Wave run-up prediction for composite bucket foundation due to regular wave and current

Abstract

The prediction of wave run-up is a major issue when designing offshore structures, such as offshore wind turbine foundation. In this study M5ʹ model tree algorithm was used to predict the wave run-up for CBF due to regular wave and current. This study investigated wave-only and wave–current run-up on a CBF via model tests. The influences of the relative wave height, wave steepness, and Froude number on the relative run-up were investigated. Based on different combinations of non-dimensional parameters, the performance of novel formulae developed using the M5ʹ model tree (M5MT) algorithm was analysed in terms of statistical error indexes. The relative wave run-up was found to increase with the wave steepness, and under low water depth increase with the Froude number for low wave steepness. Based on the scatter parameter, relative water depth, the prediction formulae developed exhibited optimal performance when predicting run-up under wave-only conditions. New formulae with a reliable precision were developed for wave–current conditions based on the scatter parameter, wave steepness, relative wave height, and Froude number. The experimental results and proposed run-up formulae will assist engineers in the design of CBFs.