Results 181 to 190 of about 1,738,277 (218)

Predicting the migration rates of subaqueous dunes

Water Resources Research, 1996
In this paper we develop a simple, physically based method for predicting what fraction of sediment moving over the crests of dunes will bypass their lee faces. The bypass fraction is found by calculating a characteristic excursion length for every grain size making up a particular train of dunes.
David Mohrig, J. Dungan Smith
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A new expression describing the migration of aeolian dunes

CATENA, 2014
Based on quantitative simulations on the formation and evolution of aeolian dune fields, a semi-analytical equation describing the migration of aeolian sand dunes with respect to dune height, annual wind regime, frictional wind speed, and sand grain diameter is proposed in this paper through analyzing the migration speeds of aeolian sand dunes with ...
Tian-Li Bo, Xiao-Jing Zheng
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Sediment Particle Velocity and Activity During Dune Migration

Water Resources Research, 2021
AbstractThe processes underlying sediment transport mechanics are still debated. Here, we present novel ensemble particle bedload measurements, obtained with high‐frequency imaging of particle velocities and activity over various bedform migration stages.
Renske C. Terwisscha van Scheltinga, Giovanni Coco, Heide Friedrich   +2 more
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Migration of Parabolic Dunes at Aberffraw, Anglesey, North Wales

Geomorphology, 2004
Abstract Aberffraw is a 1-km-wide and 3-km-long transgressive dunefield that extends inland along a northeast–southwest-trending valley from a southwest-facing beach, Traeth Mawr. The prevailing wind is from the southwest, and both the parabolic dunes and the valley within which they lie are sub-parallel to the prevailing wind.
C S Bristow
exaly   +2 more sources

Algodones dune field of southeastern California: case history of a migrating modern dune field

Sedimentology, 1988
ABSTRACTThe Algodones dune field of southeastern California is one of the largest active dune fields in North America. The dune field is migrating in an easterly direction, oblique to the resultant sand flow direction (S 24° E). The migration of the Algodones results from an interaction between regional winds and the dune field.
M. L. SWEET, JAMIE NIELSON, K. HAVHOLM, JOHN FARRELLEY   +3 more
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The capturing of flocs by migrating subaqueous dunes

Flocculated particles, formed by the aggregation of clay particles, are common in rivers. These flocs exhibit a different behaviour than primary particles: they can deform and break apart, and they have greater settling velocities than the particles of which they are composed.
Sjoukje de Lange, Anne van der Wilk, Claire Chassagne, Waqas Ali, Ton Hoitink, Maximilian Borne, Kristian Brodersen, Kryss Waldschläger   +7 more
openaire   +1 more source

Dune migration in a steep, coarse‐bedded stream

Water Resources Research, 1989
During 1986 and 1987, migrating bed forms composed of coarse sand and fine gravel (d50=1.8 to 9.1 mm) were documented in the North Fork Toutle River at Kid Valley, Washington, at flow velocities ranging from 1.6 to 3.4 m s−1 and depths of 0.8 to 2.2 m.
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Is climate change affecting rates of dune migration in Antarctica?

Geology, 2011
Antarctica is the coldest, driest, and windiest continent on Earth, and contains sand dunes, like deserts elsewhere. The structure and age of the cold climate dunes found in the Victoria Valley, Antarctica, are described in the light of changing climate in the Ross Sea region of Antarctica during the late Holocene.
Bristow, Charlie S., Augustinus, Paul, Rhodes, Ed J., Wallis, Irene C., Jol, Harry M.   +4 more
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On the Migration of Tidal Dunes (Sand Waves)

2016
A morphological model to predict the formation of tidal dunes (sand waves) and their migration is described. The analysis assumes that the appearance of the bedforms is due to the growth of the most unstable component of an initially random perturbation of small amplitude, forced by a uniform tidal flow. Results are presented for a unidirectional tide,
VITTORI, GIOVANNA, BLONDEAUX, PAOLO
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Lateral migration of linear dunes in the Strzelecki desert, Australia

Earth Surface Processes and Landforms, 1990
AbstractLinear dunes in the Strzelecki Desert trend roughly south‐north. Sand transport, which is toward the NNE, has caused the dunes to migrate eastward while they extend or migrate northward. Eastward lateral migration is evidenced by: (1) asymmetrical shape of the dunes; east‐facing slopes are several times as steep as west‐facing slopes; (2 ...
openaire   +1 more source