A three-dimensional dynamical model of Amundsenisen icefield, Svalbard.

Otero García, Jaime; Navarro Valero, Francisco Jose; Lapazaran Izargain, Javier Jesús; Vasilenko, Evgeniy y Glowacki, Piotr (2011). A three-dimensional dynamical model of Amundsenisen icefield, Svalbard.. En: "European Geosciences Union General Assembly 2011", 03/04/2011 - 08/04/2011, Viena, Austria. p. 1.

Descripción

Título: A three-dimensional dynamical model of Amundsenisen icefield, Svalbard.
Autor/es:
  • Otero García, Jaime
  • Navarro Valero, Francisco Jose
  • Lapazaran Izargain, Javier Jesús
  • Vasilenko, Evgeniy
  • Glowacki, Piotr
Tipo de Documento: Ponencia en Congreso o Jornada (Póster)
Título del Evento: European Geosciences Union General Assembly 2011
Fechas del Evento: 03/04/2011 - 08/04/2011
Lugar del Evento: Viena, Austria
Título del Libro: Proceedings of the European Geosciences Union General Assembly 2011
Fecha: 2011
Volumen: 13
Materias:
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Matemática Aplicada a las Tecnologías de la Información [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Amundsenisen is an ice field, 80 km2 in area, located in Southern Spitsbergen, Svalbard. Radio-echo sounding measurements at 20 MHz show high intensity returns from a nearly flat basal reflector at four zones, all of them with ice thickness larger than 500m. These reflections suggest possible subglacial lakes. To determine whether basal liquid water is compatible with current pressure and temperature conditions, we aim at applying a thermo mechanical model with a free boundary at the bed defined as solution of a Stefan problem for the interface ice-subglaciallake. The complexity of the problem suggests the use of a bi-dimensional model, but this requires that well-defined flowlines across the zones with suspected subglacial lakes are available. We define these flow lines from the solution of a three-dimensional dynamical model, and this is the main goal of the present contribution. We apply a three-dimensional full-Stokes model of glacier dynamics to Amundsenisen icefield. We are mostly interested in the plateau zone of the icefield, so we introduce artificial vertical boundaries at the heads of the main outlet glaciers draining Amundsenisen. At these boundaries we set velocity boundary conditions. Velocities near the centres of the heads of the outlets are known from experimental measurements. The velocities at depth are calculated according to a SIA velocity-depth profile, and those at the rest of the transverse section are computed following Nye’s (1952) model. We select as southeastern boundary of the model domain an ice divide, where we set boundary conditions of zero horizontal velocities and zero vertical shear stresses. The upper boundary is a traction-free boundary. For the basal boundary conditions, on the zones of suspected subglacial lakes we set free-slip boundary conditions, while for the rest of the basal boundary we use a friction law linking the sliding velocity to the basal shear stress,in such a way that, contrary to the shallow ice approximation, the basal shear stress is not equal to the basal driving stress but rather part of the solution.

Más información

ID de Registro: 12631
Identificador DC: http://oa.upm.es/12631/
Identificador OAI: oai:oa.upm.es:12631
URL Oficial: http://meetings.copernicus.org/egu2011/
Depositado por: Memoria Investigacion
Depositado el: 02 Ago 2012 08:27
Ultima Modificación: 21 Abr 2016 11:54
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