Nabkha (coppice dune) fields of south-central New Mexico, U.S.A.

Langford, Richard P.

doi:10.1006/jare.2000.0650

Cited by 80 publications

(63 citation statements)

References 19 publications

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“…Nebkhas vary in shape and size [24], however those studied in Médanos Grandes were homogenous with their [20] in nebkhas of Burkina Faso. On the other hand, data show uniformity in the morphometry of all nebkhas.…”

Section: Nebkha-shrub Relationshipmentioning

confidence: 83%

“…This allows high rates of horizontal aeolian transport in nebkhas that may be part of a positive feedback in which increased aeolian transport leads to increased sediment transport from interspaces to nebkhas ( [19] [24]), and the arid zone of Argentina ( [25]- [28]), as common geomorphological-biological components of psammophilous environments. They have been indicated on crests of linear semi-fixed dunes [29] and in inter-dune valleys [30].…”

Section: Introductionmentioning

confidence: 99%

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Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina

Pastrán¹,

Carretero²

2016

JGIS

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Nebkhas, developed by the trapping of sand within the body of a plant, were studied in the Méda-nos Grandes system, arid central Argentina, during the springs of 2009-2010. The dynamics of nebkhas was studied in three draas (megadunes), and considering both orientations: leeward and windward. The Drift Potential (DP) for the study area was 42, evidencing the inactivity of the sand dunes or the scarce activity only in crests. Dominant sand movement is in south-southeast direction, with deflation processes at the southern side of the nebkhas. All nebkhas showed uniformity in the morphometry. Tricomaria usillo is the dominant plant species in the nebkha formation process; and results showed a significant positive relationship between nebkha and canopy volumes.

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Section: Nebkha-shrub Relationshipmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina

Pastrán¹,

Carretero²

2016

JGIS

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“…Even in settings characterized by airflows that are undersaturated with respect to their potential sediment carrying capacity, nebkhas are able to grow, as long as the surface of the dune remains colonized by vegetation (Mountney & Russell 2006). In particular, the effectiveness of various species of Larrea and Prosopis as an agent to reduce near surface wind velocity is crucial to the sand trapping and their root mats are essential to the sand stabilization that enables long-term nebkha growth (Tengberg & Chen 1998;Langford 2000). The preferential development of larger nebkhas within the dry channel results exclusively from the localized disruption of airflow induced by vegetation (Mountney & Russell 2006) because wind contraction and acceleration are intensified as the airflow is funneled between channel banks (Mountney & Russell 2004).…”

Section: Discussionmentioning

confidence: 99%

Intermontane eolian sand sheet development, Upper Tulum Valley, central-western Argentina

Bó

Basílici

2015

Braz. J. Geol.

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ABSTRACT:The intermontane Upper Tulum eolian sand sheet covers an area of ca. 125 km² at north of the San Juan Province, central-western Argentina. The sand sheet is currently an aggrading system where vegetation cover, surface cementation and periodic flooding withhold the development of dunes with slipfaces. The sand sheet surface is divided into three parts according to the distribution of sedimentary features, which reflects the variation in sediment budget, water table level and periodic flooding. The central sand sheet part is the main area of eolian deposition and is largely stabilized by vegetation. The sedimentary succession is 4 m thick and records the vertical interbedding of eolian and subaqueous deposits, which have been deposited for at least 3.6 ky with sedimentation rates of 86.1 cm/ky. The construction of the sand sheet is associated with deflation of the sand-graded debris sourced by San Juan alluvial fan, which is available mainly in drier fall-winter months where water table is lower and wind speeds are periodically above the threshold velocity for sand transport. The accumulation of sedimentary bodies occurs in a stabilized eolian system where vegetation cover, thin mud veneers and surface cementation are the main agents in promoting accumulation. The preservation of the sand sheet accumulations is enabled by the progressive creation of the accommodation space in a tectonically active basin and the continuous burial of geological bodies favored by high rates of sedimentation.

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“…These sources included georegistered surface geology and soils maps (plus the descriptive layers associated with the original base polygon datasets), satellite imagery, information in published literature (e.g. Hawley et al, 1969;Langford, 2000;Castiglia and Fawcett, 2006;Hall et al, 2010), expert knowledge and dedicated verification field sorties. Digital Elevation Models and simple contour maps were used to differentiate high and low relief terrain.…”

Section: Methodsmentioning

confidence: 99%

Geomorphology of the Chihuahuan Desert based on potential dust emissions

et al. 2011

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The Chihuahuan Desert of central northern Mexico and southern Arizona, New Mexico and Texas, USA, is a regionally significant dust 'hot-spot' in North America. Typical of other such hot-spots, this desert consists of a mosaic of geomorphological settings, each of which has a varying propensity for dust emission. Recently, a classification system of dust emission potential based on surface geomorphic characteristics that establishes a common framework for describing the land surface has been proposed. The classification is readily applicable to different dust source regions and designed to facilitate comparison of the relative potential dust contributions and emissivity of varying geomorphological environments in such regions.The map here (1:3,500,000) was compiled by applying the new classification to a base map of polygons from existing soil and landform maps that were produced by national government agencies. Within the study area, 11 of the 17 possible geomorphic classes were present, the most extensive being unarmoured, unincised high relief alluvial surfaces, which covered 43% of the area.As an example of how empirical dust source point data can be used with the classification, the satelliteobserved origins of dust plumes for 26 major wind erosion events from 2001 to 2009 were overlain on the map. Despite a total area of only 4%, ephemeral lakes were the source of 48% of the observed plumes. This map and the relationships derived from it provide the basis for developing equivalent maps in other dusty regions, and mark a step toward improving the representation and documentation of the strength of dust sources in numerical mineral aerosol models.

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Nabkha (coppice dune) fields of south-central New Mexico, U.S.A.

Cited by 80 publications

References 19 publications

Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina

Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina

Intermontane eolian sand sheet development, Upper Tulum Valley, central-western Argentina

Geomorphology of the Chihuahuan Desert based on potential dust emissions

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Nabkha (coppice dune) fields of south-central New Mexico, U.S.A.

Cited by 80 publications

References 19 publications

Phytogenic Mounds (Nebkhas): Effect of &lt;i&gt;Tricomaria usillo&lt;/i&gt; on Sand Entrapment in Central-West of Argentina

Phytogenic Mounds (Nebkhas): Effect of &lt;i&gt;Tricomaria usillo&lt;/i&gt; on Sand Entrapment in Central-West of Argentina

Intermontane eolian sand sheet development, Upper Tulum Valley, central-western Argentina

Geomorphology of the Chihuahuan Desert based on potential dust emissions

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Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina

Phytogenic Mounds (Nebkhas): Effect of <i>Tricomaria usillo</i> on Sand Entrapment in Central-West of Argentina