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Airflow Dynamics and Aeolian Sand Transport Across a Beach‐Climbing Dune‐Clifftop Dune System

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dc.abstract.enThis study presents an analysis of wind flow and sediment transport from the beach up a 50 m high, long (130 m), steep (mean slope 26°) climbing dune and across a 1.5 m high max, 85 m long and 17.5 m wide clifftop dune 30 km south of Dakhla in Morocco, NW Africa, during highly oblique incident wind conditions. Multiple 2D sonic and cup/vane anemometers and sand traps were utilized for measurements. Flow steering was significant on the upper climbing dune. Flow deceleration occurred near the dune toe, and topographic forcing of flow was considerable on the upper slopes of the climbing dune. Near-surface flow steadiness (CV U1 ,CV U0.25 ) on the climbing dune straight slope segment was low and constant. The distance upslope over which the airflow reached a speed comparable to that on the beach increases as the incident wind speed increases. The greatest flow acceleration and speed-up was observed at the cliff edge reaching 250% at 1 m height and 220% at 0.25 m height for the lowest incident wind speed class (4–5 m/s). The sand transport rate declined from the beach to the climbing dune toe and lower slope, but at the uppermost section of the climbing dune was 4 times higher than in the beach for the 7–8 m/s incident wind speed. Sand in aeolian transport was generally finer than surface sand, with the mean grain size increasing up the slope. A comparison of the sand transport data collected with sand transport models, and the effects of slope on Aeolian transport are also examined.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorTomczak, Joanna O.
dc.contributor.authorHesp, Patrick A.
dc.contributor.authorRotnicka-Dłużewska, Joanna
dc.contributor.authorDłużewski, Maciej
dc.date.accessioned2024-01-24T15:40:20Z
dc.date.available2024-01-24T15:40:20Z
dc.date.copyright2023-11-08
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number11
dc.description.versionFINAL_PUBLISHED
dc.description.volume128
dc.identifier.doi10.1029/2023JF007316
dc.identifier.issn2169-9003
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100376
dc.identifier.weblinkhttps://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023JF007316
dc.languageeng
dc.pbn.affiliationearth and related environmental sciences
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
dc.rightsCC-BY
dc.sciencecloudnosend
dc.subject.encliff-top dune
dc.subject.enclimbing dune
dc.subject.enflow dynamics
dc.subject.enAeolian sand transport
dc.subject.encoastal
dc.subject.enMorocco
dc.subject.enNW Africa
dc.titleAirflow Dynamics and Aeolian Sand Transport Across a Beach‐Climbing Dune‐Clifftop Dune System
dc.typeJournalArticle
dspace.entity.typePublication