Modern depositional environment are mainly investigated in terms of internal sedimentary structures and associated grain-size characteristics. The latter are an intrinsic feature of sediments and hence essential for quantitative descriptions. It is therefore useful to have a tool available which allows direct and rapid calculation of numerous statistical parameters for a large number of samples. The G2Sd package gives full descriptive statistics and a physical description of sediments based on grain-size distributions derived from sieve analyses using a decadic log-transformation of the millimeter scale. Statistics are calculated either by using arithmetic and geometric methods of moments, or the graphic procedure of R.L. Folk and W.C. Ward (1957) to calculate mean grain-size, standard-deviation, skewness, and kurtosis based on the binary log-transformation of the mm scale. Numerical results are thus provided both in metric and phi units. The mode can be determined graphically by the user. Several percentiles and two common indices are calculated: D10, D50, D90, D90/D10, D90-D10, D75/D25, D75-D25, Trask Index (So) and Krumbein Index (Qd). A physical description of texture, sorting, skewness and kurtosis parameters is provided, based on the sediment nomenclature described in R.L. Folk (1966). The weight percentage of particles falling into each predefined size fraction is also included in the results. This package runs within the CRAN R-project.

%B Géomorphologie: relief, processus, environnement %P 73-78 %8 06/2014 %G eng %N 1 %0 Journal Article %J Coastal Engineering %D 2012 %T Comment on 'Reconstructing tsunami run-up from the characteristics of tsunami deposits on the Thai Andaman Coast' by Srisutam and Wagner (2010) %A Raphael Paris %A Nandasena, N A K %A Jérôme Fournier %X In this short comment, we address several approximations and assumptions in a model of tsunami reconstruction from the characteristics of tsunami deposits, presented by Soulsby et al. (2007) in a conference, and adapted by Srisutam and Wagner (2010) to the 2004 tsunami deposits in Thailand. (C) 2011 Elsevier B.V. All rights reserved. %B Coastal Engineering %C Paris, R (reprint author), CNRS, UMR 6524, F-63038 Clermont Ferrand, France CNRS, UMR 6524, F-63038 Clermont Ferrand, France Univ Clermont Ferrand, Clermont Univ, F-63000 Clermont Ferrand, France Saitama Univ, Grad Sch Sci & Engn, Sakura Ku, Saitama 33885 %V 61 %P 53–55 %G eng %R 10.1016/j.coastaleng.2011.11.009 %0 Journal Article %J Marine Geology %D 2010 %T Boulder and fine sediment transport and deposition by the 2004 tsunami in Lhok Nga (western Banda Aceh, Sumatra, Indonesia): A coupled offshore-onshore model %A Raphael Paris %A Jérôme Fournier %A Poizot, Emmanuel %A Etienne, Samuel %A Morin, Julie %A Lavigne, Franck %A Wassmer, Patrick %B Marine Geology %V 268 %P 43–54 %G eng %U http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord&UT=WOS:000274610100004 %R 10.1016/j.margeo.2009.10.011 %0 Journal Article %J Geomorphologie-Relief Processus Environnement %D 2010 %T Nannoliths abundance and distribution in tsunami deposits: example from the December 26, 2004 tsunami in Lhok Nga (northwest Sumatra, Indonesia) %A Raphael Paris %A Cachao, Mario %A Jérôme Fournier %A Voldoire, Olivier %B Geomorphologie-Relief Processus Environnement %P 109–118 %G eng %U http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord&UT=WOS:000276837200007