60f Gratacós Torrà, Òscar [WorldCat Identities]
WorldCat Identities

Gratacós Torrà, Òscar

Works: 4 works in 6 publications in 3 languages and 7 library holdings
Roles: Other, Author
Publication Timeline
Most widely held works by Òscar Gratacós Torrà
Combining Discrete Element and Process-based sedimentary models: a new tool to model syntectonic sedimentation by Ana Carmona Bardella( Book )

2 editions published between 2016 and 2017 in English and held by 2 WorldCat member libraries worldwide

"In order to understand the current state of the natural rocky environment and its heterogeneity, we require to study the interaction and time evolution of the numerous geological processes that have contributed to the geological reality we observe today. Given this, the thesis presented here concerns itself with numerical modelling of geological processes. The forward numerical model developed during this thesis is able to simulate deformation and sedimentation in one single setting. To do this, the model uses a novel approach that combines a Discrete Element Model (DEM) and a process- based sedimentary model, Simsafadim (SFM) to link both processes, deformation and sedimentation. The discrete element model (DEM) deals with the simulation of deformation in different materials in 2D and 3D. It is primarily used to investigate the propagation and evolution of deformation in the upper crust caused by tectonic movements. Simsafadim (SFM) is a process-based numerical forward model, which simulates subaqueous clastic transport and sedimentation in three dimensions, including processes of carbonate interaction, production, transport and sedimentation. It can model efficiently the distribution of facies and the depositional architectures in a sedimentary basin and it is a powerful tool for the 3D prediction of stratigraphic structures. Merging both codes provides a new tool for geological modelling in which deformation is influenced by the presence of syntectonic sediment dispersal and deposition. In addition, the tectonic processes change the topographic surface, which influences fluid flow, transport and, consequently, sedimentation in the process-based sedimentary model. The interaction of tectonic and sedimentary processes allows us to study the propagation of deformation in the syntectonic materials as well as how these new sediments influence the propagation of deformation in the pretectonic unit. The model is applied in two different cases studies, in order to test the viability of the new model, as well as to achieve new insight in the respective themes treated: 1) First case study: the effect of normal faulting and a relay ramp on sediment dispersal. The model is used to study the sedimentary infill in an extensional basin, specifically related to a relay ramp system. To perform the test study two configurations are designed: with one normal fault, and with two overlapping normal faults linked by a relay ramp. The different results show that the source area location in relation to the available accommodation space plays the major role in the distribution of different sediment types into the basin. Nonetheless, when the source area for water and sediment is defined as regional and parallel to the fault, the grain size distribution obtained by the two overlapping faults linked by a relay ramp have clear asymmetries when compared with the ones obtained by one-fault configurations. Therefore, the different extensional experiments allow us to conclude that the configuration with a relay ramp can play an important role in the distribution of the sediments into the basin. 2) Second case study: The effect of syntectonic sedimentation on fold geometry The numerical is used to investigate the effect of syntectonic sedimentation on fold geometry and specifically related to a delta progradation surrounded by two growing anticlines. To the initial tectonic configuration that reproduces the growth of two faults, two different cases of the sedimentary model are considered: without sediments, and considering syntectonic sedimentation. Summing up, the main results obtained for these experiments conclude that the syntectonic sedimentation is controlling the mechanism of fold growth and the final fold geometry: the left-side fold shows a left-vergent asymmetric anticline. Moreover, the strain suggests that this anticline is passing from a detachment fold (without sediments) to a fault propagation fold basinwards (with sediments). As a consequence, the inner syncline and the related sedimentary basin are also changing in transversal and longitudinal direction, being wider with syntectonic sedimentation". -- TDX
Forward numerical modelling of carbonate basins: an ecological approach by Roger Clavera-Gispert( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

SIMSAFADIM-CLASTIC : Modelización 3D de transporte y sedimentación clástica subacuática by Òscar Gratacós Torrà( )

2 editions published between 2004 and 2019 in Spanish and Catalan and held by 2 WorldCat member libraries worldwide

"La modelización numérica ha sido una herramienta importante para complementar estudios geológicos en los que ha sido difícil la comprensión de la realidad debido a su tridimensionalidad y al hecho de tener únicamente una visión limitada bidimensional o casi-tridimensional de la misma.Centrado en el estudio y análisis del relleno de cuencas sedimentarias, la modelización numérica puede proporcionar información sobre la distribución espacial y temporal de los cuerpos sedimentarios, así como de la compleja heterogeneidad geológica presente.En este ámbito, la tesis presentada se ha centrado en la elaboración de un programa informático (denominado SIMSAFADIM-CLASTIC) que simula, en las tres dimensiones del espacio, los procesos de transporte y sedimentación de tres tipos diferentes de sedimentos elásticos terrígenos y que incorpora la interacción con organismos productores de carbonato.En este sentido, el programa informático desarrollado es pionero en esta línea de investigación, ya que la mayoría de los programas de modelización existentes en la actualidad se centran en la modelización de uno u otro tipo de sedimentos o en una modelización únicamente bidimensional o utilizando leyes empíricas para simular el transporte y sedimentación.El programa desarrollado ha sido validado mediante la comparación de los resultados obtenidos con los respectivos resultados analíticos, obteniéndose diferencias entre los mismos muy pequeñas o despreciables. Además, el programa incorpora un método de control del volumen de sedimento presente dentro del sistema (basado en el método Boundary Mass Flux Control) que minimiza y corrige el error producido bajo condiciones donde domina la componente advectiva del transporte (números de Grid- Peclet superiores a 1) y que el método Euleriano utilizado no controla." -- TDX
Audience Level
Audience Level
  Kids General Special  
Audience level: 0.95 (from 0.93 for Forward nu ... to 0.96 for Combining ...)