Groundwater Modeling – 2: Computer Implementation Groundwater Hydraulics Daene C. McKinney.
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Transcript of Groundwater Modeling – 2: Computer Implementation Groundwater Hydraulics Daene C. McKinney.
![Page 1: Groundwater Modeling – 2: Computer Implementation Groundwater Hydraulics Daene C. McKinney.](https://reader031.fdocuments.us/reader031/viewer/2022012400/56649dd05503460f94ac55e1/html5/thumbnails/1.jpg)
Groundwater Modeling – 2:Computer Implementation
Groundwater Hydraulics
Daene C. McKinney
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Groundwater Vistas• Groundwater Modeling
Environment– Graphic User Interface (GUI)
for MODFLOW and other models
– Imports a wide variety of files• MODFLOW data sets• ArcView shapefiles• Digitized map files (AutoCAD
DXF, Shapefiles, and SURFER)
• GroundwaterVistas is not MODFLOW (but includes it)
• MODFLOW has no Graphic User Interface (GUI)
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Groundwater Vistas Installation
• Download file: gv5final.zip from
– http://www.caee.utexas.edu/prof/mckinney/ce374l/Overheads/gv5final.zip
• Unzip gv5final.zip to get– gv5final.exe (a “setup” file)
• Run gv5final.exe to install – Groundwater Vistas version 5– Answer “yes” or “OK” to
everything
• Groundwater Vistas manuals installed in– C:\gwv5\manuals
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Unit System
• Use a consistent set of units for all data• Select a unit of length and time
– Hydraulic conductivity (K) in m/s– Pumping rates (Q) in m3/s– Length units in m– Elevations in m
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Example• Boundaries
– North & South: No-flow– East & West: Constant-head
• Layer 1 – unconfined (13 m)– Kh = 5x10-3 m/s
– Kv = 5x10-4 m/s
• Layer 2 – confined (5 m)– Kh = 1x10-3 m/s; Kv = 1x10-4 m/s
No-flow Boundary
No-flow Boundary
Co
nst
an
t H
ea
d B
ou
nd
ary
(h
= 9
m)
Co
nst
an
t H
ea
d B
ou
nd
ary
(h
= 8
m)
Pumping Well
60
0 m
600 mAdapted from Chiang, W-H and W. Kinzelbach, Processing Modflow: A Simulation System For Modeling Groundwater Flow and Pollution, 1996
Pumping Well
Layer 1
Layer 2
513
10 m
-3 m-8 m
N
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Create a New Model• Start the GV program• Select File New
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Create a New Model• Enter basic information
– 30 rows– 30 columns– Row spacing = 20 m– Column spacing = 20 m– Top of Layer 1 = 10 m– Bottom of Layer 1 = -3 m– Bottom of Layer 2 = -8 m
Press
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Model Grid
Elevation = +10 mElevation = -3 m
Elevation = -8
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Add Constant Head Boundary Conditions• Select: Layer 1• Select: BCs Constant Head Boundary • Select: BCs Insert Window• Hold left Mouse button and Drag cursor through
cells in Column 1• Set value to 9 m
Constant Head Boundary Cells(h = 9 m)
Top Layer - 1
Press OK
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Repeat for Boundary in Column 30• Select: Layer 1• Select: BCs Constant Head Boundary • Select: BCs Insert Window• Hold left Mouse button and Drag cursor
through cells in Column 30• Set value to 8 m Constant Head
Boundary Cells(h = 8 m)
Top Layer - 1
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Repeat for Layer 2• Select: Layer 2• Select: BCs Constant Head Boundary • Select: BCs Insert Window• Hold left Mouse button and Drag cursor
through cells in Columns 1 and 30• Set values to 9 and 8 m
Constant Head Boundary Cells(h = 8 m)
Bottom Layer - 2
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Add Hydraulic Conductivity• Select: Props Hydraulic Conductivity• Select: Property Values Database• Set up 2 zones:
– Layer 1• Kx = 5x10-3 m/s
• Ky = 5x10-3 m/s
• Kz = 5x10-4 m/s
– Layer 2• Kx= 1x10-3 m/s
• Ky = 1x10-3 m/s
• Kz = 1x10-4 m/s• Click OK
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Assign K to Layer 1• Select: Layer 1• Select: Props Hydraulic Conductivity• Select: Props Set Value or Zone Window• Start in upper right-hand corner and drag to select all cells in grid• Select: OK• Select: Zone Number 1• Select: OK
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Assign K to Layer 2• Select: Layer 2• Select: Props Hydraulic Conductivity• Select: Props Set Value or Zone Window• Start in upper right-hand corner and drag to select all cells in grid• Select: OK• Select: Zone Number 2• Select: OK
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Add Multi-Layer Well
• Well penetrates all layers• Total pumping rate for multilayer well is sum of pumping from
layers• Pumping for each layer (Qk) is proportional to layer
transmissivity (bK)
• For a total pumping rate of Qtotal = 0.02 m3/s– Q1 = 0.0185 m3/s
– Q2 = 0.0015 m3/s
2211 KbKb
KbQQ kktotalk
Pumping Well
Layer 1
Layer 2
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Add Well in Layer 1• Select: Layer 1• Select: BCs Well• Select: BCs Insert Single Cell• Use cursor to click on cell at Row 15, Col. 25• Enter “Flow Rate in Well” = - 0.0185 m3/s• Select: OK
Row 15, Column 25
Note Top Layer - 1
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Add Well in Layer 2• Select: Layer 2• Select: BCs Well• Select: BCs Insert Single Cell• Use cursor to click on cell at Row 15, Col. 25• Enter “Flow Rate in Well” = - 0.0015 m3/s• Select: OK
Row 15, Column 25
Note Top Layer - 1
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Create MODFLOW Dataset• Select: Model MODFLOW Package Options• Select: Time Units = seconds• Select: Length Units = meters
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Create MODFLOW Dataset• Select: Model MODFLOW Package Options• Select: Tab Initial Heads• Enter: 0 ft for both Layers
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Create MODFLOW Dataset• Select: Model MODFLOW Package Options• Select: Tab BCF-LPF• Select: Layer 1 as “Unconfined”• Select: Layer 2 as “Confined”
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Create MODFLOW Dataset• Select: Model MODFLOW Package Options• Select: Tab Recharge - ET• Select: Top Layer Only• Select: OK
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Run Simulation• Select: Calculator button• Select: Yes, Yes, Yes!
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Process Results• Select: Cell-by-cell flows
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Results• Select: Plot Contour
Parameters (Plan)• Set parameters to
achieve the display you like
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Set Display Options• Select: Plot What to display• Select: Display Color Flood of Head• Select: Display Legend • Select: OK
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Set Legend Options• Select: Plot Legend Options• Select: Contents• Select: Color Flood Scale• Select: Dry Cells• Select: Title• Select: Title Font = 10 bold• Select: Text Font = 10• Select: OK
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Results
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Results• Look for the file ‘Ex1.lst” in the directory that you specified for the “working
directory” (e.g., C:\gv5\models).• Look for the following table and make sure you get the same (or close) numbers