FIG. 17.

Snapshots of contaminant concentrations during the descending phase. [(a)–(d)] show the vertical views along line P₁ in Fig. 5, whereas [(e)–(h)] show top views. Panels labeled [(a) and (e)], [(b) and (f)], [(c) and (g)], and [(d) and (h)] correspond to 0, 9.3, 13.9, and 23.2 min after particle release cessation, respectively. The flow is from South (left) to North (right).