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Title: Nebkha development and sediment supply
Authors: Hesp, Patrick A.
Hernández Calvento, Luis Francisco 
Hernández Cordero, Antonio Ignacio 
Gallego-Fernández, Juan B.
García Romero, Leví Aday 
Miot da Silva, Graziela
Ruz, Marie Helene
UNESCO Clasification: 250618 Sedimentología
2506 Geología
Keywords: Canary Islands
Coastal Dunes
Nw African Coast, et al
Issue Date: 2021
Project: Análisis Del Impacto de Las Inundaciones en Áreas Turísticas Costeras: Canarias, Laboratorio Natural de Resilencia 
Journal: Science of the Total Environment 
Abstract: This study examines the role of sediment supply in controlling the formation and the spatial patterns of nebkha, numbers and sizes, present in foredunes fronting coastal dunefields of the arid northwest African and the Canary Islands coasts. Sediment supply is estimated qualitatively and quantitatively by various measures, and the number and size of nebkhas are obtained on a range of beach-dune systems. In the case of the Canary Islands, LiDAR data and orthophotos with high spatial resolution (0.25 m) are used to measure sediment supply/activity, nebkha numbers and sizes, and vegetation variables, whereas data availability is less on the African coast. Results show that sediment supply exerts a major control on nebkha development such that as sediment supply increases, the number of coastal nebkha decreases, and the size of individual plants/nebkha increases. Once sediment supply is large, nebkha can only form on the immediate backshore if space is available, and a point is reached when the sediment supply is so large that nebkha do not, or cannot form. The data presented here provide two indicators which could be applicable to other dune systems. Firstly, by estimating the number of nebkha and the vegetation cover, the degree of aeolian sedimentary activity or sediment supply might be estimated. Secondly, the type of aeolian landform present provides a qualitative indication of sediment supply and aeolian activity.
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2020.144815
Source: Science of the Total Environment [ISSN 0048-9697], v. 773, (Junio 2021)
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