A Coruña, Spain
A Coruña, Spain

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Gomez H.,Civil Engineering School | Colominas I.,Civil Engineering School | Navarrina F.,Civil Engineering School | Paris J.,Civil Engineering School | Casteleiro M.,Civil Engineering School
Archives of Computational Methods in Engineering | Year: 2010

Linear parabolic diffusion theories based on Fourier's or Fick's laws predict that disturbances can propagate at infinite speed. Although in some applications, the infinite speed paradox may be ignored, there are many other applications in which a theory that predicts propagation at finite speed is mandatory. As a consequence, several alternatives to the linear parabolic diffusion theory, that aim at avoiding the infinite speed paradox, have been proposed over the years. This paper is devoted to the mathematical, physical and numerical analysis of a hyperbolic convection-diffusion theory. © 2010 CIMNE, Barcelona, Spain.

Simarro G.,CSIC - Institute of Marine Sciences | Galan A.,Civil Engineering School | Orfila A.,CSIC - Mediterranean Institute for Advanced Studies
Coastal Engineering Journal | Year: 2015

A set of fully nonlinear Boussinessq-type equations with improved linear and nonlinear properties is considered for wave-current interaction analysis. These phase-resolving equations are so that the highest order of the derivatives is three. We implement a new source function for the wave-current generation within the domain, which allows to generate a wide range of wave-current conditions. The set of equations is solved using a fourth order explicit numerical scheme which semi-discretizes the equations in space and then integrates in time using an explicit Runge-Kutta scheme. A novel treatment of the boundaries, which uses radiative boundary conditions for the current and damps the waves, is used to avoid boundary reflections. Several validation tests are presented to demonstrate the capabilities of the new model equations for wave-current interaction. © 2015 World Scientific Publishing Company and Japan Society of Civil Engineers.

Delgado J.,Civil Engineering School | Juncosa R.,Civil Engineering School | Vazquez A.,Civil Engineering School | Fernandez S.,Civil Engineering School | And 3 more authors.
Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13 | Year: 2010

In December, 2007, after 30 years of operation, the Meirama mine finished the extraction of brown lignite. Flooding of the pit began by the end of March, 2008 and, since then, a large mine lake (-2 km 2 surface and up to 210 m depth) is being formed. To follow the flooding process, a comprehensive hydrochemical survey has been initiated. The data available to date show that the lake has developed a pronounced stratification that responds to the differences in the source of flooding waters and geochemical processes involving the progressive consumption of oxygen from the water column. At its present stage of evolution, Meirama is a meromictic lake structured in a thick monimolimnion (-50 m) that is evolving towards hypoxic conditions, beneath a mixolimnion that, within the studied two-year time frame, has experienced, at least, one winter turnover. © 2010 Taylor & Francis Group, London.

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