| = | calendar date representing the actual starting time of the activity of the sources; |
| = | calendar date representing the starting time of the simulation for any particular candidate solution in the optimization model; |
| = | time lag between the first measurement of concentration and a candidate starting time for the source; |
| = | calendar date representing the first concentration measurement obtained from the site; |
| = | time interval between concentration measurements; |
| = | number of concentration measurements available at a given observation location; |
| = | total number of concentration measurement wells; |
| = | time interval between the starting time of the simulation and the starting time of the activity of source |
| = | seepage or linear pore water velocity; |
| = | volumetric flux of water per unit volume of aquifer representing sources; |
| = | concentration of the sources or sinks; |
| = | porosity of the porous medium; |
| = | chemical reaction term for each of the N species considered; |
| = | pollutant source fluxes; |
| = | absolute difference; |
| = | simulated concentration at observation location iob at time ts; |
| = | observed concentration measurement at observation location iob at time ta; |
| = | perturbed numerically simulated concentration value; |
| = | error term; |
| = | maximum deviation expressed as a percentage; |
| = | random fraction between −1 and +1; |