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Influence of tide and waves on water renewal in Abidos Lagoon, Portugal

The role of oceanic tide, wind stress, freshwater river inflows, and waves in the long-term circulation and residence time in Abidos Lagoon is investigated using a sensitivity analysis carried out by means of a two-dimensional model. MOHID modeling system coupled to Steady-State Spectral Wave model...

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Published in:Ocean dynamics 2009-11, Vol.59 (5), p.41-55
Main Authors: Malhadas, Madalena S, Neves, Ramiro J, Leitao, Paulo C, Silva, A
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Language:English
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Neves, Ramiro J
Leitao, Paulo C
Silva, A
description The role of oceanic tide, wind stress, freshwater river inflows, and waves in the long-term circulation and residence time in Abidos Lagoon is investigated using a sensitivity analysis carried out by means of a two-dimensional model. MOHID modeling system coupled to Steady-State Spectral Wave model for simulate Abidos Lagoon circulation were implemented. For residence time calculus, a Lagrangian transport model was used. Tidal forcing is shown to be the dominant forcing, although storm waves must be considered to simulate accurately the long-term circulation. Tidal forcing enhances a spatial distribution in water residence time. Renewal time scales varies from values of 2 days in the near-ocean areas and 3 weeks in the inner areas. Freshwater river inflows decrease the residence time, while waves increase. In heavy rain periods, the water residence time decreases by about 40% in the upper lagoon. When wave forcing is considered, the residence time increases between 10% and 50% depending on lagoon area. The increase in residence time is explained by the sea level rise within lagoon (1 m above average lagoon sea level) during storm wave periods. Average residence time is 16 days for tidal forcing, 9 days when the rivers are included (wet period), and 18 days when the waves are considered.
doi_str_mv 10.1007/s10236-009-0240-3
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title Influence of tide and waves on water renewal in Abidos Lagoon, Portugal
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