Keywords
waves, shoreline erosion, coastal engineering, shear stress, sediment transport, recreational boating, shoreline management, coastal sustainability
Subjects
engineering, hydraulics, geomorphology, sediment transport, shoreline management, coastal sustainability
Abstract
Wave energy from recreational boat wakes is associated with erosion and degradation of shoreline ecotones. However, wake effects are often assumed to be negligible when boating lanes are located far from shore. In this study, field experiments were conducted to characterize hydrodynamics of recreational boat wakes at the shoreline of a shallow estuary as offshore sailing-line distance varied from 50 to 200m. Results indicate that wake events were considerably more energetic than ambient conditions, with an average 20% increase in wave height, 190% increase in near-bed orbital velocity, and 110% increase in wave-induced shear stress. Wake events generated farther from shore had longer wave periods, which increased instantaneous orbital velocities and wave-induced bed stresses. Integration of wake-induced shear stresses with shoreline sediment distributions indicated that wakes were competent to move shoreline sediments up to the D60 (1-3 mm), while currents and wind waves were incapable of moving sediments larger than the D20 (~0.2 mm). Importantly, shear stress analysis suggested that wakes generated 100-200m from shore may have similar or even increased potential for sediment entrainment at the shoreline as compared to wakes generated closer to shore. This finding has important implications for the management and mitigation of wake-related shoreline erosion.
Contributors
Gabriela Ford, Iris Peterson, Dr. David Cannon and Dr. Kelly Kibler
Date Created
Spring 4-19-2022
Semester
Spring
Type
Other
Language
English
Rights
This work is licensed under a Creative Commons Attribution 4.0 International License.
College
College of Engineering & Computer Science
Unit
CECE
Department
CECE
Recommended Citation
Kibler, Kelly M., "Hydrodynamic signatures of recreational boat wakes and their influence to sediment entrainment along the shoreline of a shallow estuary" (2022). Predicting Boat Wake Bank Erosion Risk. 1.
https://stars.library.ucf.edu/boatwakerisk/1
Included in
Civil Engineering Commons, Environmental Engineering Commons, Hydraulic Engineering Commons
Description
Data and meta data published in G.; Peterson, I.; Cannon, D.; Kibler, K. Hydrodynamic signatures of recreational boat wakes and their influence to sediment entrainment along the shoreline of a shallow estuary. Sustainability 2022, 14.