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All Outputs (119)

Influence of junction angle on three-dimensional flow structure and bed morphology at confluent meander bends during different hydrological conditions (2014)
Journal Article
Riley, J. D., Rhoads, B. L., Parsons, D. R., & Johnson, K. K. (2015). Influence of junction angle on three-dimensional flow structure and bed morphology at confluent meander bends during different hydrological conditions. Earth surface processes and landforms : the journal of the British Geomorphological Research Group, 40(2), 252-271. https://doi.org/10.1002/esp.3624

© 2014 John Wiley & Sons, Ltd. Recent field and modeling investigations have examined the fluvial dynamics of confluent meander bends where a straight tributary channel enters a meandering river at the apex of a bend with a 90° junction angle. Past... Read More about Influence of junction angle on three-dimensional flow structure and bed morphology at confluent meander bends during different hydrological conditions.

The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina (2014)
Journal Article
Blettler, M. C. M., Amsler, M. L., Ezcurra de Drago, I., Espinola, L. A., Eberle, E., Paira, A., Best, J. L., Parsons, D. R., & Drago, E. E. (2015). The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina. Ecohydrology, 8(2), 340-352. https://doi.org/10.1002/eco.1511

This study examines the morphological features, suspended sediment inputs and hydraulic conditions within a large river in association with ecological patterns before and after a tributary confluence. In order to examine these effects, the macroinver... Read More about The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina.

The critical role of stratification in submarine channels: Implications for channelization and long runout of flows (2014)
Journal Article
Dorrell, R. M., Darby, S. E., Peakall, J., Sumner, E. J., Parsons, D. R., & Wynn, R. B. (2014). The critical role of stratification in submarine channels: Implications for channelization and long runout of flows. Journal of Geophysical Research: Oceans, 119(4), 2620-2641. https://doi.org/10.1002/2014jc009807

Channelized submarine gravity currents travel remarkable distances, transporting sediment to the distal reaches of submarine fans. However, the mechanisms by which flows can be sustained over these distances remain enigmatic. In this paper we conside... Read More about The critical role of stratification in submarine channels: Implications for channelization and long runout of flows.

Autonomous Underwater Vehicles (AUVs): Their past, present and future contributions to the advancement of marine geoscience (2014)
Journal Article
Wynn, R. B., Huvenne, V. A., Le Bas, T. P., Murton, B. J., Connelly, D. P., Bett, B. J., Ruhl, H. A., Morris, K. J., Peakall, J., Parsons, D. R., Sumner, E. J., Darby, S. E., Dorrell, R. M., & Hunt, J. E. (2014). Autonomous Underwater Vehicles (AUVs): Their past, present and future contributions to the advancement of marine geoscience. Marine Geology, 352, 451-468. https://doi.org/10.1016/j.margeo.2014.03.012

Autonomous Underwater Vehicles (AUVs) have a wide range of applications in marine geoscience, and are increasingly being used in the scientific, military, commercial, and policy sectors. Their ability to operate autonomously of a host vessel makes th... Read More about Autonomous Underwater Vehicles (AUVs): Their past, present and future contributions to the advancement of marine geoscience.

Scales and causes of heterogeneity in bars in a large multi-channel river: Río Paraná, Argentina (2014)
Journal Article
Reesink, A. J. H., Ashworth, P. J., Sambrook Smith, G. H., Best, J. L., Parsons, D. R., Amsler, M. L., Hardy, R. J., Lane, S. N., Nicholas, A. P., Orfeo, O., Sandbach, S. D., Simpson, C. J., & Szupiany, R. N. (2014). Scales and causes of heterogeneity in bars in a large multi-channel river: Río Paraná, Argentina. Sedimentology, 61(4), 1055-1085. https://doi.org/10.1111/sed.12092

To date, published studies of alluvial bar architecture in large rivers have been restricted mostly to case studies of individual bars and single locations. Relatively little is known about how the depositional processes and sedimentary architecture... Read More about Scales and causes of heterogeneity in bars in a large multi-channel river: Río Paraná, Argentina.

Near-bed and surface flow division patterns in experimental river bifurcations (2014)
Journal Article
Marra, W. A., Parsons, D. R., Kleinhans, M. G., Keevil, G. M., & Thomas, R. E. (2014). Near-bed and surface flow division patterns in experimental river bifurcations. Water Resources Research, 50(2), 1506-1530. https://doi.org/10.1002/2013WR014215

Understanding channel bifurcation mechanics is of great importance for predicting and managing multichannel river processes and avulsion in distributary river deltas. To date, research on river channel bifurcations has focused on factors determining... Read More about Near-bed and surface flow division patterns in experimental river bifurcations.

Driven around the bend: spatial evolution and controls on the orientation of helical bend flow in a natural submarine gravity current (2014)
Journal Article
Sumner, E. J., Peakall, J., Dorrell, R. M., Parsons, D. R., Darby, S. E., Wynn, R. B., McPhail, S. D., Perrett, J., Webb, A., & White, D. (2014). Driven around the bend: spatial evolution and controls on the orientation of helical bend flow in a natural submarine gravity current. Journal of Geophysical Research: Oceans, 119(2), 898-913. https://doi.org/10.1002/2013jc009008

Submarine channel systems transport vast amounts of terrestrial sediment into the deep sea. Understanding the dynamics of the gravity currents that create these systems, and in particular, how these flows interact with and form bends, is fundamental... Read More about Driven around the bend: spatial evolution and controls on the orientation of helical bend flow in a natural submarine gravity current.

First direct measurements of hydraulic jumps in an active submarine density current (2013)
Journal Article
Sumner, E. J., Peakall, J., Parsons, D. R., Wynn, R. B., Darby, S. E., Dorrell, R. M., McPhail, S. D., Perrett, J., Webb, A., & White, D. (2013). First direct measurements of hydraulic jumps in an active submarine density current. Geophysical research letters, 40(22), 5904-5908. https://doi.org/10.1002/2013gl057862

For almost half a century, it has been suspected that hydraulic jumps, which consist of a sudden decrease in downstream velocity and increase in flow thickness, are an important feature of submarine density currents such as turbidity currents and deb... Read More about First direct measurements of hydraulic jumps in an active submarine density current.

The influence of earth surface movements and human activities on the river Karun in lowland south-west Iran (2013)
Thesis
Woodbridge, K. P. (2013). The influence of earth surface movements and human activities on the river Karun in lowland south-west Iran. (Thesis). University of Hull. Retrieved from https://hull-repository.worktribe.com/output/4215645

Earth surface movements are a primary external control on river system dynamics and evolution. It has often been observed that when responding to Earth surface motion driven by surface expression of folds, major rivers incise across young, active fol... Read More about The influence of earth surface movements and human activities on the river Karun in lowland south-west Iran.

Superelevation and overspill control secondary flow dynamics in submarine channels (2013)
Journal Article
Dorrell, R. M., Darby, S. E., Peakall, J., Sumner, E. J., Parsons, D. R., & Wynn, R. B. (2013). Superelevation and overspill control secondary flow dynamics in submarine channels. Journal of Geophysical Research: Oceans, 118(8), 3895-3915. https://doi.org/10.1002/jgrc.20277

In subaerial and submarine meander bends, fluid flow travels downstream in a helical spiral, the structure of which is determined by centrifugal, hydrostatic, baroclinic, and Coriolis forces that together balance frictional stresses generated by the... Read More about Superelevation and overspill control secondary flow dynamics in submarine channels.

Monitoring the generation and evolution of the sediment plume behind towed fishing gears using a multibeam echosounder (2013)
Journal Article
O'Neill, F. G., Simmons, S. M., Parsons, D. R., Best, J. L., Copland, P. J., Armstrong, F., Breen, M., & Summerbell, K. (2013). Monitoring the generation and evolution of the sediment plume behind towed fishing gears using a multibeam echosounder. ICES journal of marine science : journal du conseil, 70(4), 892-903. https://doi.org/10.1093/icesjms/fst051

O'Neill, F. G., Simmons, S. M., Parsons, D. R., Best, J. L., Copland, P. J., Armstrong, F., Breen, M., and Summerbell, K. 2013. Monitoring the generation and evolution of the sediment plume behind towed fishing gears using a multibeam echosounder. -... Read More about Monitoring the generation and evolution of the sediment plume behind towed fishing gears using a multibeam echosounder.

Flow separation at the inner (convex) and outer (concave) banks of constant-width and widening open-channel bends (2012)
Journal Article
Blanckaert, K., Kleinhans, M. G., Mclelland, S. J., Uijttewaal, W. S., Murphy, B., van de Kruijs, A., Parsons, D. R., & Chen, Q. (2013). Flow separation at the inner (convex) and outer (concave) banks of constant-width and widening open-channel bends. Earth surface processes and landforms : the journal of the British Geomorphological Research Group, 38(7), 696-716. https://doi.org/10.1002/esp.3324

There is a paucity of data and insight in the mechanisms of, and controls on flow separation and recirculation at natural sharply-curved river bends. Herein we report on successful laboratory experiments that elucidate flow structure in one constant-... Read More about Flow separation at the inner (convex) and outer (concave) banks of constant-width and widening open-channel bends.

Gravity-driven flow in a submarine channel bend: Direct field evidence of helical flow reversal (2010)
Journal Article
Parsons, D. R., Peakall, J., Aksu, A. E., Flood, R. D., Hiscott, R. N., Beşiktepe, Ş., & Mouland, D. (2010). Gravity-driven flow in a submarine channel bend: Direct field evidence of helical flow reversal. Geology, 38(12), 1063-1066. https://doi.org/10.1130/G31121.1

Submarine meandering channels are conduits that transport gravity-driven flows and sediments into the deep sea. Such channel systems form distributive networks across submarine fans, ultimately forming the largest sedimentary deposits on Earth. Despi... Read More about Gravity-driven flow in a submarine channel bend: Direct field evidence of helical flow reversal.

Response of river-dominated delta channel networks to permanent changes in river discharge (2010)
Journal Article
Edmonds, D., Slingerland, R., Best, J., Parsons, D., & Smith, N. (2010). Response of river-dominated delta channel networks to permanent changes in river discharge. Geophysical research letters, 37(12), 1-5. https://doi.org/10.1029/2010GL043269

Using numerical experiments, we investigate how river-dominated delta channel networks are likely to respond to changes in river discharge predicted to occur over the next century as a result of environmental change. Our results show for a change in... Read More about Response of river-dominated delta channel networks to permanent changes in river discharge.

A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES) (2010)
Journal Article
Best, J., Simmons, S., Parsons, D., Oberg, K., Czuba, J., & Malzone, C. (2010). A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES). Geophysical research letters, 37(6), Article ARTN L06405. https://doi.org/10.1029/2009gl041852

In order to investigate the interactions between turbulence and suspended sediment transport in natural aqueous environments, we ideally require a technique that allows simultaneous measurement of fluid velocity and sediment concentration for the who... Read More about A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES).

Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina (2008)
Journal Article
Lane, S. N., Parsons, D. R., Best, J. L., Orfeo, O., Kostaschuk, R. A., & Hardy, R. J. (2008). Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina. Journal of Geophysical Research: Earth Surface, 113(F2), 0 - 0. https://doi.org/10.1029/2006jf000745

Airborne and satellite observations show that when large rivers join they can take hundreds of kilometers to mix completely but, on occasion, may mix very rapidly. Application of established semitheoretical analyses shows that long mixing lengths sho... Read More about Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina.

The theoretical foundations and potential for large-eddy simulation (LES) in fluvial geomorphic and sedimentological research (2004)
Journal Article
Keylock, C., Hardy, R., Parsons, D., Ferguson, R., Lane, S., & Richards, K. (2005). The theoretical foundations and potential for large-eddy simulation (LES) in fluvial geomorphic and sedimentological research. Earth-Science Reviews, 71(3-4), 271-304. https://doi.org/10.1016/j.earscirev.2005.03.001

Large-eddy simulation (LES) is a method for resolving the time-dependent structure of high Reynolds number, turbulent flows. With LES it is possible to model and track the behaviour of coherent turbulent structures and study their effect on the flow... Read More about The theoretical foundations and potential for large-eddy simulation (LES) in fluvial geomorphic and sedimentological research.

I'll be dead by the time it happens: Children's Perceptions of Climate Change in the Mekong Delta, Vietnam
Presentation / Conference Contribution
Halstead, F., Parsons, D., Jones, L., & Hackney, C. (2020, May). I'll be dead by the time it happens: Children's Perceptions of Climate Change in the Mekong Delta, Vietnam. Paper presented at EGU General Assembly 2020 (European Geosciences Union), Sharing Geoscience Online

The Mekong Delta in Southern Vietnam is one of the most at risk places globally to the effects of climate change and sea level rise, specifically in terms of flooding. It is predicted to change drastically over the next 100 years, with additional hum... Read More about I'll be dead by the time it happens: Children's Perceptions of Climate Change in the Mekong Delta, Vietnam.