NASBLA Public Library

This technical paper explains the hydrodynamic principles that govern how recreational boats generate waves and how wake characteristics change with boat speed, hull displacement, ballast, and wake-shaping devices. It introduces the concepts of displacement, semi-displacement, and planing regimes using the volumetric Froude number and describes how each operating regime influences wave height, wavelength, wave period, and energy. The document provides a scientific framework for comparing the wakes produced by different types of recreational vessels operating under varying conditions.

The paper also examines the effects of ballast and wake-shaping devices on wake formation, discusses wave stability and breaking thresholds, and explains the relationship between water depth, wavelength, and wave energy propagation. Drawing on published research and hydrodynamic theory, it presents technical analyses intended to support discussions of shoreline impacts, sediment transport, and recreational boating management. The document is intended for researchers, waterway managers, policymakers, and others interested in the science of recreational boat wakes and their potential implications for waterway management decisions.