>>>> ARRIVAL (ANALYZE/RAW) (INCREMENT): threshold
all third-level commands in block > OBSERVATION
This command returns the first arrival time of a breakthrough curve, i.e., the time at which the values within a time window for the first time exceed a user-specified threshold value. The threshold parameter is either an absolute value or an INCREMENT above the first value in the time series (i.e., the first calibration point within the time window).
If the first value is greater than the threshold, the time of the first calibration point within the time window is returned. If the ivalues in the time series never exceed the threshold, the time of the last calibration point within the time window is returned. For all other cases, the first arrival time is calculated by linear interpolation between the last calibration point below and the first point above the threshold.
As data points, the user may either specify the first arrival time, or the RAW data of the breakthrough curve, which will be ANALYZEd using the same scheme as for the corresponding model output, as described above.
Both the analyzed and calculated breakthrough times are assigned to all calibration points within the time window; their weights are divided by the number of calibration points within the time window, i.e., the user needs to specify the weight that reflects the uncertainty of the single arrival-time residual.
>> MASS FRACTION
>>> ELEMENT: BH__0
>>>> ANNOTATION: Time of spike
>>>> COMPONENT : 3
>>>> ARRIVAL TIME, RAW, INCREMENT: 1.0E-3
>>>> DATA are on FILE: concentration.dat
>>>> WINDOW: 10.0 100.0 [DAYS]
>>>> DEVIATON: 1E-3