Citation

BibTex format

@article{Shadrick:2023:10.5194/esurf-11-429-2023,
author = {Shadrick, J and Rood, D and Hurst, M and Piggott, M and Wilcken, K and Seal, A},
doi = {10.5194/esurf-11-429-2023},
journal = {Earth Surface Dynamics},
pages = {429--450},
title = {Constraints on long-term cliff retreat and intertidal weathering at weak rock coasts using cosmogenic ¹Be, nearshore topography and numerical modelling},
url = {http://dx.doi.org/10.5194/esurf-11-429-2023},
volume = {11},
year = {2023}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The white chalk cliffs on the south coast of England are one of the most iconic coastlines in the world. Rock coasts located in a weak lithology, such as chalk, are likely to be most vulnerable to climate-change-triggered accelerations in cliff retreat rates. In order to make future forecasts of cliff retreat rates as a response to climate change, we need to look beyond individual erosion events to quantify the long-term trends in cliff retreat rates. Exposure dating of shore platforms using cosmogenic radionuclide analysis and numerical modelling allows us to study past cliff retreat rates across the Late Holocene for these chalk coastlines. Here, we conduct a multi-objective optimisation of a coastal evolution model to both high-precision topographic data and 10Be concentrations at four chalk rock coast sites to reveal a link between cliff retreat rates and the rate of sea-level rise. Furthermore, our results strengthen evidence for a recent acceleration in cliff retreat rates at the chalk cliffs on the south coast of England. Our optimised model results suggest that the relatively rapid historical cliff retreat rates observed at these sites spanning the last 150 years last occurred between 5300 and 6800 years ago when the rate of relative sea-level rise was a factor of 5–9 times more rapid than during the recent observable record. However, results for these chalk sites also indicate that current process-based models of rock coast development are overlooking key processes that were not previously identified at sandstone rock coast sites. Interpretation of results suggest that beaches, cliff debris and heterogenous lithology play an important but poorly understood role in the long-term evolution of these chalk rock coast sites. Despite these limitations, our results reveal significant differences in intertidal weathering rates between sandstone and chalk rock coast sites, which helps to inform the long-standing debate of “wave versus weathering” a
AU - Shadrick,J
AU - Rood,D
AU - Hurst,M
AU - Piggott,M
AU - Wilcken,K
AU - Seal,A
DO - 10.5194/esurf-11-429-2023
EP - 450
PY - 2023///
SN - 2196-6311
SP - 429
TI - Constraints on long-term cliff retreat and intertidal weathering at weak rock coasts using cosmogenic ¹Be, nearshore topography and numerical modelling
T2 - Earth Surface Dynamics
UR - http://dx.doi.org/10.5194/esurf-11-429-2023
UR - https://esurf.copernicus.org/articles/11/429/2023/esurf-11-429-2023.html
UR - http://hdl.handle.net/10044/1/103936
VL - 11
ER -