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iMOD User Manual version 4.4 (html)


10.4Data Set 3: Timeseries (optional)

Data Set 3

Apply only whenever IIPF\(<\)\(>\)0 from Data Set 2
IPF_TS,IPFTYPE,IXCOL,IYCOL,ILCOL,IMCOL,IVCOL (all compulsory)

IPF_TS

Notification of an IPF filename that stores the location of measures to be monitored as time series throughout the simulation.

IPFTYPE

Type of the IPF file

1

For a steady-state simulation the 5 attributes within the given IPF should be (in this order):

X

x coordinate

Y

y coordinate

ILAY

Model layer identification

OBS

Observed value (OBS=0.0 if no observation is available)

VAR

variance of the measurement \(\sigma ^2 = \operatorname {Var}(X)\)
(VAR=1.0 if no observation is available)

After the simulation the given IPF is copied to the folder [OUTPUT-FOLDER]\[ipfname] and contains the additional records:

COMP

Computed values

DIFF

Difference (COMP-OBS)

DIFFW

Weighed difference (COMP-OBS)*\(\left (\sqrt {\sigma ^2}\right )^{-1}\)

2

For the transient simulation the attributes within the given IPF should be (in this order):

X

x coordinate

Y

y coordinate

ILAY

Model layer identification

After the simulation the given IPF is copied to the folder [OUTPUT-FOLDER]\[ipfname] and contains the additional record:

ID

Reference ID to the individual time series which are stored within the file [OUTPUT-FOLDER]\timeseries\location_[i].txt.

Whenever the IPF_TS consists of time series initially, those will be included in the final time series. Time series within the buffer zone (see Data Set 6) will be left out.

IXCOL

Specify the column number in the IPF file (IPF_TS) that is representative for the X-coordinate of the measurement.

IYCOL

Specify the column number in the IPF file (IPF_TS) that is representative for the Y-coordinate of the measurement.

ILCOL

Specify the column number in the IPF file (IPF_TS) that is representative for the layer identification of the measurement.

IMCOL

Specify the column number in the IPF file (IPF_TS) that is representative for the measurement value. Whenever the number of columns in the IPF file be less than 4, IMCOL=0 and no observations will be used.

IVCOL

Whenever the number of columns in the IPF file be less than 5, IMCOL=0 and no observations will be used.

\(>\)0

Specify the column number in the IPF file (IPF_TS) that is representative for the variance of the measurement \(\operatorname {Var}(X)\). The variance of a random variable \(X\) is its second central moment, the expected value of the squared deviation from the mean \(\mu = \text {E}[X]\), thus: \(\operatorname {Var}(X) = \operatorname {E}\left [(X - \mu )^2 \right ]\). This definition encompasses random variables that are discrete, continuous, neither, or mixed. The variance (\(\sigma ^2\)) can also be thought of as the covariance of a random variable with itself: \(\operatorname {Var}(X) = \operatorname {Cov}(X, X) = \sigma ^2\).

\(<\)0

Whenever IVCOL is negative (e.g. IVCOL=-5), it means that instead of variances (\(\sigma ^2\)), weight values \(w\) are entered. Weight values are computed as \(w=\left (\sqrt {\sigma ^2}\right )^{-1}\) .