Lagrangian transport of particles in Ria de Aveiro lagoon, Portugal

Abstract

Abstract.A two-dimensional vertically integrated hydrodynamic model coupled to a particle tracking model is applied to study the dispersion processes and residThe only dispersion process that is considered in this study is the advection, according to the main characterence time in Ria de Aveiro lagoon (Portugal).istics of the local hydrodynamic.The particle tracking model computes the particles position at each time step, using a fourth-order Runge-Kutta integration method. The dispersion of passive particles released along the lagoon and in critical areas are studied in this work. The residence time is also determined for the entire lagoon. The results show that the mixture between particles coming from different channels of the lagoon is negligible in a time scale higher than 2 tidal cycles. The residence time for the lagoon central area is about 2 days, revealing a strong marine influence in this area. At the upper reaches of the channels were found values higher than 2 weeks. Q

Numerical modelling of cohesive sediments transport in the Ria de Aveiro lagoon, Portugal

“…The Lagrangian circulation of the Ria de Aveiro has been studied (Dias, 2001;Dias et al, 2001) by integrating the velocity components of the currents, considering only the tidal forcing.…”

The water quality of the Ria de Aveiro lagoon, Portugal: From the observations to the implementation of a numerical model

“…The salinity is an important physical variable that allows a better understanding of the dynamic of the water quality variables at different locations of the lagoon. As pointed out by Dias et al (2001), Ria de Aveiro is dominated by tides, which influence reaches the extreme ends of the most important channels. These locations are generally characterised by rivers input and low salinity.…”

Application of a lagrangian transport model to organo-mineral aggregates within the Nazaré canyon

“…The application of lagrangian transport models linked to hydrodynamic models has a high potential to predict various environmental scenarios. At the western Iberian margin, lagrangian transport models have been applied to the Galician coast (Carracedo et al, 2006), Ria de Vigo (Huhn et al, 2012;Abascal et al, 2012), Rio Lima estuary (Vale and Dias, 2011), Ria de Aveiro lagoon (Dias et al, 2001),Óbidos lagoon (Malhadas et al, 2009) and Tagus estuary (Braunschweig et al, 2003). The operational model MOHID-PCOMS (MOdelação HIDrodinâmica Portuguese Coast Operational Modelling System) runs in full operational mode for the western Iberian coast with daily hydrodynamic and ecological results.…”