Analysis Of Hydrodynamic And Transport
Phenomena In The ‘R´ıa De Arousa’: A Numerical
Model For High Environmental Impact Estuaries
Author(s)
F. Navarrina, I. Colominas, M. Casteleiro, L. Cueto-Felgueroso,
H. G´omez, J. Fe & A. Soage
Abstract
In this paper, a numerical model for the simulation of the hydrodynamic and of the
evolution of the salinity in shallow water estuaries is presented. The mathematical
model consists of two coupled systems of differential equations: the shallow
water hydrodynamic equations (that describe the evolution of the depth and of the
velocity field) and the shallow water advective-diffusive transport equation (that
describes the evolution of the salinity level). Some important issues that must be
taken into account are the effects of the tides (including that the seabed could be
exposed), the volume of fresh water provided by the rivers and the effects of the
winds. Thus, different types of boundary conditions are considered. The numerical
model proposed for solving this problem is a second order Taylor–Galerkin Finite
Element formulation. The proposed approach is applied to a real case: the analysis
of the possible effects of dredging Los Lombos del Ulla, a formation of sandbanks
in the Arousa Estuary (Galicia, Spain). A number of simulations have been carried
out to compare the actual salinity level with the predicted situation if the different
dredging options were executed. Some of the obtained results are presented and
discussed.
1 Background
Los Lombos del Ulla is a natural formation of sandbanks, lying downstream the
Ulla River, within the tidal Arousa Estuary (La Ra de Arousa) in Galicia (northwestern
region of SPAIN, EU). Figure 1 shows the whole estuary. The Ulla River
Keywords
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