Search results for "BGL"
showing 10 items of 30 documents
Two-dimensional apparent microfabric of the basal Late Weichselian till and associated shear zone: case study from western Latvia
2008
The examination of glacial sediments in thin sections has become a common procedure in recent years. Apparent sand grain orientation (microfabric) in thin sections is one of the key elements marking certain microstructures. In an attempt to make till micromorphology studies less subjective and investigate the orientation of sand-sized particles in tills, we have developed an image analysis procedure to measure and analyse the spatial distribution of the till microfabric. We studied 13 thin sections of the Weichselian subglacial till and basal shear zone outcropping in the Baltic Sea bluffs at the Ziemupe site in western Latvia. The results were visualized as a two-dimensional grid of rose d…
Structures de déformation induites par surpressions de fluide dans les environnements sous-glaciaires et marin profonds : implications paléoenvironne…
2014
Soft-sediment deformation structures (SSDs) occur in unconsolidated sediments, during or shortly after deposition. SSDs are abundant in subglacial and deep-marine environments because of the development of fluid overpressure. Case studies of these two sedimentary environments were used (1) to reconstruct palaeoenvironments from SSDS, and (2) to define the impacts of SSDS on glacial morphologies and (3) petrophysical properties.(1) Analyses of strain regimes, deformation mechanisms, and chronologies in SSDs served to improve palaeoenvironmental reconstructions. These structures were used as proxys to estimate variations of ice flow velocities, ice thickness, meltwater production, and positio…
3D DATA INTEGRATION FOR WEB BASED OPEN SOURCE WebGL INTERACTIVE VISUALISATION
2022
Abstract. Recent advances in open-source geospatial technologies in WebGIS allowed the visualization of a 3D complex environment on the web, exploiting realistic Globe reproduction of the real territorial asset. At the same time, in the field of gaming technologies, the new possibilities offered by open-source WebGL JavaScript libraries allowed the creation of Virtual Reality navigation models on the web. The integration between 3D GIS globe navigation models and VR environment navigation is a solution that offers a further level of detail in web navigation, exploiting the capabilities of web browsers in the best way. This research further contributes to this field, showing a workflow to in…
Le Second Voyage de Rudolf Kassner (1873-1959) : Souvenirs de voyages et écriture de soi
2010
Introduction : Kassner et l’écriture de soi Souvent encore, le nom de Rudolf Kassner est évoqué par la critique indirectement, notamment à l’occasion de travaux concernant d’autres écrivains qui lui étaient contemporains et qui, comme Rainer Maria Rilke ou Hugo von Hofmannsthal, sont désormais entrés définitivement dans le panthéon de la littérature européenne. Il suffit de mentionner, à propos du premier, l’ouvrage de Gerhart Mayer, Rilke und Kassner – Eine geistige Begegnung, et, à ...
Porewater pressure control on subglacial soft sediment remobilization and tunnel valley formation: A case study from the Alnif tunnel valley (Morocco)
2014
25 pages; International audience; In the eastern part of the Moroccan Anti-Atlas Mountains, the Alnif area exposes a buried Ordovician glacial tunnel valley (5 km wide, 180 m deep) cut into preglacial marine sediments. The preglacial sedimentary sequence, deposited in a marine environment, is characterized by a typical "layer-cake" configuration of permeable (sand) and impermeable (clays and early-cemented sandstones) layers. At the base of the tunnel valley, a discontinuous and fan-shaped glacial conglomeratic unit 10 to 15 m thick occurs, erosively deposited over preglacial marine sediments. The conglomeratic unit is composed of preglacial intraclasts embedded within a sandy matrix. Both …
Development of a Virtual CH Path on WEB: Integration of a GIS, VR, and Other Multimedia Data
2021
Recent advances in computer science allowed people to explore new possibilities for the fruition of CH all around the world. The development of Geographic Information Systems (GIS) in the field of territorial systems and the evolution of Virtual Reality (VR) solutions opened new scenarios for the valorization of cultural goods. At the same time, recent advances in digital photogrammetry and 3D interactive navigation models on WEB-based on WebGL technologies offered new opportunities of digital fruition of CH. Considering this panorama, the presented work shows how the integration of these technologies gives a precious added value to the virtual fruition of CH. In particular, it has been con…
Definition of a Workflow for Web Browsing of 3D Models in Archaeology
2016
The Cultural Heritage (CH) is a fundamental element of promotion of territories and of tourism development. Publishing 3D models of archaeological sites and their three-dimensional reconstruction on the Web is one of the best ways to spread their knowledge. However, many recent scientific researches in this field have highlighted the limitations and difficulties related to the networking of interactive 3D models. The main difficulties are related to the complexity and the size of models, which influence the access speed, and the cost of software and hardware needed for the publication on the WEB. In light of this background, this article describes the further advances of research activities…
Typology of Hirnantian glacial pavements in SW Djado Basin (NE Niger).
2006
11 pages; International audience
Talsu un Vilkmuižas ezeru nogulumu uzkrāšanās apstākļu izmaiņu raksturs holocēnā
2019
Mainoties klimatam holocēnā, mainās mainās arī nogulumu uzkrāšanās apstākļi, kas ietekmē nogulumu īpašības. Savukārt nogulumos uzkrājušās augu makroatliekas ļauj spriest par veģetācijas rakstura un ezera līmeņa izmaiņām to attīstības gaitā. Maģistra darba mērķis bija noskaidrot kā mainījies nogulumu uzkrāšanās raksturs Vilkmuižas un Talsu ezeru attīstības laikā holocēnā, analizējot šo ezeru nogulumus ar karsēšanas zudumu un augu makroatlieku sastāva noteikšanas metodi. Pētījumā konstatēts, ka abu ezeru holocēna laikā uzkrājušos nogulumu sastāvā ir liels karbonātu īpatsvars, kas pakāpeniski samazinās griezuma augšdaļā, kā arī tajos salīzinājumā ar citiem ezeriem ir ļoti maza ūdensaugu sugu a…