Skimming Flow and Sand Transport Within and Above <i>Ammophila</i> (Marram) Grass on a Foredune

Hesp, Patrick A.; Rotnicka, Joanna; Dłużewski, Maciej; Tomczak, Joanna Oliwia

doi:10.1029/2023jf007143

Cited by 4 publications

(1 citation statement)

References 118 publications

(306 reference statements)

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“…The total sand transport rate was measured by means of 0.5 m high passive sand traps composed of a steel casing and removable plexiglass catcher divided into 40 cells, each 1.27 cm high and 1 cm wide (Figure 4b; Rotnicka, 2013aRotnicka, , 2013bRotnicka et al, 2023). The trap design allows for continuous accumulation of sand transported to a height of 0.5 m, and its efficiency has been estimated for medium sand at 82% regardless of wind speed.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

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

Dłużewski,

Rotnicka,

Hesp

et al. 2023

JGR Earth Surface

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This 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 (CVU1, CVU0.25) 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.

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Section: Experimental Setup and Measurementsmentioning

confidence: 99%

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

Dłużewski,

Rotnicka,

Hesp

et al. 2023

JGR Earth Surface

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Fetch‐driven aeolian sediment transport on a sandy beach: A new study

Strypsteen,

Delgado‐Fernandez,

Derijckere

et al. 2024

Earth Surf Processes Landf

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This study examines the effect of fetch distance on aeolian sediment transport and the corresponding growth rate of aeolian transport rate on a sandy beach under varying wind speeds. Eight experiments were conducted on both dry and intertidal beach areas, with wind speeds ranging from 9 to 17 m/s. Vertically stacked sand traps were used to measure transport rates over distances up to 100 m, with experiments lasting 20–40 minutes. Results indicate an initial increase in transport rate until the critical fetch distance, followed by a subsequent decrease in sediment transport with further fetch distance. Critical fetch distances, corresponding to maximum transport rates, ranged from 23.8 to 103.5 m. A strong linear correlation was observed between wind speed and critical fetch distance, suggesting that higher wind speeds necessitate longer fetch distances for maximum transport. Furthermore, established formulations by van Rijn and Strypsteen are tested to estimate maximum sediment transport and critical fetch distance based on grain‐related shear velocity. Combining all experiments showed that the growth rate in transport up to the point of critical fetch can be best described by a trigonometric function. These findings contribute to a better understanding of the fetch effect on aeolian sediment dynamics in coastal sandy environments.

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The influence of backdune morphology on air flow dynamics through an excavated foredune notch

Nguyen,

Wakes,

Hilton

2024

Aeolian Research

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Skimming Flow and Sand Transport Within and Above Ammophila (Marram) Grass on a Foredune

Cited by 4 publications

References 118 publications

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

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

Fetch‐driven aeolian sediment transport on a sandy beach: A new study

The influence of backdune morphology on air flow dynamics through an excavated foredune notch

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