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Non-linear aspects of the tidal dynamics in the Sylt-Rømø Bight, south-eastern North Sea
This study is dedicated to the tidal dynamics in the Sylt-Rømø Bight with a focus on the non-linear processes. The FESOM-C model was used as the numerical tool, which works with triangular, rectangular or mixed grids and is equipped with a wetting/drying option. As the model's success at resolv...
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Published in: | Ocean science 2019-12, Vol.15 (6), p.1761-1782 |
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description | This study is dedicated to the tidal dynamics in the Sylt-Rømø Bight with a focus on the non-linear processes. The FESOM-C model was used as the numerical tool, which works with triangular, rectangular or mixed grids and is equipped with a wetting/drying option. As the model's success at resolving currents largely depends on the quality of the bathymetric data, we have created a new bathymetric map for an area based on recent studies of Lister Deep, Lister Ley, Højer Deep and Rømø Deep. This new bathymetric product made it feasible to work with high-resolution grids (up to 2 m in the wetting/drying zone). As a result, we were able to study the tidal energy transformation and the role of higher harmonics in the domain in detail. For the first time, the tidal ellipses, maximum tidally induced velocities, energy fluxes and residual circulation maps were constructed and analysed for the entire bight. Additionally, tidal asymmetry maps were introduced and constructed. The full analysis was performed on two grids with different structures and showed a convergence of the results as well as fulfilment of the energy balance. A great deal of attention has been paid to the selection of open-boundary conditions, model validation against tide gauges and recent in situ current data. The tidal residual circulation and asymmetric tidal cycles largely define the circulation pattern, transport and accumulation of sediment, and the distribution of bedforms in the bight; therefore, the results presented in the article are necessary and useful benchmarks for further studies in the area, including baroclinic and sediment dynamics investigations. |
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Christian ; Wiltshire, Karen H.</creator><creatorcontrib>Fofonova, Vera ; Androsov, Alexey ; Sander, Lasse ; Kuznetsov, Ivan ; Amorim, Felipe ; Hass, H. Christian ; Wiltshire, Karen H.</creatorcontrib><description>This study is dedicated to the tidal dynamics in the Sylt-Rømø Bight with a focus on the non-linear processes. The FESOM-C model was used as the numerical tool, which works with triangular, rectangular or mixed grids and is equipped with a wetting/drying option. As the model's success at resolving currents largely depends on the quality of the bathymetric data, we have created a new bathymetric map for an area based on recent studies of Lister Deep, Lister Ley, Højer Deep and Rømø Deep. This new bathymetric product made it feasible to work with high-resolution grids (up to 2 m in the wetting/drying zone). As a result, we were able to study the tidal energy transformation and the role of higher harmonics in the domain in detail. For the first time, the tidal ellipses, maximum tidally induced velocities, energy fluxes and residual circulation maps were constructed and analysed for the entire bight. Additionally, tidal asymmetry maps were introduced and constructed. The full analysis was performed on two grids with different structures and showed a convergence of the results as well as fulfilment of the energy balance. A great deal of attention has been paid to the selection of open-boundary conditions, model validation against tide gauges and recent in situ current data. The tidal residual circulation and asymmetric tidal cycles largely define the circulation pattern, transport and accumulation of sediment, and the distribution of bedforms in the bight; therefore, the results presented in the article are necessary and useful benchmarks for further studies in the area, including baroclinic and sediment dynamics investigations.</description><identifier>ISSN: 1812-0792</identifier><identifier>ISSN: 1812-0784</identifier><identifier>EISSN: 1812-0792</identifier><identifier>DOI: 10.5194/os-15-1761-2019</identifier><language>eng</language><publisher>Katlenburg-Lindau: Copernicus GmbH</publisher><subject>Asymmetry ; Bathymetric data ; Bed forms ; Benchmarks ; Boundary conditions ; Circulation patterns ; Current data ; Drying ; Energy balance ; Energy conversion ; Energy transformation ; Fluxes ; Gauges ; Higher harmonics ; Islands ; Residual circulation ; Sediment ; Sediment dynamics ; Sedimentary structures ; Sediments ; Simulation ; Tidal circulation ; Tidal cycles ; Tidal dynamics ; Tidal energy ; Tidal power ; Tide gauges ; Tides ; Turbulence models ; Velocity ; Wetting</subject><ispartof>Ocean science, 2019-12, Vol.15 (6), p.1761-1782</ispartof><rights>2019. 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Christian</creatorcontrib><creatorcontrib>Wiltshire, Karen H.</creatorcontrib><title>Non-linear aspects of the tidal dynamics in the Sylt-Rømø Bight, south-eastern North Sea</title><title>Ocean science</title><description>This study is dedicated to the tidal dynamics in the Sylt-Rømø Bight with a focus on the non-linear processes. The FESOM-C model was used as the numerical tool, which works with triangular, rectangular or mixed grids and is equipped with a wetting/drying option. As the model's success at resolving currents largely depends on the quality of the bathymetric data, we have created a new bathymetric map for an area based on recent studies of Lister Deep, Lister Ley, Højer Deep and Rømø Deep. This new bathymetric product made it feasible to work with high-resolution grids (up to 2 m in the wetting/drying zone). As a result, we were able to study the tidal energy transformation and the role of higher harmonics in the domain in detail. For the first time, the tidal ellipses, maximum tidally induced velocities, energy fluxes and residual circulation maps were constructed and analysed for the entire bight. Additionally, tidal asymmetry maps were introduced and constructed. The full analysis was performed on two grids with different structures and showed a convergence of the results as well as fulfilment of the energy balance. A great deal of attention has been paid to the selection of open-boundary conditions, model validation against tide gauges and recent in situ current data. 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Christian</au><au>Wiltshire, Karen H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Non-linear aspects of the tidal dynamics in the Sylt-Rømø Bight, south-eastern North Sea</atitle><jtitle>Ocean science</jtitle><date>2019-12-16</date><risdate>2019</risdate><volume>15</volume><issue>6</issue><spage>1761</spage><epage>1782</epage><pages>1761-1782</pages><issn>1812-0792</issn><issn>1812-0784</issn><eissn>1812-0792</eissn><abstract>This study is dedicated to the tidal dynamics in the Sylt-Rømø Bight with a focus on the non-linear processes. The FESOM-C model was used as the numerical tool, which works with triangular, rectangular or mixed grids and is equipped with a wetting/drying option. As the model's success at resolving currents largely depends on the quality of the bathymetric data, we have created a new bathymetric map for an area based on recent studies of Lister Deep, Lister Ley, Højer Deep and Rømø Deep. This new bathymetric product made it feasible to work with high-resolution grids (up to 2 m in the wetting/drying zone). As a result, we were able to study the tidal energy transformation and the role of higher harmonics in the domain in detail. For the first time, the tidal ellipses, maximum tidally induced velocities, energy fluxes and residual circulation maps were constructed and analysed for the entire bight. Additionally, tidal asymmetry maps were introduced and constructed. The full analysis was performed on two grids with different structures and showed a convergence of the results as well as fulfilment of the energy balance. A great deal of attention has been paid to the selection of open-boundary conditions, model validation against tide gauges and recent in situ current data. The tidal residual circulation and asymmetric tidal cycles largely define the circulation pattern, transport and accumulation of sediment, and the distribution of bedforms in the bight; therefore, the results presented in the article are necessary and useful benchmarks for further studies in the area, including baroclinic and sediment dynamics investigations.</abstract><cop>Katlenburg-Lindau</cop><pub>Copernicus GmbH</pub><doi>10.5194/os-15-1761-2019</doi><tpages>22</tpages><orcidid>https://orcid.org/0000-0001-5910-8081</orcidid><orcidid>https://orcid.org/0000-0002-5956-1844</orcidid><orcidid>https://orcid.org/0000-0003-1066-7952</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Asymmetry Bathymetric data Bed forms Benchmarks Boundary conditions Circulation patterns Current data Drying Energy balance Energy conversion Energy transformation Fluxes Gauges Higher harmonics Islands Residual circulation Sediment Sediment dynamics Sedimentary structures Sediments Simulation Tidal circulation Tidal cycles Tidal dynamics Tidal energy Tidal power Tide gauges Tides Turbulence models Velocity Wetting |
title | Non-linear aspects of the tidal dynamics in the Sylt-Rømø Bight, south-eastern North Sea |
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