GEOSCAN, résultats de la recherche


TitreHow subsurface voxel modelling and uncertainty analysis contribute to habitat-change prediction and monitoring
TéléchargerTéléchargement (publication entière)
LicenceVeuillez noter que la Licence du gouvernement ouvert - Canada remplace toutes les licences antérieures.
AuteurVan Lancker, V; Kint, L; Montereale-Gavazzi, G; Terseleer, N; Chademenos, V; Missiaen, T; De Mol, R; De Tré, G; van Heteren, S; van Maanen, P P; Stafleu, J
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295, 2017 p. 116, (Accès ouvert)
LiensGeoHab 2017
ÉditeurRessources naturelles Canada
Réunion2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Commission géologique du Canada, Dossier public 8295
Sujetstechniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement; écosystèmes; établissement de modèles; géologie du substratum rocheux; lithostratigraphie; sédiments marins; milieu sédimentaire; aggrégats; bathymétrie; trous de mine; biologie; surveillance; prise de décision; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique; géologie économique
Illustrationsphotographs; 3-D models
ProgrammeGéoscience en mer, Géoscience de la gestion des océans
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
For long-term predictions of geological resource quantity and quality, a voxel model was built for the subsurface of the Belgian part of the North Sea (Belgian Science Policy 'TILES'). The 3D voxels contain lithostratigraphic information over the entire data volume (up to -70 m), but also sediment characteristics and a suite of sediment-dynamic parameters in the upper voxel (i.e., the seabed). Derivative data products include probability maps of sediment type and resource-suitability maps that reflect a combination of user-specific criteria.
From stakeholder consultation, it became clear that the model has numerous potential applications, provided that resolution requirements from very small-scale to large-scale can be met (e.g., assessing local aggregate quality, but also decision-making on long-term resource use). To accommodate these varying needs, and also to enhance computational speed, voxel models were post-processed to vary the size of the voxels dependent on user demand. As such, data density, but also geological heterogeneity can steer the voxel size.
Uncertainty is parameterised to generate data products with confidence limits. Uniquely, the quality of each of the data fields in the databases is quantified in order to be propagated in the voxel model. Additionally, interpolation-related uncertainty, as well as uncertainty in the mapping of the lithological class and stratigraphic uncertainty (i.e. the geological layer to which a so-called lithoclass belongs) is incorporated. Visualisation of these uncertainties is highly challenging, and is addressed through variation in the sizes of the voxels or through transparency.
An ample spectrum of benefits exists for habitat mapping. Firstly, the geology of the shallow subsurface is accounted for, being highly relevant in predicting and constraining habitat change in long-term projections of resource use. The approach is also pertinent to assist present-day seabed mapping. Uncertainty mapping is critical to judge on the accuracy of seabed maps, and it assists in interpreting habitat changes within an envelope of natural variability, imposed by both the geological nature of the seabed and the highly dynamic sedimentary environment.