The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea
Wind, wave and current measurements were carried in the nearshore zone of the Canadian Beaufort Sea at two coastal sites having distinct morphologies. The first site is a sandy beach backed by a low bluff, while the second site consists of low-lying barriers. Computation of potential sediment transp...
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Journal of Coastal Research
2001
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ftfloridaojojs:oai:journals.flvc.org:article/81359 2023-05-15T15:40:20+02:00 The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea Hequette, Arnaud Desrosiers, Marc Hill, Philip R. Forbes, Donald L. 2001-07-27 application/pdf https://journals.flvc.org/jcr/article/view/81359 eng eng Journal of Coastal Research https://journals.flvc.org/jcr/article/view/81359/78498 https://journals.flvc.org/jcr/article/view/81359 Journal of Coastal Research; Vol 17 No 3 (2001): Journal of Coastal Research 0749-0208 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2001 ftfloridaojojs 2020-11-14T19:21:59Z Wind, wave and current measurements were carried in the nearshore zone of the Canadian Beaufort Sea at two coastal sites having distinct morphologies. The first site is a sandy beach backed by a low bluff, while the second site consists of low-lying barriers. Computation of potential sediment transport using a numerical model for combined flow conditions (LI and AMOS, 1993) suggests that coastal morphology may play a significant role on circulation and sediment transport on the shoreface during storm events. Downwelling near-bottom currents and offshore sediment transport were observed at all sites during storm surges, but with some variations in the shoreface current patterns and sediment transport. According to the numerical model used in this study, offshore sediment transport is more significant where the beach is backed by a bluff acting as a natural barrier. Such condition appears to be favorable to the development of strong seaward-directed horizontal pressure gradients that drive offshore bottom currents. Along low barriers that are easily submerged and overwashed, sediment transport is mainly directed obliquely offshore due to more limited set-up of sea level at the coast during storm surges. These results suggest that coastal morphology may be responsible for variable offshore sediment dispersal on the shoreface during storms. Our results show that sediment may be transported offshore to depths from which fairweather waves may not be capable of returning the material onshore. Consequently, a loss of material to the offshore may be greater where overwashing is restricted due to the presence of a coastal feature that acts as a boundary for onshore-driven surface waters. Article in Journal/Newspaper Beaufort Sea Florida Online Journals (FloridaOJ) Fairweather ENVELOPE(-61.083,-61.083,-65.017,-65.017) Low Bluff ENVELOPE(178.983,178.983,51.583,51.583) Sandy Beach ENVELOPE(-55.731,-55.731,49.917,49.917) |
institution |
Open Polar |
collection |
Florida Online Journals (FloridaOJ) |
op_collection_id |
ftfloridaojojs |
language |
English |
description |
Wind, wave and current measurements were carried in the nearshore zone of the Canadian Beaufort Sea at two coastal sites having distinct morphologies. The first site is a sandy beach backed by a low bluff, while the second site consists of low-lying barriers. Computation of potential sediment transport using a numerical model for combined flow conditions (LI and AMOS, 1993) suggests that coastal morphology may play a significant role on circulation and sediment transport on the shoreface during storm events. Downwelling near-bottom currents and offshore sediment transport were observed at all sites during storm surges, but with some variations in the shoreface current patterns and sediment transport. According to the numerical model used in this study, offshore sediment transport is more significant where the beach is backed by a bluff acting as a natural barrier. Such condition appears to be favorable to the development of strong seaward-directed horizontal pressure gradients that drive offshore bottom currents. Along low barriers that are easily submerged and overwashed, sediment transport is mainly directed obliquely offshore due to more limited set-up of sea level at the coast during storm surges. These results suggest that coastal morphology may be responsible for variable offshore sediment dispersal on the shoreface during storms. Our results show that sediment may be transported offshore to depths from which fairweather waves may not be capable of returning the material onshore. Consequently, a loss of material to the offshore may be greater where overwashing is restricted due to the presence of a coastal feature that acts as a boundary for onshore-driven surface waters. |
format |
Article in Journal/Newspaper |
author |
Hequette, Arnaud Desrosiers, Marc Hill, Philip R. Forbes, Donald L. |
spellingShingle |
Hequette, Arnaud Desrosiers, Marc Hill, Philip R. Forbes, Donald L. The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
author_facet |
Hequette, Arnaud Desrosiers, Marc Hill, Philip R. Forbes, Donald L. |
author_sort |
Hequette, Arnaud |
title |
The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
title_short |
The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
title_full |
The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
title_fullStr |
The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
title_full_unstemmed |
The Influence of Coastal Morphology on Shoreface Sediment Transport under Storm Combined Flows, Canadian Beaufort Sea |
title_sort |
influence of coastal morphology on shoreface sediment transport under storm combined flows, canadian beaufort sea |
publisher |
Journal of Coastal Research |
publishDate |
2001 |
url |
https://journals.flvc.org/jcr/article/view/81359 |
long_lat |
ENVELOPE(-61.083,-61.083,-65.017,-65.017) ENVELOPE(178.983,178.983,51.583,51.583) ENVELOPE(-55.731,-55.731,49.917,49.917) |
geographic |
Fairweather Low Bluff Sandy Beach |
geographic_facet |
Fairweather Low Bluff Sandy Beach |
genre |
Beaufort Sea |
genre_facet |
Beaufort Sea |
op_source |
Journal of Coastal Research; Vol 17 No 3 (2001): Journal of Coastal Research 0749-0208 |
op_relation |
https://journals.flvc.org/jcr/article/view/81359/78498 https://journals.flvc.org/jcr/article/view/81359 |
_version_ |
1766372547508568064 |