I want to combine the advective transport equation for two solutes such that
dC1(z)/dt=D(d2C1(z)/dz2)-v dC1(z)/dz + J1
and
dC2(z)/dt=D(d2C1(z)/dz2)-v dC2(z)/dz + J2
where C is the concentration in the fluid, t = time, z = distance, v = velcity, D = dispersion coefficient, and J is a...