Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model
Headland and groyne sand bypassing greatly influences embayment dynamics at medium to long timescales, but is often disregarded or partially included in reduced-complexity shoreline models. This study explores how accounting for subaqueous sediment bypassing in a shoreline model affects mean embayed...
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MDPI AG
2024-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/12/12/2266 |
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| author | Elsa Durand Bruno Castelle Déborah Idier Vincent Marieu Arthur Robinet Thomas Guérin |
| author_facet | Elsa Durand Bruno Castelle Déborah Idier Vincent Marieu Arthur Robinet Thomas Guérin |
| author_sort | Elsa Durand |
| collection | DOAJ |
| description | Headland and groyne sand bypassing greatly influences embayment dynamics at medium to long timescales, but is often disregarded or partially included in reduced-complexity shoreline models. This study explores how accounting for subaqueous sediment bypassing in a shoreline model affects mean embayed beach planshape and spatial variability. We implement a generic parametrization of sand bypassing in the LX-Shore model, with simulations on a synthetic embayment in two configurations: “full bypassing” (FB) where the sediments bypass the obstacle in the surfzone and beyond, and “shoreline bypassing” (SB) where bypassing occurs only when the shoreline extends beyond the obstacle. Time-invariant wave simulations show significant differences in updrift shoreline position between FB and SB. Simulations with time-varying wave angles and fixed wave height and period reveal that FB significantly impacts the embayment mean planform and spatial variability: FB reduces beach rotation by about 1/3, particularly under slightly oblique and slightly asymmetrical wave climates, and decreases shoreline curvature, especially under highly oblique wave climates. Downdrift shoreline erosion may be overestimated by up to 20% under SB. Our simulations provide new insight into the influence of subaqueous sand bypassing on embayed beach dynamics and emphasize the importance of including this process when modelling shoreline evolution in coastal embayments. |
| format | Article |
| id | doaj-art-e5d5a1497d3f4735b79d453f02178178 |
| institution | DOAJ |
| issn | 2077-1312 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-e5d5a1497d3f4735b79d453f021781782025-08-20T02:56:55ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-12-011212226610.3390/jmse12122266Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline ModelElsa Durand0Bruno Castelle1Déborah Idier2Vincent Marieu3Arthur Robinet4Thomas Guérin5Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, FranceUniv. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, FranceBureau de Recherches Géologiques et Minières (BRGM), 3 Avenue Guillemin, 45100 Orléans, FranceUniv. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, FranceBureau de Recherches Géologiques et Minières (BRGM), 24 Avenue Léonard de Vinci, 33600 Pessac, FranceWaeles Marine Consultants, 53 rue du Commandant Groix, 29200 Brest, FranceHeadland and groyne sand bypassing greatly influences embayment dynamics at medium to long timescales, but is often disregarded or partially included in reduced-complexity shoreline models. This study explores how accounting for subaqueous sediment bypassing in a shoreline model affects mean embayed beach planshape and spatial variability. We implement a generic parametrization of sand bypassing in the LX-Shore model, with simulations on a synthetic embayment in two configurations: “full bypassing” (FB) where the sediments bypass the obstacle in the surfzone and beyond, and “shoreline bypassing” (SB) where bypassing occurs only when the shoreline extends beyond the obstacle. Time-invariant wave simulations show significant differences in updrift shoreline position between FB and SB. Simulations with time-varying wave angles and fixed wave height and period reveal that FB significantly impacts the embayment mean planform and spatial variability: FB reduces beach rotation by about 1/3, particularly under slightly oblique and slightly asymmetrical wave climates, and decreases shoreline curvature, especially under highly oblique wave climates. Downdrift shoreline erosion may be overestimated by up to 20% under SB. Our simulations provide new insight into the influence of subaqueous sand bypassing on embayed beach dynamics and emphasize the importance of including this process when modelling shoreline evolution in coastal embayments.https://www.mdpi.com/2077-1312/12/12/2266sand bypassingembayed beachreduced-complexity shoreline modelequilibrium beach planformrotationcurvature |
| spellingShingle | Elsa Durand Bruno Castelle Déborah Idier Vincent Marieu Arthur Robinet Thomas Guérin Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model Journal of Marine Science and Engineering sand bypassing embayed beach reduced-complexity shoreline model equilibrium beach planform rotation curvature |
| title | Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model |
| title_full | Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model |
| title_fullStr | Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model |
| title_full_unstemmed | Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model |
| title_short | Influence of Rocky Obstacle Sand Bypassing on Embayed Beach Dynamics Using a Reduced-Complexity Shoreline Model |
| title_sort | influence of rocky obstacle sand bypassing on embayed beach dynamics using a reduced complexity shoreline model |
| topic | sand bypassing embayed beach reduced-complexity shoreline model equilibrium beach planform rotation curvature |
| url | https://www.mdpi.com/2077-1312/12/12/2266 |
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