Tidal exchange in a choked coastal lagoon : A study of Mundaú Lagoon in northeastern Brazil
(2018) In Regional Studies in Marine Science 17. p.133-142- Abstract
Changes in the inlet morphology of choked coastal lagoons often restrict the water exchange with the sea, making them vulnerable to pollution events and eutrophication processes. In this study, the importance of tides for the water exchange was investigated in Mundaú Lagoon, which is a choked lagoon located in northeastern Brazil that has a very dynamic inlet and channel system. The analysis was carried out for critical scenarios during the dry season when the river flow to the lagoon decreases markedly. The concepts of integrated flushing time and spatially distributed residence time scales were applied using a Lagrangian particle tracking approach coupled with a hydrodynamic model. The flushing time of Mundaú Lagoon was estimated to... (More)
Changes in the inlet morphology of choked coastal lagoons often restrict the water exchange with the sea, making them vulnerable to pollution events and eutrophication processes. In this study, the importance of tides for the water exchange was investigated in Mundaú Lagoon, which is a choked lagoon located in northeastern Brazil that has a very dynamic inlet and channel system. The analysis was carried out for critical scenarios during the dry season when the river flow to the lagoon decreases markedly. The concepts of integrated flushing time and spatially distributed residence time scales were applied using a Lagrangian particle tracking approach coupled with a hydrodynamic model. The flushing time of Mundaú Lagoon was estimated to be 12.6 days during neap tide and 5.7 days during spring tide, including a return flow factor. Employing an e-folding form, the corresponding value was calculated to be 64 and 54 days for particles allowed and not allowed to return to the lagoon, respectively. The spring tides were responsible for the most pronounced water exchange in the Mundaú Lagoon. Different particles release times displayed the effect of the initial tidal conditions on the flushing time; lower exchange times were estimated for releases during ebb tides and spring tides. The integrated estimation of the water exchange when imposing a scenario of most frequent wind conditions indicated a considerable delay caused by this forcing, increasing the flushing time up to 23 days. Another observed effect of the wind was a spatial redistribution of the tidal exchange in the lagoon into different zones with similar residence time.
(Less)
- author
- de Brito, Almir Nunes LU ; Fragoso, Carlos Ruberto and Larson, Magnus LU
- organization
- publishing date
- 2018-01-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Brazil, Choked coastal lagoon, Exchange time scales, Mundaú lagoon, Numerical modeling, Particle transport, Residence time
- in
- Regional Studies in Marine Science
- volume
- 17
- pages
- 10 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85039728152
- ISSN
- 2352-4855
- DOI
- 10.1016/j.rsma.2017.12.005
- project
- Simulating Morphological Evolution at Coastal Inlets due to Waves and Currents
- language
- English
- LU publication?
- yes
- id
- d369a60c-385a-421b-af3e-74d35f9b7291
- date added to LUP
- 2018-01-09 11:08:00
- date last changed
- 2022-03-17 03:31:42
@article{d369a60c-385a-421b-af3e-74d35f9b7291,
abstract = {{<p>Changes in the inlet morphology of choked coastal lagoons often restrict the water exchange with the sea, making them vulnerable to pollution events and eutrophication processes. In this study, the importance of tides for the water exchange was investigated in Mundaú Lagoon, which is a choked lagoon located in northeastern Brazil that has a very dynamic inlet and channel system. The analysis was carried out for critical scenarios during the dry season when the river flow to the lagoon decreases markedly. The concepts of integrated flushing time and spatially distributed residence time scales were applied using a Lagrangian particle tracking approach coupled with a hydrodynamic model. The flushing time of Mundaú Lagoon was estimated to be 12.6 days during neap tide and 5.7 days during spring tide, including a return flow factor. Employing an e-folding form, the corresponding value was calculated to be 64 and 54 days for particles allowed and not allowed to return to the lagoon, respectively. The spring tides were responsible for the most pronounced water exchange in the Mundaú Lagoon. Different particles release times displayed the effect of the initial tidal conditions on the flushing time; lower exchange times were estimated for releases during ebb tides and spring tides. The integrated estimation of the water exchange when imposing a scenario of most frequent wind conditions indicated a considerable delay caused by this forcing, increasing the flushing time up to 23 days. Another observed effect of the wind was a spatial redistribution of the tidal exchange in the lagoon into different zones with similar residence time.</p>}},
author = {{de Brito, Almir Nunes and Fragoso, Carlos Ruberto and Larson, Magnus}},
issn = {{2352-4855}},
keywords = {{Brazil; Choked coastal lagoon; Exchange time scales; Mundaú lagoon; Numerical modeling; Particle transport; Residence time}},
language = {{eng}},
month = {{01}},
pages = {{133--142}},
publisher = {{Elsevier}},
series = {{Regional Studies in Marine Science}},
title = {{Tidal exchange in a choked coastal lagoon : A study of Mundaú Lagoon in northeastern Brazil}},
url = {{http://dx.doi.org/10.1016/j.rsma.2017.12.005}},
doi = {{10.1016/j.rsma.2017.12.005}},
volume = {{17}},
year = {{2018}},
}