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Online Guide to MODFLOW-2000

Navigation: Observation Process

ADV2 - Advective-Transport Observation Package

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Abbreviation in Name file

ADV2

Purpose

The Advective-Transport Observation input file is used to specify observations of advective transport

Documentation

Anderman, E.R. and Hill, M.C., 2001, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- Documentation of the ADVective-Transport observations (ADV2) Package: U.S. Geological Survey Open-File Report 01-54, 69p.

MODPATH-ADV_compatibility_3-2006.pdf

release.txt

ADV-porosity-parameters.pdf

Related Packages

Observation Process input files

Supported in

MODFLOW-2000

Other Notes

The ADV2 Package is compatible with some of the features in the Layer-Property Flow and Hydrogeologic-Unit Flow packages, but is not compatible with the Block-Centered Flow or Generalized Finite-Difference packages.  (The Generalized Finite-Difference Package is not included in MODFLOW-2000 through version 1.17.02.)

The ADV2 Package is compatible with the Layer-Property Flow (LPF) package (Harbaugh and others, 2000), but it only calculates sensitivities for interblock transmissivities calculated by using the harmonic mean and does not support the alternative calculation schemes. The ADV2 Package also is compatible with the Hydrogeologic-Unit Flow (HUF) package (Anderman and Hill, 2000), but it only tracks particles through the model layers, rather than through the individual hydrogeologic units, and it calculates sensitivities using the bulk conductances. The ADV2 Package is compatible with the Horizontal Flow Barrier package (Hsieh and Freckleton, 1993), as adapted for MODFLOW-2000 (see Harbaugh and others, 2000 or “readme” file) for both the LPF and HUF Packages.

Input Instructions

Input for the Advective-Transport Observation input file is read from a file that is specified with "ADV2" as the file type listed in the name file.

Data Set 0

[#Text]

Item 0 is optional -- “#” must be in column 1. Item 0 can be repeated multiple times.

Data Set 1

NPTH NLOC IOUTADV KTFLG  KTREV ADVSTP FSNK [IMPATHOUT IMPATHOFF]

If porosity is to be defined using parameters, Item 2 must be entered as shown below and followed by Items 2a. and 2b.

The capability to define some porosity values using parameters and others without using parameters is not provided. Thus, if parameters are used to define the porosity, then they must define porosity for all model cells and Quasi-3D confining beds. Conversely, if porosity is defined using layer arrays, then no porosity parameters can be defined.

Data Set 2 (with parameters)

PARAMETER NPADV IPFLG

Repeat Items 2a-2b for each parameter to be defined (that is, NPADV times).

Data Set 2a

[PARNAM PARTYP Parval NCLU]

Data Set 2b

[Layer Mltarr Zonarr IZ]

Each repetition of Item 2b is called a parameter cluster. Repeat Item 2b NCLU times.

If porosity is not to be defined using parameters, Item 2 must be entered as shown

Data Set 2 (without parameters)

PRST(NCOL,NROW)

Item 2 is read using the array-reading utility module U2DREL (Harbaugh and others, 2000, p. 86-88. Item 2 is repeated for each model layer and quasi-3D confining unit in the grid. Thus, the number of PRST arrays must equal the number of model layers plus the number of quasi-3D confining beds. These layer variables are read in sequence going down from the top of the system.

Items 3-4 are repeated as a group for each advective-transport path to be defined (that is, NPTH times).

Data Set 3

NPNT SLAY SROW SCOL  SLOFF SROFF SCOFF

Data Set 4

OBSNAM LAY ROW COL LOFF ROFF COFF  XSTAT IXSTAT YSTAT IYSTAT ZSTAT  IZSTAT TADV PLOT-SYMBOL

Item 4 is repeated for each advective-transport observation point to be defined along the path (that is, NPNT times).

Data Set 5

Items 6-7 are required if IOWTQAD>0.

Data Set 6

FMTIN IPRN

Data Set 7

WTQ(NTT2,NTT2) (format FMTIN)

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