Cliff retreat and sea bed morphology under monochromatic wave forcing: Experimental study

Caplain, Bastien; Astruc, Dominique; Regard, Vincent; Moulin, F.

doi:10.1016/j.crte.2011.06.003

Cited by 15 publications

(15 citation statements)

References 16 publications

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“…Therefore, higher scarps should retreat more slowly, as observed in analogue experiments by Damgaard & Dong (2004) or Caplain et al (2011). In the coastal segment located north of Tal-Tal…”

Section: Different Coastal Morphology North and South 2675°s: Role Omentioning

confidence: 84%

Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

et al. 2016

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“…Therefore, higher scarps should retreat more slowly, as observed in analogue experiments by Damgaard & Dong (2004) or Caplain et al (2011). In the coastal segment located north of Tal-Tal…”

Section: Different Coastal Morphology North and South 2675°s: Role Omentioning

confidence: 84%

Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

et al. 2016

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“…Rather than referring to difficult to use tidal records from tide gages, tidal modeling was performed with FES 2012 software (Carrère et al, 2012). This model gives all the constituents of the harmonic tide analysis.…”

Section: Tidesmentioning

confidence: 99%

GlobR2C2 (Global Recession Rates of Coastal Cliffs): a global relational database to investigate coastal rocky cliff erosion rate variations

Prémaillon¹,

Regard

Dewez

et al. 2018

Earth Surf. Dynam.

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Abstract. Rocky coast erosion (i.e., cliff retreat) is caused by a complex interaction of various forcings that can be marine, subaerial or due to rock mass properties. From Sunamura's seminal work in 1992, it is known that cliff retreat rates are highly variable over at least four orders of magnitude, from 1 to 10 mm yr−1. While numerous local studies exist and explain erosion processes at specific sites, there is a lack of knowledge at the global scale. In order to quantify and rank the various parameters influencing erosion rates, we compiled existing local studies into a global database called GlobR2C2 (which stands for Global Recession Rates of Coastal Cliffs). This database reports erosion rates from publications, cliff setting and measurement specifications; it is compiled from peer-reviewed articles and national databases. In order to be homogeneous, marine and climatic forcings were recorded from global models and reanalyses. Currently, GlobR2C2 contains 58 publications that represent 1530 studied cliffs and more than 1680 estimated erosion rate. A statistical analysis was conducted on this database to explore the links between erosion rates and forcings at a global scale. Rock resistance, inferred using the criterion of Hoek and Brown (1997), is the strongest signal explaining variation in erosion rate. Median erosion rates are 2.9 cm yr−1 for hard rocks, 10 cm yr−1 for medium rocks and 23 cm yr−1 for weak rocks. Concerning climate, only the number of frost days (number of day per year below 0 ∘C) for weak rocks shows a significant, positive, trend with erosion rate. The other climatic and marine forcings do not show any clear or significant relationship with cliff retreat rate. In this first version, GlobR2C2, with its current encompassing vision, has broad implications. Critical knowledge gaps have come to light and prompt a new coastal rocky shore research agenda. Further study of these questions is paramount if we one day hope to answer questions such as what the coastal rocky shore response to sea-level rise or increased storminess may be.

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“…Critically, their morphology and rate of erosion reflect important variations through time and space. Those variations are explained by local site conditions that dictate the interaction between rock strength (Dornbusch et al, 2008;Sunamura, 1992), rock structure (Cruslock et al, 2010), and climatic and marine-driven processes (Anderson et al, 1999;Caplain et al, 2011;Earlie, 2015;Stephenson & Kirk, 2000;Trenhaile, 2000;Young et al, 2021). Rock properties and environmental conditions in the coastal environments ultimately control erosion rates, define the type of mass movement experiences (Sunamura, 1992) and control the spatial pattern of erosion across the cliff face (Rosser et al, 2007(Rosser et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Conceptual model of fracture‐limited sea cliff erosion: Erosion of the seaward tilted flyschs of Socoa, Basque Country, France

Prémaillon

Dewez

Regard

et al. 2021

Earth Surf Processes Landf

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Sea cliff morphology and erosion rates are modulated by several factors, including rock control that reflects both lithology and rock structure. Erosion is anticipated to preferentially exploit 'fractures', broadly meant as any discontinuity in an otherwise continuous medium, where the rock mass is weakest. Unpicking the direct control of such fractures on the spatial and temporal pattern of erosion remains, however, challenging. To analyse how such fractures control erosion, we monitored the evolution of a 400 m-long stretch of highly structured sedimentary cliffs in Socoa, Basque Country, France. The rock is known as the Socoa flysch formation. This formation combines decimetre-thick turbidites composed of repeat triplets of medium to strong calcareous sandstone, laminated siltstones and argillaceous marls. The sequence plunges at 45 into the sea with a shore-parallel strike. The cliffs are cross-cut by two normal and reverse fault families, with 10-100 m alongshore spacing, with primary and secondary strata-bound fractures perpendicular to the bedding, which combined delimit the cliff rock mass into discrete blocks that are exploited by the erosion process. Erosion, and sometimes plucking, of such beds and blocks on the cliff face was monitored using ground-based structure-from-motion (SfM) photogrammetry, over the course of 5.7 years between 2011 and 2017. To compare with longer time change, cliff-top retreat rate was assessed using SfM-orthorectified archive aerial photographs spanning 1954-2008. We show that the 13,250 m 2 cliff face released 4500 blocks exceeding 1.45 Â 10 À3 m 3 , removing a total volume of 170 m 3 . This equates to an average cliff erosion rate of 3.4 mm/year, which is slightly

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Cliff retreat and sea bed morphology under monochromatic wave forcing: Experimental study

Cited by 15 publications

References 16 publications

Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

GlobR2C2 (Global Recession Rates of Coastal Cliffs): a global relational database to investigate coastal rocky cliff erosion rate variations

Conceptual model of fracture‐limited sea cliff erosion: Erosion of the seaward tilted flyschs of Socoa, Basque Country, France

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