Advanced Ocean Modelling: Using Open-Source Software

5.5 Exercise 22: Exchange Flow Through a Strait 137Fig. 5.9 Exercise 21. Snapshot of the distributions of Eulerian tracer (shading and contours) andthe flow field (arrows). Flow vectors are interpolated over 2 × 2gridcellsinteraction with the irregular coastline of Sakhalin and bathymetric variations. Somemeanders develop into isolated eddies of about 30 km in diameter. All eddies formedare cyclonic features of anti-clockwise rotation. This sign of relative vorticity andthe spatial scale of mesoscale eddies are in agreement with the ice-spiral patternshown in Fig. 5.7. Eddies are not stationary features. Instead of this, eddies arerapidly carried away by the simulated Soya Warm Current.5.4.6 Bathymetry CreationThe folder “Miscellaneous/Bathymetry for Exercise 21” on the book’s ftp site containsthe FORTRAN bathymetry creator, named “BathCreator.f95”, needed for thisexercise. The result is written to a file named “topo.dat” that is requires as inputfile for the FORTRAN simulation code. Included is also the SciLab script, called“Bath.sce” that creates Fig. 5.7.5.4.7 Additional Exercises for the ReaderRepeat this exercise with the same coastline configuration but uniform water depthof 100 m. Does this configuration also support eddy formation? Include bottom frictionand explore variations in the dynamic response.5.5 Exercise 22: Exchange Flow Through a Strait5.5.1 AimThe aim of this exercise is to study density-driven exchange flows through a straitthat connects ocean basins containing water of different densities.