190
7. Mathematical Models of Groundwater Quality
L Start J
~
I
1,~lo+ll.1
I
~
Estimate the concentration distribution C" at 1
~
Using the state equation
-
I
Calculate p and 11
I
t
Using the flow equation and
~
Calculate velocity distribution V
Darsy's law
~
I
Calculate the dispersion coefficient!2
I
~
rSolve the concentration distribution C,
dispersion equation
~
No
I
IIC,-CII
t Yes
Is the total simulated time up?
No
---I
1,=I,+ll.1
~
~ Yes
I End I
FIGURE 7.2. Flow chart for solving advection-dispersion model in the general case.
racy. We then have the solution at t + M. The flow chart in Figure 7.2 shows
the process of computation. Obviously, more computation efTort is required
in the general case than that in the tracer case. Fortunately, most practical
problems of groundwater pollution fall into the tracer case category. One
exception is the salt water intrusion problem, which should be taken as the
general ca se, because the salinity will significantly change the density and
viscosity of water.
7. Mathematical Models of Groundwater Quality
L Start J
~
I
1,~lo+ll.1
I
~
Estimate the concentration distribution C" at 1
~
Using the state equation
-
I
Calculate p and 11
I
t
Using the flow equation and
~
Calculate velocity distribution V
Darsy's law
~
I
Calculate the dispersion coefficient!2
I
~
rSolve the concentration distribution C,
dispersion equation
~
No
I
IIC,-CII
t Yes
Is the total simulated time up?
No
---I
1,=I,+ll.1
~
~ Yes
I End I
FIGURE 7.2. Flow chart for solving advection-dispersion model in the general case.
racy. We then have the solution at t + M. The flow chart in Figure 7.2 shows
the process of computation. Obviously, more computation efTort is required
in the general case than that in the tracer case. Fortunately, most practical
problems of groundwater pollution fall into the tracer case category. One
exception is the salt water intrusion problem, which should be taken as the
general ca se, because the salinity will significantly change the density and
viscosity of water.