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Numerical modelling of Amundsenisen Icefield for compatibility check of a subglacial lake. Preliminary tests
Áreas de investigación
  • Geofísica
Recent GPR data from the Amundsenisen Icefield in Southern Spitsbergen, Svalbard archipelago, exhibit high intensity returns from a nearly flat basal reflector (maximum diameter 500 m) which might correspond to a subglacial lake. Its existence would be an absolute novelty as the other known subglacial lakes are located in Antarctica. The general aim of our research is the identification and verification of necessary conditions for the existence of such a lake. We support our investigation with simulations via an in-house numerical code implementing a mathematical model describing the dynamics and thermodynamics of the icefield and the conjectured lake, the ice-water and the ice-bedrock interfaces. The classical Glen's law is adopted as constitutive relationship for ice, and Large Eddy Simulation modelling is used for subglacial lake hydrodynamics. The ice-water phase change interface is defined via the Stefan equation, and the momentum and heat exchange between ice and water are regulated by corresponding interface jump conditions closing the moving boundary partial differential model. Several environmental variables and their impact on the system are taken into account at the free surface and bottom boundaries (geothermal heat flux, melting at the ice-bedrock interface, air temperature, atmospheric pressure, etc.). We present numerical results of the simulation of a vertical section of the icefield departing from an ice divide and following a flowline obtained as output of an earlier three-dimensional model of the dynamics of Amundsenisen Icefield (Otero et al., 2011)
Nombre congreso
European Geosciences Union General Assembly 2012
Tipo de participación
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Título de las actas
Geophysical Research Abstracts
Esta actividad pertenece a memorias de investigación
  • Autor: Jaime Otero Garcia (UPM)
  • Autor: Francisco Jose Navarro Valero (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Simulación Numérica en Ciencias e Ingeniería
  • Departamento: Matemática Aplicada a las Tecnologías de la Información
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