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Saturday, July 25, 2020 | History

2 edition of development and hydralulic roughness of subaqueous dunes found in the catalog.

development and hydralulic roughness of subaqueous dunes

Antoine Wilbers

development and hydralulic roughness of subaqueous dunes

by Antoine Wilbers

  • 211 Want to read
  • 10 Currently reading

Published by Royal Dutch Geographical Society in Utrecht .
Written in English

    Subjects:
  • Sedimentation and deposition -- Netherlands -- Rhine River.,
  • Sedimentation and deposition -- Netherlands -- Meuse River.,
  • Sediment transport -- Netherlands -- Rhine River.,
  • Sediment transport -- Netherlands -- Meuse River.

  • Edition Notes

    StatementAntoine Wilbers.
    SeriesNederlandse geografische studies = -- Netherlands geographical studies -- 323, Nederlandse geografische studies -- 323
    The Physical Object
    Pagination227 p. :
    Number of Pages227
    ID Numbers
    Open LibraryOL22604062M
    ISBN 109068093614

    A parameterization of flow separation over subaqueous dunes. By Andries J. Paarlberg, C. Marjolein Dohmen-Janssen, Flow separation plays a key role in the development of dunes, and modeling the complicated flow behavior inside the flow separation zone requires much computational effort. Hydraulic roughness of bedforms. 7) is a large subaqueous dune field; dunes have wave-lengths of 10 to m and heights of to 5 m (Kostaschuk et al., ; Currie and Mosher, ). 1), there is a series of nearly symmetrical, very large subaqueous dunes that have wavelengths between and m, covering an area of k[2] in to m of water (Figs.

    Ripples are distinguished from dunes by their much smaller scale. Indeed, ripples and dunes often co-exist, with ripples forming on the larger dunes. The rest of this chapter focusses on models to describe the formation and evolution of dunes. Dunes Dunes are perhaps best known as the sand dunes of wind-blown deserts. They occur. A. Wilbers, The Development and Hydraulic Roughness of Subaqueous Dunes, Netherlands Geographical Studies Vol. (Utrecht University, Utrecht, The Netherlands, ). Google Scholar; A. Kadota and I. Nezu, “ Three-dimensional structure of space-time correlation on coherent vortices generated behind dune crest,” J. Hydraul. : Subhasish Dey, Subhasish Dey, Prianka Paul, Ellora Padhi.

      A field study of turbulence and sediment dynamics over subaqueous dunes with flow separation. The influence of surface roughness, Journal of Geophysical Research: Earth Surface, Influence of hydraulic conditions over dunes on the distribution of the benthic macroinvertebrates in a large sand bed river, Water Cited by: Xin Gao, Clément Narteau and Olivier Rozier, Development and steady states of , Large-eddy simulation of turbulent open-channel flow over three-dimensional dunes, Journal of Hydraulic Research, Christian Winter and Alex Bartholom ä, Hydraulic roughness over simple subaqueous dunes, Geo -Marine Letters Cited by:


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Development and hydralulic roughness of subaqueous dunes by Antoine Wilbers Download PDF EPUB FB2

The propsed method for predicting dune-related hydraulic roughness uses the shape of the dunes in the form of the brinkpoint height, and the composition of the dune field in the form of the.

Ernstsen VB, Noormets R, Winter C, Hebbeln D, Bartholom ä A, Flemming BW, Bartholdy J () Development of subaqueous barchanoid-shaped dunes due to lateral grain size variability in a tidal inlet channel of the Danish Wadden Sea.

J Geophys Res Part F Earth Surface F04S doi: /JF CrossRef Google ScholarCited by: Hydraulic roughness over simple subaqueous dunes Article (PDF Available) in Geo-Marine Letters 30(1) February with Reads How we measure 'reads'.

Hydraulic roughness over simple subaqueous dunes. [1] Determining the hydraulic conditions whereby gravel dunes first develop in subaqueous environments is fundamental as their presence may influence engineering solutions designed to maintain bed stability.

In addition, estimates of the flow conditions associated with preserved gravel bed forms in sedimentary sequences are useful for reconstructing the depositional Cited by: Development of subaqueous barchanoid-shaped dunes due to lateral grain size variability in a tidal i.

The most common forms of bed roughness include ripples, dunes, a transition roughness as the dunes change to a plane or flat bed, plane bed, standing waves, and : Paul Carling.

Wilbers The development and hydraulic roughness of subaqueous dunes: Netherlands Geographical Studies The Royal Dutch Geographical Society, Utrecht, Netherlands,p. Based upon already-existing theories in the area of sediment bed-form initiation and development, 7 experimental runs were carried out in a mm-wide, glass-sided, 12m-long laboratory flume.

The development of these dunes is due to an increase in dune celerity from 12 m/yr in the center of the channel to around 30 m/yr at the sides.

This increase in dune celerity can be explained by the fact that dune heights decrease from m in the center of the channel to m at the sides, as a smaller sediment volume has to be moved per Cited by:   Flow transverse bedforms (ripples and dunes) are ubiquitous in rivers and coastal seas.

Local hydrodynamics and transport conditions depend on the size and geometry of these bedforms, as they constitute roughness elements at the bed.

Bedform influence on flow energy must be considered for the understanding of flow dynamics, and in the development and application of numerical by:   Hydraulic roughness over simple subaqueous dunes Hydraulic roughness over simple subaqueous dunes Bartholdy, Jesper; Flemming, Burg; Ernstsen, Verner; Winter, Christian; Bartholom ä, Alex Geo-Mar Lett () –76 DOI /s ORIGINAL Jesper Bartholdy & Burg W.

Flemming & Verner B. Ernstsen & Christian Winter & Alex. [1] Flow separation plays a key role in the development of dunes, and modeling the complicated flow behavior inside the flow separation zone requires much computational effort.

To make a first step toward modeling dune development at reasonable temporal and spatial scales, a parameterization of the shape of the flow separation zone over two‐dimensional dunes is proposed herein, in order to Cited by:   The Effect of Changes in the Lee Shape of Dunes on the Flow Field, Turbulence, and Hydraulic Roughness Report R (University of Utrecht, ).

Author: Julia Cisneros, Jim L. Best, Thaienne van Dijk, Renato Paes de Almeida, Mario Amsler, Justin A. Bold. Subaqueous Dunes. The model aims at giving better insight into the development of the hydraulic roughness, and hence the flooding risk, during river floods.

The good understanding thus obtained will allow the development of parameterized models for large spatial and temporal scales that can be used in operational model for flood early warning. In our experience, most simple dunes in the marine environment develop angles of repose, and there is thus no need to reduce the constant in equation (3).

Although the large to very large dunes (on the stoss‐side of which the simple dunes occur) will also contribute to the hydraulic roughness, their effect is considered to be relatively by:   Wilbers, A.

& Ten Brinke, W. The response of subaqueous dunes to floods in sand and gravel bed reaches of the Dutch Rhine. Sedimentol – Yalin, M. An expression for bed-load by: Fredsøe, “ On the development of dunes in erodible channels,” J.

Fluid Mech. 64, 1 Wilbers, The Development and Hydraulic Roughness of Subaqueous Dunes, Netherlands Geographical Studies Vol. (Utrecht University, Utrecht, The Netherlands, ).

coherent structures, 2,24 2. : Subhasish Dey, Subhasish Dey, Prianka Paul, Ellora Padhi. Venusian surface pressures measured by Venera 9 and 10 averaged about 90 bar (equivalent to ∼ m, or ∼10 m per 1 bar, in the terrestrial ocean) with measured wind speeds – m s −1 (Keldysh, ).Surface images from the Venera landers (9, 10, 13, 14) showed fine-grained material at some of the sites suggesting the presence of material potentially capable of being moved through Author: Lynn D.V.

Neakrase, Martina Klose, Timothy N. Titus. [1] Marine sand waves and river dunes are rhythmic patterns, formed at the interface between a sandy bed and turbulent flows, driven by tidal and river currents.

Their origin, development, and dynamics are far from being fully understood. To enhance the discussion on this topic we organized the international conference Marine Sand Wave and River Dune Dynamics (MARID) in April in Enschede Cited by:.

Books A - Z; Journals A - Z; Videos; Librarians; Browse Volumes & Issues. Geo-Marine Letters. Hydraulic roughness over simple subaqueous dunes. Jesper Bartholdy, Burg W. Flemming, Verner B. Ernstsen Springer for Research & Development Support.Bartholomä A, Hydraulic roughness over simple subaqueous dunes.

Geo-Marine Letters, 30(1): Becker M, Schrottke K, Bartholomä A, Ernstsen VB, Winter C and Hebbeln D () Formation and entrainment of fluid mud layers in troughs of subtidal dunes in an estuarine turbidity zone. Journal of Geophysical Research-Oceans, (4).

Van Rijn, L. (). The prediction of bed forms, alluvial roughness and sediment transport. Delft Hydraulics report S part III.

Wilbers, A. (). The development and hydraulic roughness of subaqueous dunes. PhD thesis, Netherlands Geographical Studies, Faculty of Geosciences, Utrecht University.

Allen, J. (a).