Dt hydrogr Z 40. 1987. H.3. Klein, Benthic storms 
9K 
The crosses in Fig 8 and 9 mark the position of a \irtual point source; at each time step, 
i e. e\er\ 60 minutes, one virtual particle is released. Figs, 8 and 9 show the streak lines 
after 20 days (480 particles released). A streak line is the current location of fluid particles, 
all of which passed through a fixed point in space (i. e. the source) at some previous time 
(Streeter [1961]). The Figures are like a picture of a smoke plume leaving a stack: one 
has no infoimation about the paths of the particles, one sees their final positions only. 
Particles leaving the polygon arc lost, they cannot re-enter it due to the lack of information 
about the velocity outside the polygon The numbers of released and lost particles are given 
in the plots. 
START. 6.10.1303 20 DAYS START. 10 12 1363 20 OfltS 
START. 6.10.1383 20 DAYS START. 10 12 1383 20 DAYS 
START. 6.10 1303 20 DAYS START. 10 1 2 1363 20 DAI'S 
Fig S Simulation of a point source in 
(A) 200 m. (B) 7Ü m. and (C) lllma.b 
The simulation runs from Oct 6 until Oct 25 
Fm 9. Simulation of a point source in 
(A) 2(H) m. (B) 70 m, and (C) 10 m a b. 
The simulation runs from Dee. 10 until Dec 29