Introd GroundwaterVistas

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Groundwater Modeling Computer Implementation

Transcript of Introd GroundwaterVistas

Page 1: Introd GroundwaterVistas

Groundwater ModelingComputer Implementation

Page 2: Introd GroundwaterVistas

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)

Page 3: Introd GroundwaterVistas

Installation

• Open the folder “Models” located in your CD

• Unzip gv6.zip to get

– gv6.exe (a “setup” file)

• Run gv6.exe to install

– Groundwater Vistas version 6, the last one

– Answer “yes” or “OK” to everything

• Groundwater Vistas manuals installed in

C:\gwv6\Documentation

www.groundwatermodels.com

Page 4: Introd GroundwaterVistas

Unit System

• Use a consistent set of units for all data

• Select a unit of length and time

– Hydraulic conductivity (K) in m/s or ft/s

– Pumping rates (Q) in m3/s ft3/s

– Length units in m or ft

– Elevations in m or ft

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Coordinate Systems

• Model coordinates

– relative to lower left corner of grid

• Origin (0,0) lower left corner of grid

• Opposite to grid numbering

• Grid origin = row #1, column #1

• Map coordinates

– Define base map

– Used well locations, etc.

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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

– Porosity = 0.25

• Layer 2 – confined (5 m)– Kh = 1x10-3 m/s; Kv = 1x10-4 m/s

– Porosity = 0.25

No-flow Boundary

No-flow Boundary

Con

sta

nt H

ea

d B

ou

ndary

(h =

9 m

)

Con

sta

nt H

ea

d B

ou

ndary

(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

51

3

10 m

-3 m

-8 m

N

Page 7: Introd GroundwaterVistas

Create a New Model

• Start the GV program

• Select File New

• 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

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Model Grid

Elevation = +10 m

Elevation = -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 mConstant 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= Ky = 5x10-3 m/s

• Kz = 5x10-4 m/s

– Layer 2

• Kx= 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 full thickness of cells• Well penetrates more than one layer • Total pumping rate for multilayer well is sum of pumping

from layers• Pumping for each layer (Qk) is proportional to layer

transmissivity

• For a total pumping rate of Qtotal = 0.02 m3/s– Q1 = 0.0185 m3/s – Q2 = 0.0015 m3/s

2211KbKb

KbQQ kk

totalk

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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

Page 17: Introd GroundwaterVistas

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 (1)

• Select: Model MODFLOW Packages

• Change: Root File = Ex1

• Select: OK

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Create MODFLOW Dataset (2)• Select: Model MODFLOW Package Options

• Select: Time Units = seconds

• Select: Length Units = meters

• Select: OK

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Create MODFLOW Dataset (3)• Select: Model MODFLOW Package Options

• Select: Tab Initial Heads

• Enter: 0 ft for both Layers

• Select: OK

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Create MODFLOW Dataset (3)

• Select: Model MODFLOW Package Options

• Select: Tab BCF-LPF

• Select: Layer 1 as “Unconfined”

• Select: Layer 2 as “Confined”

• Select: OK

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Create MODFLOW Dataset (4)

• 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

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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

Page 29: Introd GroundwaterVistas

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