Articles | Volume 17, issue 6
https://doi.org/10.5194/os-17-1753-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-17-1753-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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02 Dec 2021
Research article | Highlight paper |
| 02 Dec 2021
| 02 Dec 2021
Rectified tidal transport in Lofoten–Vesterålen, northern Norway
Eli Børve
CORRESPONDING AUTHOR
Department of Geosciences, University of Oslo, 0315 Oslo, Norway
Akvaplan-niva AS, 9296 Tromsø, Norway
Pål Erik Isachsen
Department of Geosciences, University of Oslo, 0315 Oslo, Norway
The Norwegian Meteorological Institute, 0371 Oslo, Norway
Ole Anders Nøst
Faculty of Biosciences and Aquaculture, Nord University, 8026 Bodø, Norway
Akvaplan-niva AS, 7462 Trondheim, Norway
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Ocean Sci., 17, 1403–1420, https://doi.org/10.5194/os-17-1403-2021, https://doi.org/10.5194/os-17-1403-2021, 2021
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A narrow tidal strait often leads to net transport in one direction, and the water flowing through the strait is not the same as the water that is drawn back into the strait when the tidal flow turns. We investigated this process by simulating the transport through tidal straits of different lengths and widths. A simple theory is established that describes the net transport. The theory can be applied to real coastlines when predicting spreading of pollution and other substances in the ocean.
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Lagrangian coherent structures (LCS) describe material transport in ocean flow by describing transport barriers and accumulation regions. Noting that circulation fields from models are prone to uncertainties, we discuss the implications for LCS analysis. LCSs add value to forecasting when these are certain and long-lived. Averaging LCS reveals where these are more certain and long-lived, often influenced by bottom topography. Large scale LCSs show a higher degree of certainty and longevity.
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We show that tidally generated eddies generated near the constriction of a channel can drive a strong and fluctuating flow field far downstream of the channel constriction itself. The velocity signal has been observed in other studies, but this is the first study linking it to a physical process. Eddies such as those we found are generated because of complex coastal geometry, suggesting that, for example, land-reclamation projects in channels may enhance current shear over a large area.
Ole Anders Nøst and Eli Børve
Ocean Sci., 17, 1403–1420, https://doi.org/10.5194/os-17-1403-2021, https://doi.org/10.5194/os-17-1403-2021, 2021
Short summary
Short summary
A narrow tidal strait often leads to net transport in one direction, and the water flowing through the strait is not the same as the water that is drawn back into the strait when the tidal flow turns. We investigated this process by simulating the transport through tidal straits of different lengths and widths. A simple theory is established that describes the net transport. The theory can be applied to real coastlines when predicting spreading of pollution and other substances in the ocean.
Johannes S. Dugstad, Pål Erik Isachsen, and Ilker Fer
Ocean Sci., 17, 651–674, https://doi.org/10.5194/os-17-651-2021, https://doi.org/10.5194/os-17-651-2021, 2021
Short summary
Short summary
We quantify the mesoscale eddy field in the Lofoten Basin using Lagrangian model trajectories and aim to estimate the relative importance of eddies compared to the ambient flow in transporting warm Atlantic Water to the Lofoten Basin as well as modifying it. Water properties are largely changed in eddies compared to the ambient flow. However, only a relatively small fraction of eddies is detected in the basin. The ambient flow therefore dominates the heat transport to the Lofoten Basin.
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Short summary
Non-linear tidal dynamics can produce prominent time-mean transport in coastal regions where strong tidal currents interact with topography. We investigate tidal-induced transport using a tidally driven ocean model for Lofoten–Vesterålen in northern Norway and find that both tidal pumping and tidal rectification can play an important role for time-mean transport in the region. The study emphasizes the importance of non-linear tidal dynamics for time-mean transport in complex coastal regions.
Non-linear tidal dynamics can produce prominent time-mean transport in coastal regions where...
