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Journal of Geophysical Research: Earth Surface (2003–2012)

Cover image for Journal of Geophysical Research: Earth Surface (2003–2012)

June 2011

Volume 116, Issue F2

Currently known as: Journal of Geophysical Research: Earth Surface

    1. You have free access to this content
      Flow at ice-divide triple junctions: 1. Three-dimensional full-Stokes modeling

      Fabien Gillet-Chaulet and Richard C. A. Hindmarsh

      Article first published online: 30 JUN 2011 | DOI: 10.1029/2009JF001611

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      Key Points

      • Three-dimensional full-system modeling of ice domes
      • Showing basic patterns of isochrone architecture
      • Fit to surface around summit
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      Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys

      Richard C. A. Hindmarsh, Edward C. King, Robert Mulvaney, Hugh F. J. Corr, Gisela Hiess and Fabien Gillet-Chaulet

      Article first published online: 30 JUN 2011 | DOI: 10.1029/2009JF001622

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      Key Points

      • Radar surveys of ice divide domes
      • Processing method to create 3-D structure
      • Timescale and thinning history of Fletcher Promontory
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      Changes in the dynamics of marine terminating outlet glaciers in west Greenland (2000–2009)

      Ellyn M. McFadden, Ian M. Howat, Ian Joughin, Ben E. Smith and Yushin Ahn

      Article first published online: 23 JUN 2011 | DOI: 10.1029/2010JF001757

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      Key Points

      • Asynchronous changes in west Greenland glacier dynamics occurred from 2000–2009
      • Glaciers with grounded termini had pronounced changes in dynamics
      • The time between large retreat and surface stabilization is related to slope
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      Numerical methods for nonlinear hillslope transport laws

      J. Taylor Perron

      Article first published online: 17 JUN 2011 | DOI: 10.1029/2010JF001801

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      Key Points

      • Explicit methods for hillslope evolution require impractically short time steps
      • A new implicit method offers similar accuracy and allows much longer time steps
      • The implicit method makes it easier to couple hillslopes to incising channels
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      A generalized power law approximation for fluvial incision of bedrock channels

      Nicole M. Gasparini and Mark T. Brandon

      Article first published online: 17 JUN 2011 | DOI: 10.1029/2009JF001655

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      Key Points

      • Bedrock incision follows a power law function of drainage area and slope
      • Scaling exponents in the power law incision function may vary amongst landscapes
      • Uplift patterns may affect the sensitivity of fluvial incision to climate
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      Hillslope-glacier coupling: The interplay of topography and glacial dynamics in High Asia

      Dirk Scherler, Bodo Bookhagen and Manfred R. Strecker

      Article first published online: 14 JUN 2011 | DOI: 10.1029/2010JF001751

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      Key Points

      • Glacial dynamics coupled to hillslope processes
      • Hillslope-glacier coupling increases with landscape steepness
      • Conceptual model of glacial landscape development including hillslopes
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      Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3-D numerical ice flow model

      Gwendolyn J.-M. C. Leysinger Vieli, Richard C. A. Hindmarsh, Martin J. Siegert and Sun Bo

      Article first published online: 11 JUN 2011 | DOI: 10.1029/2010JF001785

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      Key Points

      • First large-scale 3-D model of isochrones
      • Extensive sensitivity study of controlling parameters
      • Change in accumulation pattern
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      Probability distributions for bed form–dominated bed load transport: The Hamamori distribution revisited

      Jens M. Turowski

      Article first published online: 10 JUN 2011 | DOI: 10.1029/2010JF001803

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      Key Points

      • The derivation of the Hamamori distribution is described and corrected
      • The derivation is generalized
      • The derived functions are compared to data
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      Detailed DEM analysis of a rockslide scar to characterize the basal sliding surface of active rockslides

      Thierry Oppikofer, Michel Jaboyedoff, Andrea Pedrazzini, Marc-Henri Derron and Lars Harald Blikra

      Article first published online: 28 MAY 2011 | DOI: 10.1029/2010JF001807

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      Analysis of hydrodynamic lift on a bed sediment particle

      Ambuj Dwivedi, Bruce W. Melville, Asaad Y. Shamseldin and Tushar K. Guha

      Article first published online: 28 MAY 2011 | DOI: 10.1029/2009JF001584

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      Key Points

      • Hydrodynamic forces on bed sediment particle
      • Probability density function of lift force
      • Spectral density function of lift force
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      Cumulative versus transient shoreline change: Dependencies on temporal and spatial scale

      Eli Lazarus, Andrew Ashton, A. Brad Murray, Sarah Tebbens and Stephen Burroughs

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2010JF001835

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      Key Points

      • Shoreline change on a sandy coast can be described as a self-affine signal
      • Cumulative changes are important to large-scale shifts in shoreline position
      • A characteristic timescale may exert control on scales of shoreline change
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      The accretion of aeolian dust in soils of the San Juan Mountains, Colorado, USA

      Corey R. Lawrence, Jason C. Neff and G. Lang Farmer

      Article first published online: 20 MAY 2011 | DOI: 10.1029/2010JF001899

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      Key Points

      • Aeolian dust has accreted in soils of the southern Rocky Mountains
      • Dust accounts for 10% to 40% of the total soil mass in alpine soils
      • Dust accretion likely influences soil particle size, hydrology, and geochemistry
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      Modeling the flow of glaciers in steep terrains: The integrated second-order shallow ice approximation (iSOSIA)

      David L. Egholm, Mads F. Knudsen, Chris D. Clark and Jerome E. Lesemann

      Article first published online: 18 MAY 2011 | DOI: 10.1029/2010JF001900

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      Key Points

      • The iSOSIA is a computationally efficient one-layer ice sheet model framework
      • The iSOSIA is especially designed for providing increased accuracy in steep terrain
      • The use of depth-averaged strain rates is essential for iSOSIA's high accuracy
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      Space-time dynamics of depositional systems: Experimental evidence and theoretical modeling of heavy-tailed statistics

      Vamsi Ganti, Kyle M. Straub, Efi Foufoula-Georgiou and Chris Paola

      Article first published online: 12 MAY 2011 | DOI: 10.1029/2010JF001893

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      Key Points

      • Establishes the presence of heavy-tailed statistics in depositional systems
      • Truncations of heavy-tailed governed by channel depths
      • Modeling using fractional differential equations
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      Isotope thermometry in melt-affected ice cores

      T. Moran, S. J. Marshall and M. J. Sharp

      Article first published online: 30 APR 2011 | DOI: 10.1029/2010JF001738

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      Key Points

      • Summertime melt at ice core sites can lead to enrichment of isotopic values
      • Isotopic enrichment results in overestimation of ice core-derived temperatures
      • Correction of isotopic enrichment improves temperature estimates
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      Process-based, morphodynamic hindcast of decadal deposition patterns in San Pablo Bay, California, 1856–1887

      M. van der Wegen, B. E. Jaffe and J. A. Roelvink

      Article first published online: 22 APR 2011 | DOI: 10.1029/2009JF001614

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      Key Points

      • Approach leads to significant skill in describing decadal morphologic evolution
      • Approach distinguishes governing processes from secondary processes
      • Model results are not sensitive to parameter variations within reasonable range
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      Pullout tests of root analogs and natural root bundles in soil: Experiments and modeling

      M. Schwarz, D. Cohen and D. Or

      Article first published online: 22 APR 2011 | DOI: 10.1029/2010JF001753

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      Key Points

      • Quantify behaviors of pulled root bundles
      • Consider roots in slope stability analysis
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      A Bayesian network to predict coastal vulnerability to sea level rise

      Benjamin T. Gutierrez, Nathaniel G. Plant and E. Robert Thieler

      Article first published online: 22 APR 2011 | DOI: 10.1029/2010JF001891

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      Key Points

      • Bayesian networks provide a good way to approach shoreline change prediction
      • Probability of shoreline change increases with sea level rise
      • Probabilistic approaches are useful for quantifying uncertainties of outcomes
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      Late Quaternary slip rate of the southern Elsinore fault, Southern California: Dating offset alluvial fans via 230Th/U on pedogenic carbonate

      Kathryn E. K. Fletcher, Thomas K. Rockwell and Warren D. Sharp

      Article first published online: 20 APR 2011 | DOI: 10.1029/2010JF001701

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      Key Points

      • Reliable dates for alluvial fans were determined via U-series on soils
      • We have determined a late Quaternary slip rate for the Elsinore fault
      • Our new slip rate implies a slip rate gradient on the Elsinore fault
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      Analysis of antidune migration direction

      Francisco Núñez-González and Juan P. Martín-Vide

      Article first published online: 16 APR 2011 | DOI: 10.1029/2010JF001761

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      Key Points

      • A new theory is presented for explaining the direction of movement of antidunes
      • Theory is based on a simplified analysis of flow hydraulics over antidunes
      • Downstream-migrating antidunes could be steeper than upstream-migrating
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      Testing fluvial erosion models using the transient response of bedrock rivers to tectonic forcing in the Apennines, Italy

      M. Attal, P. A. Cowie, A. C. Whittaker, D. Hobley, G. E. Tucker and G. P. Roberts

      Article first published online: 16 APR 2011 | DOI: 10.1029/2010JF001875

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      Key Points

      • Channel width is slope dependent and uplift dependent in the study area
      • Detachment-limited model with channel adjustment and threshold fits river profiles
      • Landscapes uplifted faster have narrower channels and respond faster
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      Sorting out abrasion in a gypsum dune field

      Douglas J. Jerolmack, Meredith D. Reitz and Raleigh L. Martin

      Article first published online: 12 APR 2011 | DOI: 10.1029/2010JF001821

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      Key Points

      • Sorting and abrasion determine grain size distributions
      • Abrasion is demonstrated to occur only for saltating grains
      • Wind field may be collapsed to a single “dune forming wind” velocity
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      Geomechanical response to seasonal gas storage in depleted reservoirs: A case study in the Po River basin, Italy

      P. Teatini, N. Castelletto, M. Ferronato, G. Gambolati, C. Janna, E. Cairo, D. Marzorati, D. Colombo, A. Ferretti, A. Bagliani and F. Bottazzi

      Article first published online: 6 APR 2011 | DOI: 10.1029/2010JF001793

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      Key Points

      • Evaluation of the environmental impact of UGS projects
      • Set-up and calibration of a 3-D FE transversally isotropic geomechanical model
      • PSInSAR analysis to measure vertical/horizontal movements of the land surface
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      Analytical and observational relations between landslide volume and surface area

      A. Klar, E. Aharonov, B. Kalderon-Asael and O. Katz

      Article first published online: 2 APR 2011 | DOI: 10.1029/2009JF001604

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      Key Points

      • Obtained analytical relation between volume and surface area of landslides
      • This analytical relation agrees well with field observations
      • Proposed new graphical interpretation of factor of safety

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