Revisiting open boundary conditions from the point of view of characteristic variables

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Energetics of Barotropic and Baroclinic Tides in the Monterey Bay Area (2012, background): “Rather than employ a partially-clamped condition (Blayo and Debreu 2005), we found that a clamped condition was suitable because the transient barotropic wave decays after two tidal cycles and little barotropic energy reflects off of the boundaries during the simulations.”
Two-way embedding algorithms: a review (2008, unknown): “One remedy is to compute the interfacial ﬂuxes using information along characteristics of the ﬂow (Part-Enander and Sjogreen 1994, and Blayo and Debreu 2005 for an interpretation of usual open boundary conditions in term of characteristic variables).”