TY - JOUR
T1 - Wave runup and inundation dynamics on a perched beach
AU - Portch, Carly E.
AU - Cuttler, Michael V.W.
AU - Buckley, Mark L.
AU - Hansen, Jeff E.
AU - Lowe, Ryan J.
N1 - Funding Information:
This research was supported by Marine Energy Research Australia (MERA), jointly funded by The University of Western Australia and the Western Australian Government, via the Department of Primary Industries and Regional Development (DPIRD). We also acknowledge wave data sourced from MERA and Integrated Marine Observing System (IMOS) - IMOS is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). We also acknowledge the City of Albany for providing the permit to deploy our camera system in Torbay, Albany. The authors thank Carlin Bowyer, Matt Hatcher, Thobani Hlophe, and Rebecca Green for assisting with field data collection. We also thank John Stanley and Shawn Harrison for their assistance with the camera station setup. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Funding Information:
This research was supported by Marine Energy Research Australia (MERA), jointly funded by The University of Western Australia and the Western Australian Government , via the Department of Primary Industries and Regional Development (DPIRD). We also acknowledge wave data sourced from MERA and Integrated Marine Observing System (IMOS) - IMOS is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). We also acknowledge the City of Albany for providing the permit to deploy our camera system in Torbay, Albany. The authors thank Carlin Bowyer, Matt Hatcher, Thobani Hlophe, and Rebecca Green for assisting with field data collection. We also thank John Stanley and Shawn Harrison for their assistance with the camera station setup. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Publisher Copyright:
© 2023 The Authors
PY - 2023/8/15
Y1 - 2023/8/15
N2 - Sandy beaches perched over rocky shore platforms are common globally, yet their mixed sand and rocky morphology present challenges for quantifying and predicting wave runup and inundation. For typical linear beach profiles, simple relationships can be made between vertical runup and horizontal inundation based on beach slope. However, as topographic irregularities increase, substantial deviations from these relationships can occur. Shore platforms often experience a range of beach states, from full sand coverage (accreted) to complete shore platform erosion (exposed). As a result, existing methods for quantifying runup and inundation on purely sandy beaches are generally not directly applicable to these coastlines. To advance our understanding of runup and inundation on perched beaches, the aim of this work is three-fold: (1) to provide a method for quantifying beach slope and runup across a range of perched beach profiles, (2) to assess the relationship between vertical runup and horizontal inundation observations, and (3) to understand how different hydrodynamic mechanisms (i.e., setup, swash) contribute to runup during different beach states. To achieve this, we conducted an 8-month field study along a perched beach in southwestern Australia that experiences large seasonal variations in beach state and wave climate. A method was developed to measure runup and beach slope when only the topography shoreward of the shore platform edge was known. Using this method, an approximately linear relationship between inundation and runup was identified by incorporating beach slope. Our observations suggest that the components that dominate runup on perched beaches were primarily dependent on beach state (i.e., accreted versus exposed). Runup was dominated by swash in the infragravity band when in an accreted beach state, and setup when in an exposed beach state. These results aid our understanding of coastal processes on perched beaches, while providing new methods applicable to a range of perched beach profiles.
AB - Sandy beaches perched over rocky shore platforms are common globally, yet their mixed sand and rocky morphology present challenges for quantifying and predicting wave runup and inundation. For typical linear beach profiles, simple relationships can be made between vertical runup and horizontal inundation based on beach slope. However, as topographic irregularities increase, substantial deviations from these relationships can occur. Shore platforms often experience a range of beach states, from full sand coverage (accreted) to complete shore platform erosion (exposed). As a result, existing methods for quantifying runup and inundation on purely sandy beaches are generally not directly applicable to these coastlines. To advance our understanding of runup and inundation on perched beaches, the aim of this work is three-fold: (1) to provide a method for quantifying beach slope and runup across a range of perched beach profiles, (2) to assess the relationship between vertical runup and horizontal inundation observations, and (3) to understand how different hydrodynamic mechanisms (i.e., setup, swash) contribute to runup during different beach states. To achieve this, we conducted an 8-month field study along a perched beach in southwestern Australia that experiences large seasonal variations in beach state and wave climate. A method was developed to measure runup and beach slope when only the topography shoreward of the shore platform edge was known. Using this method, an approximately linear relationship between inundation and runup was identified by incorporating beach slope. Our observations suggest that the components that dominate runup on perched beaches were primarily dependent on beach state (i.e., accreted versus exposed). Runup was dominated by swash in the infragravity band when in an accreted beach state, and setup when in an exposed beach state. These results aid our understanding of coastal processes on perched beaches, while providing new methods applicable to a range of perched beach profiles.
KW - Inundation
KW - Perched beach
KW - Shore platform
KW - Wave runup
UR - http://www.scopus.com/inward/record.url?scp=85161032345&partnerID=8YFLogxK
U2 - 10.1016/j.geomorph.2023.108751
DO - 10.1016/j.geomorph.2023.108751
M3 - Article
AN - SCOPUS:85161032345
SN - 0169-555X
VL - 435
JO - Geomorphology
JF - Geomorphology
M1 - 108751
ER -