Late Holocene Cliff Retreat in Del Mar, CA, Revealed From Shore Platform 10Be Concentrations and Numerical Modeling

Clow, T.; Willenbring, J. K.; Young, A. P.; Matsumoto, H.; Hidy, A. J.; Shadrick, J. R.

doi:10.1029/2022jf006855

Title: Late Holocene Cliff Retreat in Del Mar, CA, Revealed From Shore Platform ¹⁰Be Concentrations and Numerical Modeling

Journal Article · Mon Apr 17 00:00:00 EDT 2023 · Journal of Geophysical Research. Earth Surface

DOI:https://doi.org/10.1029/2022jf006855· OSTI ID:1971584

^[1];

^[2];

^[2]; Hidy, A. J. ^[3]; Shadrick, J. R. ^[4]

Stanford University, CA (United States)
University of California, San Diego, CA (United States). Scripps Institute of Oceanography
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Earth Science and Engineering Imperial College London London UK

Rocky coast cliff retreat presents a hazard to coastal communities and infrastructure that is potentially amplified under rising sea level conditions, among other factors. Unfortunately, constraints on retreat rates are typically limited to those derived from imagery and maps spanning the last ~100 years. Here, we use a newly developed coupled model of shore platform profile evolution and cosmogenic radionuclide production that considers the influence of relative sea level (RSL) rise, weathering, material resistance, and wave height decay to model cliff retreat over millennial timescales and its potential drivers in Del Mar, California. We demonstrate the ability to use topographic and bathymetric measurements from a narrow shore platform along with a limited data set of nine cosmogenic 10Be concentrations extending ~125 m from the cliff base to obtain modeled cliff retreat rates that steadily range from 5.0 to 12.5 cm yr^-1 over the last two millennia until 100 years before present. These rates are consistent with modern retreat rates of about 2–19 cm yr^-1 here. RSL rise in Southern California remained relatively constant during the late Holocene, potentially explaining the relatively stable modeled cliff retreat rate over this time. We also explore the relative influence of weathering, material resistance, and wave erosion efficacy and find that both weathering and wave-driven erosion are necessary to replicate the measured data at this location, with the latter exerting a stronger control on model acceptance, suggesting that waves may provide a possible mechanism by which RSL rise may influence coastal cliff erosion in southern California.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Army Corps of Engineers; California Department of Parks and Recreation

Grant/Contract Number:: AC52-07NA27344; C1670004; C19E0049; W912HZ1920020

OSTI ID:: 1971584

Report Number(s):: LLNL-JRNL-834640; 1053146

Journal Information:: Journal of Geophysical Research. Earth Surface, Vol. 128, Issue 4; ISSN 2169-9003

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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