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  • Journal article
    Cobden L, Goes S, Ravenna M, Styles E, Cammarano F, Gallagher K, Connolly JADet al., 2009,

    Thermochemical interpretation of 1-D seismic data for the lower mantle: The significance of nonadiabatic thermal gradients and compositional heterogeneity

    , JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 114, ISSN: 2169-9313
  • Conference paper
    Tsiampousi A, Zdravkovic L, Potts DM, 2009,

    Modelling of overconsolidated unsaturated soils

    , 4th Asia Pacific Conference on Unsaturated Soils, Publisher: CRC Press, Pages: 673-678

    Constitutive models for unsaturated soils are most commonly based on conventional critical state type models for saturated soils. The effect of partial saturation is taken into account through the intro-duction of an additional stress variable which depends on soil suction. The modified Cam-Clay surface is usu-ally assumed for the formulation of the yield and the plastic potential surfaces in the mean stress – deviatoric stress space. In this paper an existing model for unsaturated soils is used to simulate drained triaxial tests per-formed on highly overconsolidated unsaturated silt. Even though the model adopts an improved expression for the yield surface that allows a variety of shapes to be introduced, none of them can accurately simulate the observed soil behaviour in the laboratory tests. A new version of the model is, therefore, proposed and pre-sented here. Following the formulation and implementation of these alterations, analyses of laboratory ex-periments on artificial silt are presented demonstrating the improved simulation of soil behaviour.
  • Journal article
    Bland PA, Jackson MD, Coker RF, Cohen BA, Webber JBW, Lee MR, Duffy CM, Chater RJ, Ardakani MG, McPhail DS, McComb DW, Benedix GKet al., 2009,

    Why aqueous alteration in asteroids was isochemical: High porosity not equal high permeability

    , EARTH AND PLANETARY SCIENCE LETTERS, Vol: 287, Pages: 559-568, ISSN: 0012-821X
  • Journal article
    Fang F, Pain CC, Navon IM, Gorman GJ, Piggott MD, Allison PA, Goddard AJHet al., 2009,

    A POD goal-oriented error measure for mesh optimization

    , International Journal for Numerical Methods in Fluids, Vol: 63, Pages: 185-206, ISSN: 1097-0363

    The approach for designing an error measure to guide an adaptive meshing algorithm proposed in Power et al. (Ocean Modell. 2006; 15:3-38) is extended to use a POD adjoint-based method, thus facilitating efficient primal and adjoint integration in time. The aim is to obtain a new mesh that can adequately resolve all the fields at all time levels, with optimal (w.r.t. the functional) efficiency. The goal-based method solves both the primal and adjoint equations to form the overall error norms, in the form of a metric tensor. The tetrahedral elements are then optimized so that they have unit size in Riemannian space defined with respect to the metric tensor.This is the first attempt to use POD to estimate an anisotropic error measure. The metric tensor field can be used to direct anisotropic mesh adaptivity. The resulting mesh is optimized to efficiently represent the solution fields over a given time period. The calculation of the error measures is carried out in the reduced space. The POD approach facilitates efficient integration backwards in time and yields the sensitivity analysis necessary for the goal-based error estimates. The accuracy of both the primal and adjoint-reduced models is thus optimized (through the use of anisotropic mesh adaptivity). In addition, the functional for optimizing meshes has been designed to be consistent with that for 4D Var data assimilation.
  • Journal article
    Zhu B, Jardine RJ, Foray P, 2009,

    THE USE OF MINIATURE SOIL STRESS MEASURING CELLS IN LABORATORY APPLICATIONS INVOLVING STRESS REVERSALS

    , SOILS AND FOUNDATIONS, Vol: 49, Pages: 675-688, ISSN: 0038-0806
  • Journal article
    Getsinger A, Rushmer T, Jackson MD, Baker Det al., 2009,

    Generating High Mg-numbers and Chemical Diversity in Tonalite-Trondhjemite-Granodiorite (TTG) Magmas during Melting and Melt Segregation in the Continental Crust

    , JOURNAL OF PETROLOGY, Vol: 50, Pages: 1935-1954, ISSN: 0022-3530
  • Journal article
    Jardine RJ, Zhu B, Foray P, Dalton CPet al., 2009,

    EXPERIMENTAL ARRANGEMENTS FOR INVESTIGATION OF SOIL STRESSES DEVELOPED AROUND A DISPLACEMENT PILE

    , SOILS AND FOUNDATIONS, Vol: 49, Pages: 661-673, ISSN: 0038-0806
  • Journal article
    Kenkmann T, Collins GS, Wittmann A, Wünnemann K, Reimold WU, Melosh HJet al., 2009,

    A model for the formation of the Chesapeake Bay impact crater as revealed by drilling and numerical simulation

    , Geological Society of America Special Paper, Vol: 458, Pages: 571-586
  • Journal article
    Hampson GJ, Sixsmith PJ, Kieft RL, Jackson CA-L, Johnson HDet al., 2009,

    Quantitative analysis of net-transgressive shoreline trajectories and stratigraphic architectures: mid-to-late Jurassic of the North Sea rift basin

    , Basin Research, Vol: 21, Pages: 528-558, ISSN: 0950-091X
  • Journal article
    Sech RP, Jackson MD, Hampson GJ, 2009,

    Three-dimensional modeling of a shoreface-shelf parasequence reservoir analog: Part 1. Surface-based modeling to capture high-resolution facies architecture

    , AAPG BULLETIN, Vol: 93, Pages: 1155-1181, ISSN: 0149-1423
  • Journal article
    Jackson MD, Hampson GJ, Sech RP, 2009,

    Three-dimensional modeling of a shoreface-shelf parasequence reservoir analog: Part 2. Geologic controls on fluid flow and hydrocarbon recovery

    , AAPG Bulletin, Vol: 93, Pages: 1183-1208, ISSN: 0149-1423
  • Journal article
    Jackson CA-L, Johnson HD, 2009,

    Sustained turbidity currents and their interaction with debrite-related topography; Labuan Island, offshore NW Borneo, Malaysia

    , Sedimentary Geology, Vol: 219, Pages: 77-96

    The Temburong Fm (Early Miocene), Labuan Island, offshore NW Borneo, was deposited in a lower-slope to proximal basin-floor setting, and provides an opportunity to study the deposits of sustained turbidity currents and their interaction with debrite-related slope topography. Two main gravity-flow facies are identified; (i) slump-derived debris-flow deposits (debrites) - characterised by ungraded silty mudstones in 1.5 to >60 m thick beds which are rich in large (>5 m) lithic clasts; and (ii) turbidity current deposits (turbidites) - characterised by medium-grained sandstone in beds up to 2 m thick, which contain structureless (Ta) intervals alternating with planar-parallel (Tb) and current-ripple (Tc) laminated intervals. Laterally discontinuous, cobble-mantled scours are also locally developed within turbidite beds. Based on these characteristics, these sandstones are interpreted as having been deposited from sustained turbidity currents. Cobble-mantled scours indicate periods of intense turbidity current waxing. The sustained turbidity currents are interpreted to have been derived from retrogressive collapse of sand-rich mouth bars (breaching) or directly from river effluent (hyperpycnal flow). Analysis of the stratal architecture of the two facies indicates that routing of the turbidity currents was influenced by topographic relief developed at the top of underlying debrite Turbidite beds are locally eroded at the base of an overlying debrite, possibly due to clast-related substrate ‘ploughing’ during the latter flow event. This study highlights the difficulty in constraining the origin of sustained turbidity currents in ancient sedimentary sequences. In addition, this study documents the importance large debrites may have in generating topography on submarine slopes and influencing routing of subsequent turbidity current and the geometry of their associated deposits.
  • Conference paper
    Barmpopoulos IH, Ho TYK, Jardine RJ, Anh-Minh Net al., 2009,

    The large displacement shear characteristics of granular media against concrete and steel interfaces

    , Amsterdam, Research Symposium on the Characterization and Behavior of Interfaces (CBI), Publisher: IOS Press, Pages: 17-24
  • Book
    Liu JG, Mason P, 2009,

    Essential Image Processing and GIS for Remote Sensing

    , UK 9780470510322, Publisher: Wiley, ISBN: 9780470510322

    Essential Image Processing and GIS for Remote Sensing is an accessible overview of the subject and successfully draws together these three key areas in a ...
  • Conference paper
    Davison TM, Collins GS, Ciesla F, 2009,

    Quantifying heating in porous planetesimal collisions

    , 72nd Annual Meeting of the Meteoritical-Society, Publisher: Meteoritical Society, Pages: A58-A58, ISSN: 1086-9379
  • Conference paper
    Collins GS, Wuennemann K, 2009,

    NUMERICAL MODELING OF IMPACT EJECTION PROCESSES IN POROUS GEOLOGIC MATERIALS

    , 72nd Annual Meeting of the Meteoritical-Society, Publisher: METEORITICAL SOC, Pages: A53-A53, ISSN: 1086-9379
  • Conference paper
    Ciesla FJ, Davison TM, Collins GS, 2009,

    Cooling of porous planetesimals after impacts: Implications for the thermal evolution of primitive bodies

    , 72nd Annual Meeting of the Meteoritical-Society, Publisher: Meteoritical Society, Pages: A51-A51, ISSN: 1086-9379
  • Journal article
    Hwang YK, Ritsema J, Goes S, 2009,

    Spatial variations of P wave attenuation in the mantle beneath North America

    , JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 114, ISSN: 2169-9313
  • Conference paper
    Ciesla FJ, Collins GS, Davison TM, O'Brien DPet al., 2009,

    Collisions among porous planetesimals and the water content of planetary embryos

    , 19th Annual VM Goldschmidt Conference, Publisher: Elsevier, Pages: A227-A227, ISSN: 0016-7037
  • Journal article
    Aguera F, Liu JG, 2009,

    Automatic greenhouse delineation from QuickBird and Ikonos satellite images

    , COMPUTERS AND ELECTRONICS IN AGRICULTURE, Vol: 66, Pages: 191-200, ISSN: 0168-1699

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