Downwind effects on an arid dunefield from an evolving urbanised area

Hernández‐Calvento, Luis; Jackson, Derek W.T.; Medina, Raúl; Hernández‐Cordero, Antonio I.; Cruz, Nayara Barbosa da; Requejo, Soledad

doi:10.1016/j.aeolia.2014.06.007

Cited by 42 publications

(50 citation statements)

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“…Deflation areas have also increased through time, particularly within the acceleration zone (Figure ). The most significant increase is at the E edge of the dunefield [ Hernández‐Calvento et al ., ]. Hernández et al .…”

Section: Discussionsupporting

confidence: 66%

“…Hernández‐Calvento et al . [] conducted the first model to analyze the impact of urbanization on the regional airflow perturbations across a dunefield. Here, we build upon this original study by providing a coupled meso‐scale CFD model using detailed building geometries and actual dune topography.…”

Section: Discussionmentioning

confidence: 99%

“…These results correspond well with those presented by Hernández‐Calvento et al . [] who found a 15°–20° deflection of flow upwind of the terrace before flow shifted toward the S in downwind locations. The geomorphic significance of these perturbations is the modification of primary (i.e., stoss side flow) and secondary (i.e., lee‐side flow) at the dune length scale and the overall truncation of the sediment pathway through the system at the dunefield scale.…”

Section: Discussionmentioning

confidence: 99%

“…Hernández‐Calvento et al . [] provided the first study of its kind in implementing an urban airflow model in a geomorphological context. The authors simulated flow conditions around the Maspalomas dunefield, Gran Canaria (Spain) using a simplified numerical model based on a logarithmic wind profile to analyze perturbed flow velocity and directionality for pre‐ and post‐urbanization of an elevated paleo‐alluvial terrace that extends down through the central section of the dunefield.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the role of urbanization on airflow perturbations and dunefield evolution

et al. 2017

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Rapid urban development has been widespread in many arid regions of the world during the Anthropocene. Such development has the potential to affect, and be affected by, local and regional dunefield dynamics. While urban design often includes consideration of the wind regime, the potential impact of construction on the surrounding environment is seldom considered and remains poorly understood. In this study, regional airflow modeling during successive stages of urbanization at Maspalomas, Gran Canaria, Spain, indicates significant and progressive flow perturbations that have altered the adjacent dunefield. Significant modifications to the boundary layer velocity, mean wind directionality, turbulence intensity, and sediment flux potential are attributed to the extension of the evolving urban geometry into the internal boundary layer. Two distinct process/response zones were identified: (1) the urban shadow zone where widespread dune stabilization is attributed to the sheltering effect of the urban area on surface wind velocity; and (2) the acceleration zone where airflow is deflected away from the urbanized area, causing an increase in sediment transport potential and surface erosion. Consistent coherent turbulent structures were identified at landform and dunefield scales: counter-rotating vortices develop in the lee-side flow of dune crests and shedding off the buildings on the downwind edge of the urban area. This study illustrates the direct geomorphic impact of urbanization on aeolian dunefield dynamics, a relationship that has received little previous attention. The study provides a template for investigations of the potential impact of urbanization in arid zones.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantifying the role of urbanization on airflow perturbations and dunefield evolution

et al. 2017

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“…() (b); Domon & Bouchard () (c); Gimmi & Bürgi () (d); Bürgi & Gimmi () (e); Fogerty (2005) (f); Hernández‐Calvento et al . () (g); Alphan () (h); Rumsey & Williams () (i); and de Mûelenaere et al . () (j).…”

Section: Methodsmentioning

confidence: 99%

Long‐term Human Impacts on the Coast of La Graciosa, Canary Islands

et al. 2015

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The Global Change is affecting coastal areas and leading them to degradation. This is severe in sand dunes and sand plains, since they are very fragile ecosystems. The objective of this paper is to characterize the relationship between the historical land uses and the aeolian sedimentary dynamics in an arid coastal system, the island of La Graciosa (Canary Islands) since the second half of the 18th century. The methodology is based on the interpretation of historical documents, aerial photographs and oral testimonies to characterize the changes in the island, both in terms of land use and aeolian geomorphology. The results suggest the existence of six stages, during which the intensity of human pressure on the environment changed.

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