Vegetation Against Dune Mobility

Durán, Orencio; Herrmann, Hans J.

doi:10.1103/physrevlett.97.188001

Cited by 152 publications

(178 citation statements)

References 24 publications

Supporting

Mentioning

172

Contrasting

Order By: Relevance

“…For instance, barchans occur in areas with unidirectional wind and low sand availability. The influence of the geographical constrains and the external physical conditions [2][3][4], of the dune-dune interactions [5][6][7] and even of the emergence of vegetation covers [8] in the dynamics and morphology of single dunes were quite well-established with the help of dune models [1,8,9]. There are also a few studies of entire dune fields [10][11][12][13], but a simple theoretical understanding of the size selection process within dune fields has still not been achieved.…”

Section: Introductionmentioning

confidence: 99%

The dune size distribution and scaling relations of barchan dune fields

et al. 2008

Self Cite

View full text Add to dashboard Cite

Barchan dunes emerge as a collective phenomena involving the generation of thousands of them in so called barchan dune fields. By measuring the size and position of dunes in Moroccan barchan dune fields, we find that these dunes tend to distribute uniformly in space and follow an unique size distribution function. We introduce an analytical mean-field approach to show that this empirical size distribution emerges from the interplay of dune collisions and sand flux balance, the two simplest mechanisms for size selection. The analytical model also predicts a scaling relation between the fundamental macroscopic properties characterizing a dune field, namely the inter-dune spacing and the first and second moments of the dune size distribution.

show abstract

Section: Introductionmentioning

confidence: 99%

The dune size distribution and scaling relations of barchan dune fields

et al. 2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…We use a simplified version of the vegetation formulation presented in Moore et al (2016), which is itself a modification of earlier models (Durán and Moore, 2013;Duránt Vinent and Moore, 2015;Durán and Herrmann, 2006). We now present the simplified vegetation model and then discuss the physical interpretation for the two key sensitivity parameters.…”

Section: Eco-morphodynamic Modelmentioning

confidence: 99%

“…This model is based on the coastal dune model of Durán and Moore (2013), itself based on previous models used to study a variety of dunes (e.g., Parteli et al, 2009;Durán and Herrmann, 2006;Durán et al, 2010). We briefly summarize the model and the vegetation formulation below.…”

Section: Eco-morphodynamic Modelmentioning

confidence: 99%

Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

2017

View full text Add to dashboard Cite

Abstract. Coastal foredunes form along sandy, low-sloped coastlines and range in shape from continuous dune ridges to hummocky features, which are characterized by alongshore-variable dune crest elevations. Initially scattered dune-building plants and species that grow slowly in the lateral direction have been implicated as a cause of foredune "hummockiness". Our goal in this work is to explore how the initial configuration of vegetation and vegetation growth characteristics control the development of hummocky coastal dunes including the maximum hummockiness of a given dune field. We find that given sufficient time and absent external forcing, hummocky foredunes coalesce to form continuous dune ridges. Model results yield a predictive rule for the timescale of coalescing and the height of the coalesced dune that depends on initial plant dispersal and two parameters that control the lateral and vertical growth of vegetation, respectively. Our findings agree with previous observational and conceptual work -whether or not hummockiness will be maintained depends on the timescale of coalescing relative to the recurrence interval of high-water events that reset dune building in low areas between hummocks. Additionally, our model reproduces the observed tendency for foredunes to be hummocky along the southeast coast of the US where lateral vegetation growth rates are slower and thus coalescing times are likely longer.

show abstract

“…The erosion patterns simulated by Dupont et al's [52] model were qualitatively consistent with previous wind tunnel [59,78] and field [46,140] observations. Minimal dune models (e.g., [168,169]), which combine analytical descriptions of turbulent wind velocity with continuum saltation models, have also been used to successfully simulate transitions between barchan and parabolic dunes [169,170].…”

Section: Computational Fluid Dynamics (Cfd) Modellingmentioning

confidence: 99%

Vegetation in Drylands: Effects on Wind Flow and Aeolian Sediment Transport

Mayaud

Webb

2017

Land

View full text Add to dashboard Cite

Drylands are characterised by patchy vegetation, erodible surfaces and erosive aeolian processes. Empirical and modelling studies have shown that vegetation elements provide drag on the overlying airflow, thus affecting wind velocity profiles and altering erosive dynamics on desert surfaces. However, these dynamics are significantly complicated by a variety of factors, including turbulence, and vegetation porosity and pliability effects. This has resulted in some uncertainty about the effect of vegetation on sediment transport in drylands. Here, we review recent progress in our understanding of the effects of dryland vegetation on wind flow and aeolian sediment transport processes. In particular, wind transport models have played a key role in simplifying aeolian processes in partly vegetated landscapes, but a number of key uncertainties and challenges remain. We identify potential future avenues for research that would help to elucidate the roles of vegetation distribution, geometry and scale in shaping the entrainment, transport and redistribution of wind-blown material at multiple scales. Gaps in our collective knowledge must be addressed through a combination of rigorous field, wind tunnel and modelling experiments.

show abstract

Vegetation Against Dune Mobility

Cited by 152 publications

References 24 publications

The dune size distribution and scaling relations of barchan dune fields

The dune size distribution and scaling relations of barchan dune fields

Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

Vegetation in Drylands: Effects on Wind Flow and Aeolian Sediment Transport

Contact Info

Product

Resources

About