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Calving seismicity from iceberg–sea surface interactionsT. C. Bartholomaus, C. F. Larsen, S. O'Neel and M. E. West
Article first published online: 22 DEC 2012 | DOI: 10.1029/2012JF002513
Key Points
- Icequakes from calving events dominate the seismic wavefield at Yahtse Glacier
- Iceberg interactions with the fjord create the largest amplitude icequakes
- These seismogenic processes may be common at many calving glaciers
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Numerical analysis of the effect of momentum ratio on the dynamics and sediment-entrainment capacity of coherent flow structures at a stream confluenceGeorge Constantinescu, Shinjiro Miyawaki, Bruce Rhoads and Alexander Sukhodolov
Article first published online: 13 DEC 2012 | DOI: 10.1029/2012JF002452
Key Points
- Streamwise oriented vortical cells act as a pump of momentum and mass
- Cores of streamwise oriented vortical cells are subject to bimodal oscillations
- Streamwise oriented vortical cells and mixing interface cells control entrainment
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A new approach for simulating the redistribution of soil particles by water erosion: A marker-in-cell modelJames R. Cooper, John Wainwright, Anthony J. Parsons, Yuichi Onda, Tomomi Fukuwara, Eiichiro Obana, Ben Kitchener, Edward J. Long and Graham H. Hargrave
Article first published online: 6 DEC 2012 | DOI: 10.1029/2012JF002499
Key Points
- Developed a new soil-erosion model for hillslopes, a marker-in-cell model
- Recreates key aspects of hydrology, hydraulics, and spatial distribution of soil
- Provides a key feedback to our understanding of soil erosion processes
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How do vegetation bands form in dry lands? Insights from numerical modeling and field studies in southern Nevada, USAJon D. Pelletier, Stephen B. DeLong, Caitlin A. Orem, Patricio Becerra, Kathleen Compton, Katrina Gressett, John Lyons-Baral, Luke A. McGuire, Jamie L. Molaro and Joshua C. Spinler
Article first published online: 5 DEC 2012 | DOI: 10.1029/2012JF002465
Key Points
- Ponded water acts to limit plant growth in the spacing between vegetation bands
- Vegetation band spacing is controlled by accommodation space for ponded water
- The relationship between band spacing and slope in S NV supports the model
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Correction to “Nature of deformation of sandy bed forms”Brandon McElroy and David Mohrig
Article first published online: 27 NOV 2012 | DOI: 10.1029/2012JF002642
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Mapping gravel bed river bathymetry from spaceC. J. Legleiter and B. T. Overstreet
Article first published online: 21 NOV 2012 | DOI: 10.1029/2012JF002539
Key Points
- Spectrally-based depth retrieval from satellite images of rivers is feasible
- Water column optical properties constrain bathymetric precision and range
- Band ratio algorithm yields reliable depth estimates in clear-flowing streams
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Ice flow sensitivity to geothermal heat flux of Pine Island Glacier, AntarcticaE. Larour, M. Morlighem, H. Seroussi, J. Schiermeier and E. Rignot
Article first published online: 16 NOV 2012 | DOI: 10.1029/2012JF002371
Key Points
- Uncertainty analysis of the forward propagation of geothermal heat flux errors
- Sensitivity of mass balance to geothermal heat flux errors
- How do errors in thickness compare to errors in geothermal heat flux
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Downstream hydraulic geometry of a tidally influenced river deltaM. G. Sassi, A. J. F. Hoitink, B. de Brye and E. Deleersnijder
Article first published online: 14 NOV 2012 | DOI: 10.1029/2012JF002448
Key Points
- Hydraulic geometry concept applied to a mixed river-tide dominated delta
- River-dominated part of a channel network has a consistent hydraulic geometry
- Tide-dominated channels impacted by nonlinear river-tide interactions
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Modeling wood dynamics, jam formation, and sediment storage in a gravel-bed streamB. C. Eaton, M. A. Hassan and S. L. Davidson
Article first published online: 14 NOV 2012 | DOI: 10.1029/2012JF002385
Key Points
- Our stochastic model predicts wood loads that are consistent with field data
- We have simulated reasonable LW jam dynamics on the basis of simple physical rules
- Our model relates wood loads to channel morphology characteristics
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A network model for prediction and diagnosis of sediment dynamics at the watershed scaleSopan Patil, Murugesu Sivapalan, Marwan A. Hassan, Sheng Ye, Ciaran J. Harman and Xiangyu Xu
Article first published online: 9 NOV 2012 | DOI: 10.1029/2012JF002400
Key Points
- The model characterizes sediment export from hillslope to watershed scale
- Semi-distributed configuration enables process diagnosis across multiple scales
- Differences in coarse and fine sediment movement influence export patterns
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Southern Weddell Sea shelf edge geomorphology: Implications for gully formation by the overflow of high-salinity waterJ. A. Gales, R. D. Larter, N. C. Mitchell, C.-D. Hillenbrand, S. Østerhus and D. R. Shoosmith
Article first published online: 9 NOV 2012 | DOI: 10.1029/2012JF002357
Key Points
- New data show U-shaped gullies form on the Weddell Sea continental shelf edge
- Cold, dense water overflow does not deeply incise the Weddell Sea shelf edge
- Highly incised V-shaped gullies are not formed by cold, dense water overflow
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Flow processes near smooth and rough (concave) outer banks in curved open channelsK. Blanckaert, A. Duarte, Q. Chen and A. J. Schleiss
Article first published online: 3 NOV 2012 | DOI: 10.1029/2012JF002414
Key Points
- Amplification of outer-bank cell of secondary flow with bank roughness
- Discussion of morphological relevance of outer-bank cell
- Presentation of first benchmark data near rough bank for model validation
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Drainage subsidence associated with Arctic permafrost degradationK. C. Lewis, G. A. Zyvoloski, B. Travis, C. Wilson and J. Rowland
Article first published online: 2 NOV 2012 | DOI: 10.1029/2011JF002284
Key Points
- A simple 1-D analytic model is useful for the study of Arctic drainage subsidence
- The analytic model gives key variable combinations characterizing the system
- Numerical simulations extend the results of the analytic model
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The influence of snow cover thickness on the thermal regime of Tête Rousse Glacier (Mont Blanc range, 3200 m a.s.l.): Consequences for outburst flood hazards and glacier response to climate changeA. Gilbert, C. Vincent, P. Wagnon, E. Thibert and A. Rabatel
Article first published online: 2 NOV 2012 | DOI: 10.1029/2011JF002258
Key Points
- Relation between snow/firn cover and thermal regime of the glacier
- Link between thermal regime and outburst flood hazards
- Thermal impact of climate change on the glacier
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Coupled dynamics of the co-evolution of gravel bed topography, flow turbulence and sediment transport in an experimental channelArvind Singh, Efi Foufoula-Georgiou, Fernando Porté-Agel and Peter R. Wilcock
Article first published online: 27 OCT 2012 | DOI: 10.1029/2011JF002323
Key Points
- Asymm. pdfs of bed elevation increments and instant. Reynolds stress parametrized
- Multiscale structure of gravel bed forms is characterized and parametrized
- Relationship between sediment transport rates and instant. Reynolds stress is proposed
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Wind-formed gravel bed forms, Wright Valley, AntarcticaJohn A. Gillies, William G. Nickling, Michael Tilson and Eden Furtak-Cole
Article first published online: 27 OCT 2012 | DOI: 10.1029/2012JF002378
Key Points
- Unique aeolian bed form
- Form evolution over centuries
- Highly intermittent process of formation
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River profile controls on channel morphology, debris flow disturbance, and the spatial extent of salmonids in steep mountain streamsChristine L. May and Thomas E. Lisle
Article first published online: 27 OCT 2012 | DOI: 10.1029/2011JF002324
Key Points
- Geomorphic process domains link to the spatial distribution of salmon
- Steepness and concavity indexes of river profiles are predictors of fish habitat
- Reach morphology and disturbance potential can be inferred from river profiles
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Bedload transport of a bimodal sediment bedM. Houssais and E. Lajeunesse
Article first published online: 25 OCT 2012 | DOI: 10.1029/2012JF002490
Key Points
- Bedload laws are similar whether the bed is a uniform or a bimodal mixture
- Only the critical shear stress is sensitive to the grain sizes distribution
- The model of Lajeunesse (2010) is generalized to the case of a bimodal mixture
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Mechanism of secondary currents in open channel flowsShu-Qing Yang, Soon Keat Tan and Xi-Kun Wang
Article first published online: 19 OCT 2012 | DOI: 10.1029/2012JF002510
Key Points
- The mechanism of secondary currents were proposed
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Modeling supraglacial water routing and lake filling on the Greenland Ice SheetAlison F. Banwell, Neil S. Arnold, Ian C. Willis, Marco Tedesco and Andreas P. Ahlstrøm
Article first published online: 18 OCT 2012 | DOI: 10.1029/2012JF002393
Key Points
- To link a distributed melt model to a distributed hydrology model
- To model the filling of a supraglacial lake on the Greenland Ice Sheet
- To provide distributed inputs for subglacial models in the future
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Icequake locations and discrimination of source and path effects with small aperture arrays, Bering Glacier terminus, AKJoshua P. Richardson, Gregory P. Waite, Wayne D. Pennington, Roger M. Turpening and James M. Robinson
Article first published online: 18 OCT 2012 | DOI: 10.1029/2012JF002405
Key Points
- Differentiation of path and source effects for near-terminus icequakes
- Utility of small-aperture seismic arrays to locate icequakes
- Differences and similarities between iceberg breakup and calving
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Volume and area changes of the Milne Ice Shelf, Ellesmere Island, Nunavut, Canada, since 1950Colleen A. Mortimer, Luke Copland and Derek R. Mueller
Article first published online: 12 OCT 2012 | DOI: 10.1029/2011JF002074
Key Points
- Milne Ice Shelf response to twentieth-century warming
- Thinning as a key contributor to loss of ice shelf mass
- Ice shelf area and volume contraction
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Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core dataF. Pattyn, K. Matsuoka, D. Callens, H. Conway, M. Depoorter, D. Docquier, B. Hubbard, D. Samyn and J. L. Tison
Article first published online: 11 OCT 2012 | DOI: 10.1029/2011JF002154
Key Points
- Multisciplinary approach to understanding ice/ocean interaction
- Evidence for sub-shelf melting at the grounding line
- Evidence of marine ice accretion in adjacent areas
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Correction to “Macroholes in stalagmites and the search for lost water”Nurit Shtober Zisu, Henry P. Schwarcz, Norman Konyer, Tom Chow and Michael D. Noseworthy
Article first published online: 11 OCT 2012 | DOI: 10.1029/2012JF002619
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Distributed ice thickness and volume of all glaciers around the globeMatthias Huss and Daniel Farinotti
Article first published online: 11 OCT 2012 | DOI: 10.1029/2012JF002523
Key Points
- First ice volume assessment of all individual glaciers around the globe
- Novel methodology to estimate glacier ice thickness distribution
- Potential sea level rise of 170,000 glaciers and ice caps worldwide is 0.43 m
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Spatial and temporal variations in Greenland glacial-earthquake activity, 1993–2010Stephen A. Veitch and Meredith Nettles
Article first published online: 9 OCT 2012 | DOI: 10.1029/2012JF002412
Key Points
- Presents source parameters for 121 Greenland glacial earthquakes, 2006-2010
- Examines spatio-temporal evolution of glacial-earthquake activity from 1993-2010
- Links glacial earthquakes to changes in glacier dynamics and grounding state
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Stochastic determination of entrainment risk in uniformly sized sediment beds at low transport stages: 1. TheoryMatteo Tregnaghi, Andrea Bottacin-Busolin, Andrea Marion and Simon Tait
Article first published online: 5 OCT 2012 | DOI: 10.1029/2011JF002134
Key Points
- A probabilistically-based framework for grain entrainment is derived
- The role of near-bed flow-field and bed topography is statistically described
- Fluid forces and grain resistance are assumed to be conditionally independent
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Probabilistic rainfall thresholds for landslide occurrence using a Bayesian approachM. Berti, M. L. V. Martina, S. Franceschini, S. Pignone, A. Simoni and M. Pizziolo
Article first published online: 5 OCT 2012 | DOI: 10.1029/2012JF002367
Key Points
- A probabilistic approach is needed to evaluate landslide rainfall thresholds
- Bayes theorem is suited to this purpose
- Landslide probability is strongly related to the event rainfall
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Stochastic determination of entrainment risk in uniformly sized sediment beds at low transport stages: 2. ExperimentsMatteo Tregnaghi, Andrea Bottacin-Busolin, Simon Tait and Andrea Marion
Article first published online: 5 OCT 2012 | DOI: 10.1029/2011JF002135
Key Points
- Experiments were carried out in a laboratory flume with a 3D PIV system
- Simultaneous flow-velocity and sediment-motion measurements were made
- Comparison between grain-scale data and stochastic theories was first performed
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Is the von Kármán constant affected by sediment suspension?Oscar Castro-Orgaz, Juan V. Giráldez, Luciano Mateos and Subhasish Dey
Article first published online: 3 OCT 2012 | DOI: 10.1029/2011JF002211
Key Points
- Turbulent velocity profile allowing for sediment suspension
- Variable mixing length depending on sediment concentration
- Behavior of the von Karman constant in flows with sediment suspensions
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Micro-topographic analysis of shell pavements formed by aeolian transport in a wind tunnel simulationCheryl McKenna Neuman, Bailiang Li and David Nash
Article first published online: 3 OCT 2012 | DOI: 10.1029/2012JF002381
Key Points
- Beach armouring with shells is an effective control of wind erosion
- Geospatial analyses are presented to evaluate roughness density
- Morphodynamics of the intervening bed surface are important to consider
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Correction to “The physical basis for anomalous diffusion in bed load transport”Raleigh L. Martin, Douglas J. Jerolmack and Rina Schumer
Article first published online: 2 OCT 2012 | DOI: 10.1029/2012JF002608
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Exploring the role of organic matter accumulation on delta evolutionJorge Lorenzo-Trueba, Vaughan R. Voller, Chris Paola, Robert R. Twilley and Azure E. Bevington
Article first published online: 20 JUL 2012 | DOI: 10.1029/2012JF002339
Key Points
- First land building model coupling physical and biogeochemical processes
- A quantitative prediction of field observed patterns of organic fraction
- Demonstration of the role of fresh water supply in delta dynamics
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