@phdthesis{
 title = {Downscaling large-scale Ocean-basin solutions in coastal tri-dimensional hydrodynamic models},
 type = {phdthesis},
 year = {2010},
 pages = {273},
 institution = {Universida de Técnica de Lisboa - Instituto Superior Técnico},
 id = {9d46e737-cc43-3f07-853d-76b989e6e2b3},
 created = {2018-05-24T11:34:17.165Z},
 file_attached = {true},
 profile_id = {b3012b7e-6b18-3e87-a6ca-1357ce23063d},
 group_id = {f84f96bc-73de-3c3e-befe-041dabceaf3c},
 last_modified = {2018-05-24T11:34:17.377Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 user_context = {PhD Thesis},
 folder_uuids = {72545780-098f-48fc-8989-0f38ca9f3e59},
 private_publication = {false},
 abstract = {The aim of this thesis is to evaluate the quality of open boundary conditions of regional Ocean models downscaled in large-scale Ocean basin solutions by calculating the Okubo-Weiss parameter, which qualifies the type of flow. The scope of the open boundary conditions evaluation encompasses schematic test-cases as well as realistic regional Ocean models. The test-cases consist in a gaussian elevation release, a freshwater cylin- der, a schematic upwelling situation (to be implemented) and regional Ocean models of Western Iberia and the bay of Biscay, both forced with realistic conditions. A two-level, one-way nesting experiment was considered. The idea is to provide an unbounded reference solution to compare with the nested model and to provide adequate external forcing when required. A shallow waters equations numerical model was developed for the schematic experiments, whereas the hydrodynamic model, MOHID, was used for the regional applications. It was found that systematic flow-type inversions tend to occur near the open boundaries, even in situations where the unbounded reference solution displays monotonic flow types at the same location. The Okubo-Weiss cri- terion is arguably found by this thesis to provide an objective measurement of the performance of the open-boundary condition. The downscaling methodology applied to the regional applications yields robust results, capable of sustaining an operational system for regional Ocean forecasts. i},
 bibtype = {phdthesis},
 author = {Riflet, G.F.}
}

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