Biblio: boulders
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@ -430,14 +430,53 @@ porosity induced friction.
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Displacement of blocks or boulders by waves has been a major topic in
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understanding the influence of storm and tsunami waves in coastal regions.
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Several approaches have been taken to study this phenomenon. In a first part,
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we will discuss in-situ studies on displaced boulders. In a second part, we
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will review models of block displacements.
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Several approaches have been taken to study this phenomenon.
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% In a first part, we will discuss in-situ studies on displaced boulders. In a
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% second part, we will review models of block displacements.
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\subsection{Models}
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The main goal of studying boulder displacement is generally to establish the
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cause of boulder deposits in coastal areas. \textcite{nott1997extremely} was
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among the first to propose hydrondynamic equations that aimed to calculate the
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wave height that would lead to the displacement of a boulder for storm and
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tsunami waves. The main difference between storm and tsunami waves in those
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equations was the flow velocity relative to wave height. The calculation of the
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minimum flow velocity for boulder transport is obtained by calculating an
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equilibrium between drag, lift and restraining forces.
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Those equations were refined by \textcite{nott2003waves} in order to account
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for the pre-transport environment of the boulder. \citeauthor{nott2003waves}
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derived equations for submerged, sub-aerial and joint bounder boulders. A new
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parameter ($\delta$) was introduced to differentiate between tsunami and storm
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waves. This study highlights the importance of the initial environment of a
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boulder for wave transport conditions. Compared to the equations from
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\textcite{nott1997extremely}, an aditionnal inertia term is added to the
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equilibrium equation for sub-aerial boulders, while the drag force is removed
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for joint-bounded blocks.
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\textcite{nandasena2011reassessment} noted that \citeauthor{nott2003waves}'s
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equations could be improved, and proposed a new set of equations correcting
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the lift and inertia terms in \citeauthor{nott2003waves}'s equations.
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\textcite{nandasena2011reassessment} found that the new equations produced up
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to a \SI{65}{\percent} difference with \citeauthor{nott2003waves}'s equations.
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\textcite{buckley2012inverse} proposed alternative equations for sliding and
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overturning of submerged boulders. An equation for block sliding was introduced
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by considering friction on the bed. \textcite{weiss2012mystery} investigated
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the influence of bed roughness on block displacement. A new stability criteria
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was established, and bed roughness was found to be a major factor in boulder
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displacement. In contrast with the findings from \textcite{nott2003waves}, the
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threshold wave amplitude for block displacement was found to be similar between
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tsunami and storm waves.
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\subsection{In-situ studies}
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\cite{barbano2010large}
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\cite{paris2011}
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\cite{barbano2010large}: boulders deposity in Sicily -> probably tsunamis
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\cite{paris2011}:
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\cite{nandasena2011numerical}
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\cite{may2015block}
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\cite{biolchi2016}
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