Relevant bibliographies by topics / Formation de dunes

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Academic literature on the topic 'Formation de dunes'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Formation de dunes"

1

Tsoar, H. "Linear dunes - forms and formation." Progress in Physical Geography: Earth and Environment 13, no. 4 (1989): 507–28. http://dx.doi.org/10.1177/030913338901300402.

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Most geomorphologists and geologists do not differentiate the various types of linear dune and refer to them as one dune type mainly in the terms of linear, longitudinal or seif dunes. In recent morphodynamic and genetic classifications of dunes, all types of linear dunes are lumped under the heading of longitudinal dunes (Wasson and Hyde, 1983; Hunter et al., 1983). This review, however, substantiates three different simple linear dunes - lee dunes, seifs and vegetated- linear - each of which has a different shape and mechanism of formation and elongation.
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2

LEE, JAE HWAN, A. O. SOUSA, E. J. R. PARTELI, and H. J. HERRMANN. "MODELLING FORMATION AND EVOLUTION OF TRANSVERSE DUNE FIELDS." International Journal of Modern Physics C 16, no. 12 (2005): 1879–92. http://dx.doi.org/10.1142/s0129183105008400.

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We model formation and evolution of transverse dune fields. In the model, only the cross section of the dune is simulated. The only physical variable of relevance is the dune height, from which the dune width and velocity are determined, as well as phenomenological rules for interaction between two dunes of different heights. We find that dune fields with no sand on the ground between dunes are unstable, i.e., small dunes leave the higher ones behind. We then introduce a saturation length to simulate transverse dunes on a sand bed and show that this leads to stable dune fields with regular spacing and dune heights. Finally, we show that our model can be used to simulate coastal dune fields if a constant sand influx is considered, where the dune height increases with the distance from the beach, reaching a constant value.
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3

COLOMBINI, M., and A. STOCCHINO. "Ripple and dune formation in rivers." Journal of Fluid Mechanics 673 (March 2, 2011): 121–31. http://dx.doi.org/10.1017/s0022112011000048.

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A linear stability analysis for dune and ripple formation is presented that implements a rotational two-dimensional flow model valid in the smooth as well as in the transitional and rough flow regimes. Sediment is assumed to be transported as bedload, disregarding the role of suspension. Therefore, the main mechanism driving instability, for both ripples and dunes, is the phase lag between bed shear stress and bed elevation. Ripples are shown to be confined to relatively low values of the Shields parameter and of the particle Reynolds number. For higher values of the Shields parameter and of the particle Reynolds number (and thus of the Froude number and of the roughness Reynolds number), ripples are replaced by dunes. The present analysis ultimately allows for a successful unification of the theories of dune and ripple formation and for a clarification of the debated role of ripples on the formation of dunes. A good agreement between predicted and observed wavelengths for both ripples and dunes is found.
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4

Davis, John H. "DUNE FORMATION AND STABILIZATION BY VEGETATION AND PLANTINGS." Coastal Engineering Proceedings 1, no. 6 (2011): 29. http://dx.doi.org/10.9753/icce.v6.29.

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Plantings of appropriate native and introduced plants and the management of extant vegetation are often very effective in promoting the development and maintenance of dunes that serve to protect shores against some types of erosion. The importance of dunes as barriers, the formation of dunes, and the role of plants and vegetation are considered. The types of vegetation of the three zones usually present over dune fields are described, and the general management to maintain such vegetation is discussed. Methods of making plantings on natural and artificial dunes by selecting, seeding, and transplanting the species that are most effective in building and stabilizing dunes are given.
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5

Nishimori, Hiraku, Masato Yamasaki, and Ken Haste Andersen. "A Simple Model for the Various Pattern Dynamics of Dunes." International Journal of Modern Physics B 12, no. 03 (1998): 257–72. http://dx.doi.org/10.1142/s021797929800020x.

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A simple computational model is proposed that reproduces various aspects of the complex dynamics of dunes such as the barchan dunes formation process, the evolution process from a barchan dune to a seif dune, the network-dunes formation under time-dependent directional winds, etc. Although this model may be oversimplified in several respects, there is a hope that it helps us to sift relevant factors out the vast sea of numerous factors influencing the rich dynamics of desert dunes.
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6

Alvarez, Carlos A., and Erick Franklin. "Experimental study on the formation of subaqueous barchan dunes in closed conduits." EPJ Web of Conferences 180 (2018): 02002. http://dx.doi.org/10.1051/epjconf/201818002002.

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The present paper reports the formation of subaqueous barchan dunes by analyzing the temporal evolution of their main geometrical characteristics (width W, length L and horn lengths Lh). After certain time, the dunes reach an equilibrium state and it is possible to study the relation between W versus L, and the dependence of the dune velocity on L. The barchan dunes were formed from spherical glass and zirconium beads. An initial conical heap of beads was placed on the bottom wall of a rectangular channel and it was entrained by a water turbulent flow. The evolution of the dunes was filmed with a CCD camera placed above the channel and mounted on a traveling system. Our results show that after a characteristic time the dune shape does not change and it travels with a roughly constant velocity. Once the equilibrium state is reach, W and L are measured, showing linear dependence. Furthermore, we show that the dune velocity Vd scales with the inverse of the dune length.
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7

Liu, Zhengyao, Zhibao Dong, and Xujia Cui. "Morphometry of lunette dunes in the Tirari Desert, South Australia." Open Geosciences 10, no. 1 (2018): 452–60. http://dx.doi.org/10.1515/geo-2018-0035.

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Abstract Morphometry and formation processes are key research problems in the study of aeolian sandy landforms. Based on morphometric parameters inferred from satellite images and the calculation of the drift potential (DP), we examined general characteristics of lunette dunes in the Tirari Desert, South Australia, along with their morphometry and formation processes to determine how this landform type initially formed and its relationship to surrounding linear dune distribution. Results show that the morphometric parameters of lunette dunes and connective lake systems exhibit moderate correlations. It suggests that the morphology of these dunes is controlled by the lakes. Spatially, the lunette dunes present regular arrangement, and the strike of their alignment are approximately in accordance with the linear dunes. The calculated DP implies that the lunette dunes developed under a low-wind-energy environment, which is a wind regime similar to that required for the formation of the surrounding linear dunes. Even though, the resultant DP demonstrates that the summer wind should be responsible for the growth of the lunette dunes. However, accompanied with the repeated drying of lakes and even its disappearance during the dune development process, it not only contributes to the development of lunette dunes but also promotes their transformation to linear dunes.
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8

Lancaster, Nicholas, and Shannon A. Mahan. "Holocene dune formation at Ash Meadows National Wildlife Area, Nevada, USA." Quaternary Research 78, no. 2 (2012): 266–74. http://dx.doi.org/10.1016/j.yqres.2012.05.012.

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AbstractSmall isolated dune fields in the northern Mojave Desert are important centers of biodiversity and archaeological occupation sites. Currently dunes at Ash Meadows, Nevada, are stabilized by vegetation and are experiencing erosion of their upwind margins, indicating a negative sediment budget. New OSL ages from dunes at Ash Meadows indicate continuous eolian accumulation from 1.5 to 0.8 ka, with further accumulation around 0.2 ka. Prior studies (e.g., Mehringer and Warren, 1976) indicate periods of dune accumulation prior to 3.3 ka; 1.9–1 ka; and after 0.9 ka. These periods of eolian accumulation are largely synchronous with those identified elsewhere in the Mojave Desert. The composition of the Ash Meadows dunes indicates their derivation from regional fluvial sources, most likely during periods when axial washes were active as a result of enhanced winter precipitation.
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9

Rabi, HASSANE GANDA, HAMIDOU Haoua, and SALEY Bisso. "Modeling and Numerical Simulation of Sand Dunes Formation." Journal of Mathematics Research 9, no. 4 (2017): 78. http://dx.doi.org/10.5539/jmr.v9n4p78.

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We are interested this paper in the modeling and numerical simulation of sand dune formation (on the effect of wind). We propose a simple model which will be approached by a classical numerical method in order to verify validity of our model to describe the phenomena of dune formation. Some numerical solutions of dune evolution and approximation error table are presented to verify that the simplified model is adopted to study the formation of sand dunes.
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10

Clemmensen, Lars B. "Aeolian morpho_logy preserved by lava cover, the Precambrian Mussartut Member, Eriksfjord Formation, South Greenland." Bulletin of the Geological Society of Denmark 37 (October 14, 1988): 105–16. http://dx.doi.org/10.37570/bgsd-1988-37-09.

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Investigations of sedimentary deposits in elastic interval 5 of the Mussartilt Member have revealed the occurrence of aeolian sandstones. The aeolian deposits rest on pebbly sandstones and conglomerates of fluvial origin, and the are sharply overlain by a c. 70 m thick lava flow. The aeolian sandstones comprise up to 10 m thick and 200 m wide dome-shaped bodies that are initiated by thin and patchily preserved aeolian sand sheet deposits. The bulk of the aeolian sandstone bodies constitute low-medium-angle, dipping lee-side deposits of dome-shaped dunes. The dome-shaped dunes migrated towards a zone of distal alluvial fans perhaps during the influence of prevailing NE trade winds. Superimposed smaller-scale dunes formed during periodic strong winds from the E. Erosion of the dunes at the base of the lava flow was insignificant and most of the original dome-shape form of the dunes seems to have been preserved. The dome-shaped dunes may represent part of a migrating erg system, but continued dune migration was stopped by extrusion of the lava flow.
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