Residual water transport in the Marsdiep tidal inlet inferred from observations and a numerical model
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ID: 303485
2016
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Abstract
At tidal inlets large amounts of water are exchanged with the adjacent sea during the tidal cycle.The residual flows, the net effect of ebb and flood, are generally small compared to the gross flux, they vary in magnitude and sign from one tidal period to the other, and their long-term mean varies from year to year.Here we focus on the temporal variability of the residual flows in the Marsdiep tidal inlet, which is the western-most inlet of the Wadden Sea, a tidal lagoon along the coasts of the Netherlands, Germany and Denmark.We compare the transport from a high-resolution numerical model with the transport from velocity profile data collected beneath a ferry that crosses the inlet daily.The comparison works in two ways: for the areas and times covered by the measurements, the data serves to validate the model, and conversely, the model is employed to assess the consequences of spatial and temporal gaps in the data.Modeled and observed transports over the region of the flow that is covered by the ADCP are in good agreement for gross and residual quantities.Results indicate that uncertainties due to spatial gaps can be overcome with a simple extrapolation approach applied to the velocity profiles, whereas uncertainties due to temporal gaps are more problematic and leave large discrepancies in the residuals.Summary of statistics of the residuals for the year 2009 based on the full series (Full), the series restricted to the times of the ferry crossing (6AM-10PM), the series with gaps as in the observations (ADCP scope), and the residuals obtained by subtracting from the full series the reconstructed series obtained with harmonic analysis.Also shown the Pearson's r between estimates with the full series (first row, assumed here to be the true residual transport) and estimates with all other approaches (the rest of the rows).All quantities in m 3 s -1 , except for the skewness and the coefficient of correlation that have no units. . . . . . . . . . . .
| Reference Key |
openalex_W2328566701
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| Authors | Maximiliano Sassi, Theo Gerkema, Matias Duran‐Matute, Janine J. Nauw |
| Journal | journal of marine research |
| Year | 2016 |
| DOI |
10.1357/002224016818377586
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| URL | |
| Keywords | Keywords not found |
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