Version 1
: Received: 8 March 2024 / Approved: 8 March 2024 / Online: 10 March 2024 (17:00:58 CET)
How to cite:
Rink, G.M.; Farrell, E.J.; Bromley, G.R. Measuring Cliff Top and Cliff Face Retreat Rates of a Coastal Drumlin Using Structure-from-Motion in Galway Bay, Ireland.. Preprints2024, 2024030548. https://doi.org/10.20944/preprints202403.0548.v1
Rink, G.M.; Farrell, E.J.; Bromley, G.R. Measuring Cliff Top and Cliff Face Retreat Rates of a Coastal Drumlin Using Structure-from-Motion in Galway Bay, Ireland.. Preprints 2024, 2024030548. https://doi.org/10.20944/preprints202403.0548.v1
Rink, G.M.; Farrell, E.J.; Bromley, G.R. Measuring Cliff Top and Cliff Face Retreat Rates of a Coastal Drumlin Using Structure-from-Motion in Galway Bay, Ireland.. Preprints2024, 2024030548. https://doi.org/10.20944/preprints202403.0548.v1
APA Style
Rink, G.M., Farrell, E.J., & Bromley, G.R. (2024). Measuring Cliff Top and Cliff Face Retreat Rates of a Coastal Drumlin Using Structure-from-Motion in Galway Bay, Ireland.. Preprints. https://doi.org/10.20944/preprints202403.0548.v1
Chicago/Turabian Style
Rink, G.M., Eugene J. Farrell and Gordon R.M. Bromley. 2024 "Measuring Cliff Top and Cliff Face Retreat Rates of a Coastal Drumlin Using Structure-from-Motion in Galway Bay, Ireland." Preprints. https://doi.org/10.20944/preprints202403.0548.v1
Abstract
The rapid retreat of coastal cliffs poses a profound risk to property, transport infrastructure and public safety both in Ireland and globally. This study combines historical data (maps and orthophotos, 1842 to 2000) with contemporary UAV surveys (2019 to 2023) to quantify cliff top and cliff face retreat along a 250 m wide coastal drumlin at Silverstrand in Galway Bay, Ireland. Retreat rates for the cliff top and cliff face were calculated using 2D mapping and 3D modelling, respectively. Critically, the choice of method appears to have a major impact on apparent rates of cliff top retreat, with output from the 2D mapping approach (0.14 +/- 0.02 m yr-1) being double that of the 3D modelling approach (0.08 +/- 0.02 m year-1). The aperiodic development of a talus cone, which offers temporary protection to the cliff from storm waves, also influences the estimation of cliff retreat. The repeat cycles of talus slope formation and removal in this high wave energy climate suggest that the drumlin transitions between a periodically transport-limited system and supply limited system over short- and long-time periods, respectively, on the continuum of cliff types. These results warrant further research to identify and quantify the rates, patterns, drivers (marine and subaerial processes), and timing of cliff retreat rates in response to climate change.
Keywords
Soft rock cliff erosion; coastal erosion; structure-from-motion; shoreline detection
Subject
Environmental and Earth Sciences, Geography
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
