Beach fetch distance and aeolian sediment transport

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

An experiment was conducted to examine the influence of fetch distance on aeolian sediment transport on a natural sand beach at Benone Strand, County Londonderry, Northern Ireland. The site consisted of a wide dissipative beach, approximately 150 m wide at low tide and 80 m wide during high tide. Surface moisture levels (and hence dry fetch distance) were dictated by both local groundwater, from a stream outlet across the beach, as well as local tidal levels. An abundant dry sediment supply was available during the experiment. High-resolution (1 Hz) measurements were made of wind speed and direction along with sediment nux. Wind velocity ranged from 2.1 to 8.1 m s(-1) during the study. Second-order polynomial sand transport equations were derived from the wind speed and trap results with r(2) values of better than 0.93 for all data. When the data were sorted into velocity bins of 1 m s(-1), there was no discernible relationship between fetch distance and sand transport, with a measured fetch distance range of 10-58 m available during the experiment. Results show that fetch distance is unimportant when an adequate sand supply is available. However, it is suggested that fetch may restrict the development of steady-state transport under sediment-limited conditions. Sediment availability is thus identified as a key variable in aeolian transport studies on natural beaches.
LanguageEnglish
Pages517-522
JournalSedimentology
Volume46
Issue number3
Publication statusPublished - Jun 1999

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fetch
sediment transport
beach
sand
wind velocity
sediment
tide
experiment
wind direction
moisture
groundwater

Keywords

  • aeolian
  • beach
  • fetch
  • sand transport

Cite this

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title = "Beach fetch distance and aeolian sediment transport",
abstract = "An experiment was conducted to examine the influence of fetch distance on aeolian sediment transport on a natural sand beach at Benone Strand, County Londonderry, Northern Ireland. The site consisted of a wide dissipative beach, approximately 150 m wide at low tide and 80 m wide during high tide. Surface moisture levels (and hence dry fetch distance) were dictated by both local groundwater, from a stream outlet across the beach, as well as local tidal levels. An abundant dry sediment supply was available during the experiment. High-resolution (1 Hz) measurements were made of wind speed and direction along with sediment nux. Wind velocity ranged from 2.1 to 8.1 m s(-1) during the study. Second-order polynomial sand transport equations were derived from the wind speed and trap results with r(2) values of better than 0.93 for all data. When the data were sorted into velocity bins of 1 m s(-1), there was no discernible relationship between fetch distance and sand transport, with a measured fetch distance range of 10-58 m available during the experiment. Results show that fetch distance is unimportant when an adequate sand supply is available. However, it is suggested that fetch may restrict the development of steady-state transport under sediment-limited conditions. Sediment availability is thus identified as a key variable in aeolian transport studies on natural beaches.",
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journal = "Sedimentology",
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Beach fetch distance and aeolian sediment transport. / Jackson, Derek; Cooper, Andrew.

In: Sedimentology, Vol. 46, No. 3, 06.1999, p. 517-522.

Research output: Contribution to journalArticle

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T1 - Beach fetch distance and aeolian sediment transport

AU - Jackson, Derek

AU - Cooper, Andrew

PY - 1999/6

Y1 - 1999/6

N2 - An experiment was conducted to examine the influence of fetch distance on aeolian sediment transport on a natural sand beach at Benone Strand, County Londonderry, Northern Ireland. The site consisted of a wide dissipative beach, approximately 150 m wide at low tide and 80 m wide during high tide. Surface moisture levels (and hence dry fetch distance) were dictated by both local groundwater, from a stream outlet across the beach, as well as local tidal levels. An abundant dry sediment supply was available during the experiment. High-resolution (1 Hz) measurements were made of wind speed and direction along with sediment nux. Wind velocity ranged from 2.1 to 8.1 m s(-1) during the study. Second-order polynomial sand transport equations were derived from the wind speed and trap results with r(2) values of better than 0.93 for all data. When the data were sorted into velocity bins of 1 m s(-1), there was no discernible relationship between fetch distance and sand transport, with a measured fetch distance range of 10-58 m available during the experiment. Results show that fetch distance is unimportant when an adequate sand supply is available. However, it is suggested that fetch may restrict the development of steady-state transport under sediment-limited conditions. Sediment availability is thus identified as a key variable in aeolian transport studies on natural beaches.

AB - An experiment was conducted to examine the influence of fetch distance on aeolian sediment transport on a natural sand beach at Benone Strand, County Londonderry, Northern Ireland. The site consisted of a wide dissipative beach, approximately 150 m wide at low tide and 80 m wide during high tide. Surface moisture levels (and hence dry fetch distance) were dictated by both local groundwater, from a stream outlet across the beach, as well as local tidal levels. An abundant dry sediment supply was available during the experiment. High-resolution (1 Hz) measurements were made of wind speed and direction along with sediment nux. Wind velocity ranged from 2.1 to 8.1 m s(-1) during the study. Second-order polynomial sand transport equations were derived from the wind speed and trap results with r(2) values of better than 0.93 for all data. When the data were sorted into velocity bins of 1 m s(-1), there was no discernible relationship between fetch distance and sand transport, with a measured fetch distance range of 10-58 m available during the experiment. Results show that fetch distance is unimportant when an adequate sand supply is available. However, it is suggested that fetch may restrict the development of steady-state transport under sediment-limited conditions. Sediment availability is thus identified as a key variable in aeolian transport studies on natural beaches.

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KW - sand transport

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