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In numerical ocean models coast lines change the direction from one grid cellto its neighbor and the value for viscosity is set to be as small as possible.Therefore, model simulations are not converged with resolution and boundaryseparation points differ in essential properties from flow separation incontinuous flow fields. In this paper, we investigate the quality of therepresentation of boundary separation points in global ocean models. To thisend, we apply well established criteria for boundary separation within anidealized ocean model setup. We investigate an eddy-resolving as well as asteady test case with idealized and unstructured coast lines in a shallow watermodel that is based on a finite element discretization method.  The results show that well established criteria for separation fail to detectboundary separation points due to an insufficient representation of ocean flowsalong free-slip boundaries. Along no-slip boundaries, most separation criteriaprovide adequate results. However, a very sophisticated criterion based ondynamical system theory reveals that the representation of boundary separationis limited for these flows as well. We conclude that the representation ofboundary separation points in numerical ocean models is not satisfying. Thiswill have an impact on the separation of boundary currents in global oceanmodels.

A study on boundary separation in an idealized ocean model