves, the calculation frequency range of the Goda two-point method is limited, the error of separate reflected waves of the transfer function method is large, and the performance of the Mansard three-point method is the best. The conclusions of this study can provide a theoretical reference for calculating the reflection coefficient under different wave conditions, which have certain practical importance in model tests and engineering applications.