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{\bf Referee of the article\\
``Cliff collapse hazards spatio-temporal modelling through GIS : from parameters determination to multi-scale approach
''}\\
by Anne Duperret, Cyrille Bertelle and Pierre Laville\\
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The abstract deals with cliff collapses, using observations and in situ measures, along 120 km of the French chalk coastline in Upper-Normandy and Picardy.\\`
Also, it proposes a first computation of hazard modelling Based on the GIS model.
\\
The purpose is promizing and it is, up to me, a novel point of view.

I suggest to accept the contribution.

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