Search Results - "Ashworth, P. J."

Meander-bend evolution, alluvial architecture, and the role of cohesion in sinuous river channels; a flume study by Peakall, Jeff, Ashworth, Philip J, Best, James L

“…Realistic physical models of meandering rivers have proven extremely difficult to produce, particularly in comparison to the formation of braided rivers in the…”
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Numerical simulation of bar and island morphodynamics in anabranching megarivers by Nicholas, A. P., Ashworth, P. J., Sambrook Smith, G. H., Sandbach, S. D.

“…Bar and island morphodynamics in the world's largest anabranching rivers are investigated using a new numerical model of hydrodynamics, sediment transport,…”
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Three-dimensional sedimentary architecture of a large, mid-channel sand braid bar, Jamuna River, Bangladesh by Best, James L, Ashworth, Philip J, Bristow, Charles S, Roden, Julie

“…The three-dimensional subsurface alluvial architecture of a large (approximately 3 km long, 1 km wide, 12 m high), mid-channel sand braid bar in the Jamuna…”
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The sedimentology and alluvial architecture of the sandy braided South Saskatchewan River, Canada by SAMBROOK SMITH, G. H., ASHWORTH, P. J., BEST, J. L., WOODWARD, J., SIMPSON, C. J.

“…Ground penetrating radar (GPR) surveys of unit and compound braid bars in the sandy South Saskatchewan River, Canada, are used to test the influential facies…”
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Quantification of braided river channel change using archival digital image analysis by Lane, S. N., Widdison, P. E., Thomas, R. E., Ashworth, P. J., Best, J. L., Lunt, I. A., Sambrook Smith, G. H., Simpson, C. J.

“…Historical archives of grey‐scale river channel imagery are extensive. Here, we present and test a methodology to extract detailed quantitative topographic…”
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The sedimentology and alluvial architecture of a large braid bar, Río Paraná, Argentina by Sambrook Smith, Gregory H, Ashworth, Philip J, Best, James L, Lunt, Ian A, Orfeo, Oscar, Parsons, Daniel R

“…This paper presents approximately 30 km of ground penetrating radar (GPR) data from a mid-channel bar in the sixth largest river in the world, the Rio Parana,…”
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The Impact of Nonequilibrium Flow on the Structure of Turbulence Over River Dunes by Unsworth, C. A., Parsons, D. R., Hardy, R. J., Reesink, A. J. H., Best, J. L., Ashworth, P. J., Keevil, G. M.

“…Most past experimental investigations of flow over river dunes have focused on conditions that match semiempirical flow‐depth scaling laws, yet such…”
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Scour in large braided rivers and the recognition of sequence stratigraphic boundaries by Best, James L, Ashworth, Philip J

“…Data from a study of the Jamuna river, Bangladesh, is reported which illustrates that bed scour associated with channel confluences and bends alone can be…”
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The Influence of Three‐Dimensional Topography on Turbulent Flow Structures Over Dunes in Unidirectional Flows by Hardy, R. J., Best, J. L., Marjoribanks, T. I., Parsons, D. R., Ashworth, P. J.

“…Dunes are the most prevalent bedform present in sand‐bedded rivers and their morphology typically comprises multiple scales of three‐dimensional topography…”
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Application of a roughness-length representation to parameterize energy loss in 3-D numerical simulations of large rivers by Sandbach, S. D., Lane, S. N., Hardy, R. J., Amsler, M. L., Ashworth, P. J., Best, J. L., Nicholas, A. P., Orfeo, O., Parsons, D. R., Reesink, A. J. H., Szupiany, R. N.

“…Recent technological advances in remote sensing have enabled investigation of the morphodynamics and hydrodynamics of large rivers. However, measuring…”
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Turbulence and Secondary Flow over Sediment Stripes in Weakly Bimodal Bed Material by McLelland, Stuart J, Ashworth, Philip J, Best, James L, Livesey, John R

“…Longitudinal stripes are a common bed form in heterogeneous alluvial sediments and consist of periodic, spanwise variations in bed texture and elevation that…”
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Survival of ram spermatozoa at high dilution: protective effect of simple constituents of culture media as compared with seminal plasma by Ashworth, P J, Harrison, R A, Miller, N G, Plummer, J M, Watson, P F

“…During incubation of ram spermatozoa at 1 x 10(7) cells mL-1 or less in a simple HEPES-buffered saline medium, high levels of cell death were detected using…”
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Flow cytometric detection of bicarbonate-induced changes in lectin binding in boar and ram sperm populations by Ashworth, P J, Harrison, R A, Miller, N G, Plummer, J M, Watson, P F

“…Boar and ram spermatozoa were incubated in Tyrode's medium in the presence or absence of bicarbonate/CO2, a component believed essential for capacitation. At…”
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Bicarbonate/CO2, and effector of capacitation, induces a rapid and reversible change in the lipid architecture of boar sperm plasma membranes by Harrison, R.A.P. (The Babraham Institute, Babraham, Cambridge, UK.), Ashworth, P.J.C, Miller, N.G.A

“…Bicarbonate/CO2 is believed to be the key in vitro effector of sperm capacitation, a process which induces major changes in the sperm plasma membrane in…”
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Morphological evolution and dynamics of a large, sand braid-bar, Jamuna River, Bangladesh by Ashworth, Philip J., Best, James L., Roden, Julie E., Bristow, Charles S., Klaassen, Gerrit J.

“…The initiation and evolution of a kilometre‐scale, sand braid‐bar was monitored during a 28‐month survey period from 1993 to 1996 in one of the world’s largest…”
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MID-CHANNEL BAR GROWTH AND ITS RELATIONSHIP TO LOCAL FLOW STRENGTH AND DIRECTION by ASHWORTH, PHILIP J.

“…Anabranches of braided rivers typically migrate and avulse across the floodplain to produce new channel junctions, scour and subsequent mid‐channel bar growth…”
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The physical scale modelling of braided alluvial architecture and estimation of subsurface permeability by Moreton, D. J., Ashworth, P. J., Best, J. L.

“…ABSTRACT The quantitative modelling of fluvial reservoirs, especially in the stages of enhanced oil recovery, requires detailed three‐dimensional data at both…”
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Computational fluid dynamics and the physical modelling of an upland urban river by Ma, Lin, Ashworth, Philip J., Best, James L., Elliott, Lionel, Ingham, Derek B., Whitcombe, Leslie J.

“…This paper describes the application of a commercially available, three-dimensional computational fluid dynamic (CFD) model to simulate the flow structure in…”
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Hydrodynamic modelling of tidal-fluvial flows in a large river estuary by Sandbach, S.D., Nicholas, A.P., Ashworth, P.J., Best, J.L., Keevil, C.E., Parsons, D.R., Prokocki, E.W., Simpson, C.J.

“…The transition between riverine and estuarine environments is characterised by a change from unidirectional to bidirectional flows, in a region referred to…”
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The adaptation of dunes to changes in river flow by Reesink, A.J.H., Parsons, D.R., Ashworth, P.J., Best, J.L., Hardy, R.J., Murphy, B.J., McLelland, S.J., Unsworth, C.

“…The dunes that cover the beds of most alluvial channels change in size and shape over time and in space, which in turn affects the flow and sediment-transport…”
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