8 
Dispersion Model, 
Ja ll var 
Fundamental :equations 
Numerical method 
Model region 
Grid resolution 
Horizontal grid 
distance 
Layer boundary 
Period of simulation 
Time step 
InDuE 
OQutvut. 
DHI 
Advection/Diffusion 
equation 
Lagrange’s formulation 
diffusion: Monte Carlo 
method, . 
Advection: linear in- 
terpolation of the 
currents at the par- 
tEicle position. 
North Sea 
48° N -— 59° 30° N, 
4° W = 14° E 
3-dimensional 
10 layers 
eirca 20 km 
gee circulation model 
see circulation model 
12 minutes 
A tidal period 
resolved into 
60 timesteps 
(inclusive of wind and 
density forcing) 
Concentration distri- 
butions of passive, 
conservative substances, 
soluble in water, - 
in the climatological 
mean 
1 
‚X; 
ln 
DD Un aD a Wa 
Advection equation 
Lagrange's formulation 
formulation 
Advection: linear 
interpolation of 
the currents at 
the particle 
position 
North Sea 
49° N = 61° N; 
4° W- 14° E 
2-dimensional 
1 layer 
circa 20 km 
from surface to 
bottom 
see eirculation model 
daily values of 
the vertically 
integrated 
Current 
3 hours 
Concentration dis- 
tributions of pas- 
give, conservative 
substances, solub- 
le in water, 
during the simula- 
tion period of 14 
years.