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  • Conference paper
    Piggott MD, Gorman GJ, Pain CC, Allison PA, Candy AS, Martin BT, Wells MRet al., 2008,

    A new computational framework for multi-scale ocean modelling based on adapting unstructured meshes

    , 9th ICFD Conference on Numerical Methods for Fluid Dynamics, Pages: 1003-1015

    A new modelling framework is presented for application to a range of three-dimensional (3D) multi-scale oceanographic problems. The approach is based upon a finite element discretization on an unstructured tetrahedral mesh which is optimized to represent highly complex geometries. Throughout a simulation the mesh is dynamically adapted in 3D to optimize the representation of evolving solution structures. The adaptive algorithm makes use of anisotropic measures of solution complexity and a load-balanced parallel mesh optimization algorithm to vary resolution and allow long, thin elements to align with features such as boundary layers. The modelling framework presented is quite different from the majority of ocean models in use today, which are typically based on static-structured grids. Finite element (and volume) methods on unstructured meshes are, however, gaining popularity in the oceanographic community. The model presented here is novel in its use of unstructured meshes and anisotropic adaptivity in 3D, its ability to represent a range of coupled multi-scale solution structures and to simulate non-hydrostatic dynamics. Copyright (C) 2007 John Wiley & Sons, Ltd.

  • Journal article
    Shaw B, Ambraseys NN, England PC, Floyd MA, Gorman GJ, Higham TFG, Jackson JA, Nocquet J-M, Pain CC, Piggott MDet al., 2008,

    Eastern Mediterranean tectonics and tsunami hazard inferred from the AD 365 earthquake

    , Nature Geoscience, Vol: 1, Pages: 268-276
  • Report
    Jackson CA-L, Kane KE, Kieft RL, Hampson GJet al., 2008,

    Academia-Industry Collaboration Provides an Improved Understanding of Rift Basin Development in the South Viking Graben, Offshore Norway

    , AAPG European Newsletter (Vol. 3), Publisher: AAPG
  • Journal article
    Goes S, Capitanio FA, Morra G, 2008,

    Evidence of lower-mantle slab penetration phases in plate motions

    , NATURE, Vol: 451, Pages: 981-984, ISSN: 0028-0836
  • Journal article
    Busby CJ, Hagan JC, Putirka K, Pluhar CJ, Gans PB, Wagner DL, Rood D, DeOreo SB, Skilling Iet al., 2008,

    The ancestral cascades arc: Cenozoic evolution of the central Sierra Nevada (California) and the birth of the new plate boundary

    , Special Paper of the Geological Society of America, Vol: 438, Pages: 331-378, ISSN: 0072-1077

    We integrate new stratigraphic, structural, geochemical, geochronological, and magnetostratigraphic data on Cenozoic volcanic rocks in the central Sierra Nevada to arrive at closely inter-related new models for: (1) the paleogeography of the ancestral Cascades arc, (2) the stratigraphic record of uplift events in the Sierra Nevada, (3) the tectonic controls on volcanic styles and compositions in the arc, and (4) the birth of a new plate margin. Previous workers have assumed that the ancestral Cascades arc consisted of stratovolcanoes, similar to the modern Cascades arc, but we suggest that the arc was composed largely of numerous, very small centers, where magmas frequently leaked up strands of the Sierran frontal fault zone. These small centers erupted to produce andesite lava domes that collapsed to produce block-and-ash flows, which were reworked into paleocanyons as volcanic debris flows and streamflow deposits. Where intrusions rose up through water-saturated paleocanyon fill, they formed peperite complexes that were commonly destabilized to form debris flows. Paleocanyons that were cut into Cretaceous bedrock and filled with Oligocene to late Miocene strata not only provide a stratigraphic record of the ancestral Cascades arc volcanism, but also deep unconformities within them record tectonic events. Preliminary correlation of newly mapped unconformities and new geochronological, magnetostratigraphic, and structural data allow us to propose three episodes of Cenozoic uplift that may correspond to (1) early Miocene onset of arc magmatism (ca. 15 Ma), (2) middle Miocene onset of Basin and Range faulting (ca. 10 Ma), and (3) late Miocene arrival of the triple junction (ca. 6 Ma), perhaps coinciding with a second episode of rapid extension on the range front. Oligocene ignimbrites, which erupted from calderas in central Nevada and filled Sierran paleocanyons, were deeply eroded during the early Miocene uplift event. The middle Miocene event is recorded by growth f

  • Journal article
    Jonoud S, Jackson MD, 2008,

    New criteria for the validity of steady-state upscaling

    , TRANSPORT IN POROUS MEDIA, Vol: 71, Pages: 53-73, ISSN: 0169-3913
  • Conference paper
    Kontoe S, Zdravkovic L, Potts DM, 2008,

    The importance of revised modulus decay curves on surface foundation settlement predictions in London Clay

    , BGA International Conference on Foundations, Pages: 1549-1558
  • Journal article
    Burberry CM, Cosgrove JW, Liu JG, 2008,

    Spatial arrangement of fold types in the Zagros Simply Folded Belt, Iran, indicated by landform morphology and drainage pattern characteristics

    , JOURNAL OF MAPS, Vol: 4, Pages: 417-430, ISSN: 1744-5647
  • Conference paper
    Strasser FO, Stafford PJ, Bommer JJ, Erdik Met al., 2008,

    State-of-the-art of European earthquake loss estimation software

    , 14th World Conference on Earthquake Engineering
  • Conference paper
    Málaga-Chuquitaype C, Bommer JJ, Pinho R, Stafford PJet al., 2008,

    Selection and scaling of ground-motion records for nonlinear response-history analyses based on equivalent SDOF systems

    , 14th World Conference on Earthquake Engineering
  • Conference paper
    Zdravkovic L, Kontoe S, 2008,

    Some issues in modelling boundary conditions in dynamic geotechnical analysis

    , 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Pages: 2918-2925
  • Journal article
    Jonoud S, Jackson MD, 2008,

    Validity of Steady-State Upscaling Techniques

    , SPE Reservoir Evaluation and Engineering, Vol: April, Pages: 405-416
  • Conference paper
    Kontoe S, Zdravkovic L, Potts DM, 2008,

    The generalised-alpha algorithm for dynamic coupled consolidation problems in geotechnical engineering

    , 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Pages: 1449-1558
  • Journal article
    Bell RE, McNeill LC, Bull JM, Henstock TJet al., 2008,

    Evolution of the offshore western Gulf of Corinth

    , GSA Bulletin, Vol: 120, Pages: 156-178
  • Conference paper
    Bell RE, 2008,

    Seismic reflection character of the Hikurangi subduction interface, New Zealand, in the region of repeated Gisborne slow slip events

    , AGU Fall Meeting
  • Journal article
    Cowie PA, Whittaker AC, Attal M, Tucker GE, Roberts GP, Ganas Aet al., 2008,

    New constraints on sediment-flux dependent river incision: Implications for extracting tectonic signals from river profiles.

    , Geology, Vol: 36, Pages: 535-538, ISSN: 0091-7613
  • Journal article
    Attal M, Tucker GE, Whittaker AC, Cowie PA, Roberts GPet al., 2008,

    Modelling fluvial incision and transient landscape evolution: influence of dynamic channel adjustment

  • Conference paper
    Taborda D, Zdravkovic L, Kontoe S, Potts DMet al., 2008,

    Comparative study of cyclic nonlinear elastic models in dynamic finite element analysis

    , Coimbra, Portugal, XI National Conference on Geotechnics, Pages: 147-154
  • Journal article
    Stafford PJ, Mendis R, Bommer JJ, 2008,

    The dependence of damping correction factors for response spectra on duration and numbers of cycles

    , Journal of Structural Engineering - ASCE, Vol: 134, Pages: 1364-1373, ISSN: 0733-9445
  • Journal article
    Kontoe S, Zdravkovic L, Potts DM, Menkiti COet al., 2008,

    Case study on seismic tunnel response

    , Canadian Geotechnical Journal, Vol: 45, Pages: 1743-1764

    This paper presents a case study of the Bolu highway twin tunnels that experienced a wide range of damage during the 1999 Duzce earthquake in Turkey. Attention is focused on a particular section of the left tunnel that was still under construction when the earthquake struck and that experienced extensive damage during the seismic event. Static and dynamic plane strain finite element (FE) analyses were undertaken to investigate the seismic tunnel response at two sections and to compare the results with the post-earthquake field observations. The predicted maximum total hoop stress during the earthquake exceeds the strength of shotcrete in the examined section. The occurrence of lining failure and the predicted failure mechanism compare very favourably with field observations. The results of the dynamic FE analyses are also compared with those obtain by simplified methodologies (i.e. two analytical elastic solutions and quasi-static elasto-plastic FE analyses). For this example, the quasi-static racking analysis gave thrust and bending moment distributions around the lining that differed significantly from those obtained from full dynamic analyses. However, the resulting hoop stress distributions were in reasonable agreement.

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