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Interactions between airflow and valley topography with implications for aeolian sediment transport

Interactions between airflow and valley topography with implications for aeolian sediment transport
Interactions between airflow and valley topography with implications for aeolian sediment transport
The local topography of a landscape can have a profound influence on airflow characteristics and cause modifications to broader synoptic scale winds. This paper reports the results of a preliminary field study examining the effects of a valley on wind velocity and direction. Anemometers and wind vanes were used to measure airflow characteristics upwind, within and downwind of a 20 m deep and 175 m wide dry valley in the central Namib desert. The field data indicate an upwind region of flow acceleration, a minimum in flow velocity in the center of the valley, flow acceleration toward a maximum at the downwind valley edge and subsequent deceleration toward starting velocities downwind of this edge. The development of a flow separation region at the leading edge of the valley and the range of flow distortion are affected by the incident angle of the approaching wind to the axis of the valley. A conceptual model indicating the potential implications of these findings for aeolian sediment transport processes in the vicinity of dryland valleys is presented.
airflow, topography, sediment transport
366-380
Wiggs, G.F.S.
a8348f6c-f651-4a93-9215-ee4becdf2318
Bullard, J.E.
5bf62869-6bd6-455f-a662-3d67b85180fe
Garvey, B.
9f335c1b-3320-4bbe-a3e8-1e95fbc669e6
Castro, I.
66e6330d-d93a-439a-a69b-e061e660de61
Wiggs, G.F.S.
a8348f6c-f651-4a93-9215-ee4becdf2318
Bullard, J.E.
5bf62869-6bd6-455f-a662-3d67b85180fe
Garvey, B.
9f335c1b-3320-4bbe-a3e8-1e95fbc669e6
Castro, I.
66e6330d-d93a-439a-a69b-e061e660de61

Wiggs, G.F.S., Bullard, J.E., Garvey, B. and Castro, I. (2002) Interactions between airflow and valley topography with implications for aeolian sediment transport. Physical Geography, 23, 366-380.

Record type: Article

Abstract

The local topography of a landscape can have a profound influence on airflow characteristics and cause modifications to broader synoptic scale winds. This paper reports the results of a preliminary field study examining the effects of a valley on wind velocity and direction. Anemometers and wind vanes were used to measure airflow characteristics upwind, within and downwind of a 20 m deep and 175 m wide dry valley in the central Namib desert. The field data indicate an upwind region of flow acceleration, a minimum in flow velocity in the center of the valley, flow acceleration toward a maximum at the downwind valley edge and subsequent deceleration toward starting velocities downwind of this edge. The development of a flow separation region at the leading edge of the valley and the range of flow distortion are affected by the incident angle of the approaching wind to the axis of the valley. A conceptual model indicating the potential implications of these findings for aeolian sediment transport processes in the vicinity of dryland valleys is presented.

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Published date: 2002
Keywords: airflow, topography, sediment transport

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Local EPrints ID: 22595
URI: http://eprints.soton.ac.uk/id/eprint/22595
PURE UUID: 3cda8d51-a811-4e73-8c72-f13daac7cbe5

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Date deposited: 27 Mar 2006
Last modified: 18 Nov 2019 19:22

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Contributors

Author: G.F.S. Wiggs
Author: J.E. Bullard
Author: B. Garvey
Author: I. Castro

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