engleski

Improving tidal open boundary conditions for the Adriatic Sea numerical model

In this work we are improving tidal open boundary conditions (obc) for advanced finite different ROMS model by using simpler assimilative part of finite element model TRUXTON in an iterative way. Numerical simulations of ROMS model using obtained open boundary conditions exhibit better match to tidal gauge sea levels, as well as to the ADCP current observations. Namely, ROMS model was run for 200 days, after which we performed tidal analysis of sea level and calculated RMS against available 31 tide gauge station data. Improvement between base solution (model forced with baseline obc) and one with optimal one (obc from assimilation) is in range from 15% up to 194 % depending on tidal constituent. Further more, by using assimilation of higher values of sea level in the Northern Adriatic we have provided obc for 3 more tidal constituents, ending with 7 most important ones. Applied procedure is shown to be applicable to different range of numerical models no matter finite difference or finite elements/volumes.

tidal; boundary; conditions; numerical; model; Adriatic Sea

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