Dynamics of fortnightly water level variations along a tide-dominated estuary with negligible river discharge
<p>Observations indicate that the fortnightly fluctuations in the mean amplitude of water level increase in the upstream direction along the lower half of a tide-dominated estuary (the Guadiana Estuary), with negligible river discharge, but remain constant upstream. Analytical solutions reprod...
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/652630bfe0fb471ea07fdeb7435cd3ec |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | <p>Observations indicate that the fortnightly fluctuations in the mean amplitude of water level increase in the upstream direction along
the lower half of a tide-dominated estuary (the Guadiana Estuary), with negligible
river discharge, but remain constant upstream. Analytical solutions
reproducing the semi-diurnal wave propagation shows that this pattern
results from reflection effects at the estuary head. The phase difference
between velocity and elevation increases from the mouth to the head (where
the wave has a standing nature) as the timing of high and low water levels
come progressively closer to slack water. Thus, the tidal (flood–ebb)
asymmetry in discharge is reduced in the upstream direction. It becomes
negligible along the upper estuary half as the mean sea level remains
constant despite increased friction due to wave shoaling. Observations of a
flat mean water level along a significant portion of an upper estuary
suggest a standing wave character and, thus, indicate significant reflection of the propagating semi-diurnal wave at the head. Details of the analytical model show that changes in the mean depth or length of semi-arid estuaries, in particular for macrotidal locations, affect the fortnightly tide amplitude and, thus, the upstream mass transport and inundation regime. This has significant potential impacts on the estuarine environment in terms of ecosystem management.</p> |
|---|