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Title3D probabilistic modelling and uncertainty analysis of glacial and post-glacial deposits of the city of Saguenay, Canada
 
AuthorSalsabili, M; Saeidi, A; Rouleau, A; Nastev, MORCID logo
SourceGeosciences vol. 11, issue 5, 204, 2021 p. 1-21, https://doi.org/10.3390/geosciences11050204 Open Access logo Open Access
Image
Year2021
Alt SeriesNatural Resources Canada, Contribution Series 20210150
PublisherMDPI AG
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceQuebec
AreaSaguenay; Canada
Lat/Long WENS -71.3606 -70.6239 48.5239 48.2247
SubjectsScience and Technology; Modelling
Illustrationsdiagrams; location maps; graphs; tables
ProgramPublic Safety Geoscience Rapid Risk Assessment
Released2021 05 07
AbstractKnowledge of the stratigraphic architecture and geotechnical properties of surficial soil sediments is essential for geotechnical risk assessment. In the Saguenay study area, the Quaternary deposits consist of a basal till layer and heterogeneous post-glacial deposits. Considering the stratigraphic setting and soil type heterogeneity, a multistep stochastic methodology is developed for 3D geological modelling and quantification of the associated uncertainties. This methodology is adopted for regional studies and involves geostatistical interpolation and simulation methods. Empirical Bayesian kriging (EBK) is applied to generate the bedrock topography map and determine the thickness of the till sediments and their uncertainties. The locally varying mean and variance of the EBK method enable accounting for data complexity and moderate nonstationarity. Sequential indicator simulation is then performed to determine the occurrence probability of the discontinuous post-glacial sediments (clay, sand and gravel) on top of the basal till layer. The individual thickness maps of the discontinuous soil layers and uncertainties are generated in a probabilistic manner. The proposed stochastic framework is suitable for heterogeneous soil deposits characterised with complex surface and subsurface datasets.
Summary(Plain Language Summary, not published)
Knowledge of the stratigraphy and geotechnical properties of surficial soil sediments is essential for geotechnical risk assessment. In the Saguenay study area, the Quaternary deposits consist of a basal till layer and heterogeneous post-glacial deposits. Considering the stratigraphic setting and soil type heterogeneity, a multistep methodology is developed for 3D geological modelling and quantification of the associated uncertainties. The method involves geostatistical interpolation and simulation. Empirical Bayesian kriging is applied to generate the bedrock topography map and determine the thickness of the till sediments. Sequential indicator simulation is then performed to determine the occurrence of the discontinuous post-glacial sediments (clay, sand and gravel) on top of the basal till layer. The individual thickness maps of the discontinuous soil layers and uncertainties are generated in a probabilistic manner.
GEOSCAN ID328567

 
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