W2 Post Quick Guide (Rev03)
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Quick Guide for the
CE-QUAL-W2 Post Processor
W2_Post
July 2012 Updates June 2016
W2_Post
A post-processor for CE-QUAL-W2 Version3/4 that provides the user with a broad range of visualization and
analyses of the model results. W2_Post provides for rapid visualization and assessment of W2 model results.
W2_Post uses a binary file generated by the CE-QUAL-W2 (i.e. the “W2L” file extension) for all of its model data
analysis. No need to output multiple types of output from W2. The post-processor provides extensive model
calibration / measured data comparison tools and statistics. The following are summaries of each major type of
post-processing available.
1) Model Grid Visualizations
a) Plan View
i) Normal View (i.e. using model input angles and widths)
ii) Simple View (simplified block view of grid)
iii) Line View
b) Longitudinal Profiles by Branch
c) Segment Profiles
d) Cells colored by connection and type
e) Google Earth KML, metafile and bitmap outputs
2) Animations
a) Animations time interpolate model stored results (in the W2L file) to user specified interval to speed
up/slow down animations.
b) Compare up to four separate model runs within a single animation. Mix and match parameters.
c) Up to four parameters from a single run can be animated.
d) User control of min/max color ranges.
e) User control of axis formats and types (i.e. segment/layer labels or distance/elevation units)
3) Vertical Profiles
a) View profile of any segment at any time (@ W2L intervals) for any parameter.
b) Automatic comparison of model and measured data with various statistics.
c) Various output formats.
4) Contours
a) View any branch longitudinal profile for any constituent.
b) Rapidly scroll through time.
c) Color filled and/or line contours.
d) Branch/Longitudinal Profile calibration statistics.
e) Various output formats.
5) Time Series
a) Point and click interface to select cells to plot.
b) Get a time series of any cell (if inundated) for any parameters for all or some of the modeled times.
c) Wide range of graph formatting options.
d) Various output options.
6) Velocity Vectors
a) View 2D velocity patters for any branch/longitudinal profile.
b) Rapidly scroll through time.
c) Various arrows formatting options.
d) Various output formats.
7) 2D Plan View
a) View 2D plan view concentrations at:
i) A specified layer
ii) Top active layer for each segment
iii) Volume weighted average for each segment
b) Rapidly scroll through time.
c) Use real world coordinates
d) If the model is using UTM, then Google Earth KML export option is available
W2_Tool/W2_Post Specific Files
W2P
The “W2P” file is the extension used by the W2_Tool utilities to define and retain non-model specific
information and user interface settings. This file is optional for W2_Post, however, it is strongly recommended to
save your project and use it for loading your projects.
W2L
A binary file that W2 creates during the model run. The W2L file contains all of the data necessary to
post-process the model results. However, it does not contain the scales and formatting that, once set, streamlines
the post-processing.
Setting up the W2_Post Linkage
Run the W2Control preprocessor for W2.
Turn on the W2_Post Linkage and define the snapshot timing.
Define the W2L file name
Save the model, then
Run the Model
Run W2_Post
The default W2_Post executable file name: W2Tool_Post3.exe
The W2_Post main form:
Degray Reservoir Example
Roosevelt Reservoir Example
Grid – Plan View – Block View
Grid – Plan View – Normal View
Grid – Plan View – Normal View with Labeling
Grid – Longitudinal Profile
2D Velocity Vectors
Longitudinal Profile - Contours
Animate – Two Parameters, Same Branch
1) Open the W2L file desired
a) Each “File” tab on the W2_Post form can be animated on one screen. Only 4 total branch/parameter
combinations can be animate at the same time.
2) Select the branch for each file
3) Select the parameters for each branch.
4) Press “Animate”
Whatcom Reservoir Example
Output of grid to kml or Google Earth file
Enter
UTM
coordinates
for Easting
and
Westing;
these can
be obtained
from Google
Earth. You
must
choose
what
coordinate
to start your
grid. For
Lake
Roosevelt
the world
coordinates
are
WorldX=352
136.09375
WorldY=531
3519.5
You also
must set the
UTM zone.
For Lake
Roosevelt
this is
shown in
Google
Earth if you
set the x-y
coordinates
to UTM.
Calibration Data
Data file for
import
Fields
populated
after
reading in
the data file
Data file for
import
The data import format is as follows:
Vertical Profiles - Calibration Data: Date/Time Vertical Profiles - Calibration Data: Julian Date
File Contents
Line1: Text description of file contents (ignored by W2_Post)
Line2: A line containing the parameter numbers (from the W2 parameters being modeled) that
are included in this calibration file. Any number of parameters can be included, one
parameter per column.
Line3 and Line4: Description and units (ignored by W2_Post).
Column Definitions:
Br:
RM:
W2 model branch number
Distance upstream of the most downstream segment face of the
specified branch
Date/Time or Julian Date: A valid date time formatted field (must include time), or
A valid Julian date from the start date of the model (e.g. 2004-01-01)
Depth:
Depth of the measurement
Parameter
Measurement value corresponding to each depth. Each parameter in
a column. Use -999 to indicate missing values. All columns must be
filled.
Example Form showing the calibration file settings after loading the specified file (using “Load
File”).
Using the “Calib Stats” button on the main W2_Post form, the user will see the W2_Tool
Calibration Summary form. The user must select the parameter to compute then click on the
“Compute” button. W2_Post will then compute the profile statistics and summarize all of the
measured profiles in the summary, as seen below.
After computing the summary statistics, the user can view the profiles by clicking on the “Show
Profiles”. Eight profiles are shown per page. Plotting control is available using the “X Axis” and
elevation settings on the form. The profiles can be saved as metafiles using the “Export Plots”
button. An example is shown below.
Source Exif Data:
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