Fig. 7;　The velocity vector around the sill top in the K₁ case after 0.875period, when a bottom intensified current over the sill top is produced.

Fig. 8;　The subsequent evolution of potential density (σ_θ) around the sill top in the K₁ case; after (a)1.125, (b)1.25, (c)1.375, (d)1.5periods. The contours are the same as in Fig. 6.

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