introduction visual modflow

7/26/2019 Introduction Visual Modflow

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INTRODUCTION

Dr.rer.nat. Thomas T. Putranto


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PROFESSIONAL APPLICATIO

Evaluating groundwater remediation systemsDelineating well capture zones for wellhead prot

Simulating natural attenuation of contaminatedgroundwater

Estimating the reductive dechlorination of TCE, DCE in groundwater

Determining exposure pathways for risk assessm


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MODEL DESIGN FEATURE

nteractive model display using plan, cross!sectional, and f

Standard point!and!click functionality for assigning model

mport #utoC#D $%dxf& 'les or (itmap image $%(mp& 'les fomaps

)otate and align the model grid over the site (ase map

*raphical grid design tools and automatic grid smoothing fmodel convergence

*rid Cell Elevation Editor for on!the!+y modi'cations to cel

mport varia(le layer surface elevations from #SC $,-,.&,$%grd& 'les

mport time schedules for transient (oundary conditions an

o(servation points


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SIMULATION CAPABILITIES


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Visualization using VMOD 3D-Ex

Create contour/color maps of model properties and simulation results

Present graphical summaries of glo(al and local mass (udgets

Create model cali(ration plots and statistical summaries including meana(solute mean error, standard deviation, and many more0

1ull control of map overlays ! save your overlay con'gurations and view overlays you re2uire0

Display "D pumping wells and o(servation wells )epresent soil property zones and (oundary conditions in "D

)ender high resolution "D volumetric contaminant plumes

Create irregular shaped cross!sections

"D pathlines with time markers

De'ne "D cut!away regions

#nimate se2uential degradation of contaminant plumes and save into 3%#for use in 5icrosoft PowerPoint presentations0


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The site is located near an airport 6ustoutside of 7aterloo%

The sur'cial geology at the site consistsof an upper sand and gravel a2uifer, alower sand and gravel a2uifer, and a clayand silt a2uitard separating the upperand lower a2uifers%

The relevant site features consist of a

plane refuelling area, a municipal watersupply well 'eld, and a discontinuousa2uitard zone% These features areillustrated in the following 'gure%

escription of the Example Model


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escription of the Example Model

The municipal well 'eld consists of two

wells%

The east well pumps at a constant rate of889 m"/day, while the west well pumps ata constant rate of :99 m"/day%

;ver the past ten years, airplane fuel hasperiodically (een spilled in the refuelling

area and natural in'ltration has produced aplume of contamination in the uppera2uifer%

This tutorial will guide you through thesteps necessary to (uild a groundwater+ow and contaminant transport model forthis site%


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7hen discussing the site, in plan view, the top ofthe site will (e designated as north, the (ottom ofthe site as south, the left as west, and the right aseast%

*roundwater +ow is from north to south $top to(ottom& in a three!layer system consisting of an

upper uncon'ned a2uifer, an intervening middlea2uitard, and a lower con'ned a2uifer, asillustrated in the following 'gure%

The upper a2uifer and lower a2uifers have ahydraulic conductivity of


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MODEL DEVELOPMENT STEP

5odule = ! Creating and De'ning a 1low 5 5odule < ! #ssigning Particles and TranspoParameters

5odule " ! )unning 4isual 5;D1>;7

5odule : ! ;utput 4isualization


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Mo#ul" I$ C!"ating an# D"%ining a Flo&

S"'tion ($ )"n"!ating a N"& Mo#"l


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Mo#ul" I$ C!"ating an# D"%ining a Flo&


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? @ Create model using (ase 5apAext, you must specify the location and the 'lename of the %D1 (ackground map%? BrowseAavigate to the tutorial directory $defaultcF45;DATFTutorial& and select the following 'le

? Sitemap%dxf? B;penAext, you will specify the num(er of rows,columns, and layers to (e used in the model% Enterthe following into the 5odel Domain section,

Aum(er of Columns $6& :9Aum(er of )ows $i& :9

Aum(er of >ayers $k& ".min 9.max =G

>ength mTime daysConductivity m/secondPumping )ate m"/day)echarge mm/year5ass Concentration mg/>


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? BCreate to accept these settings# Select 5odel )egion dialog (ox will appearprompting you to de'ne the extents of the modelarea% 4isual 5;D1>;7 will read the minimum andmaximum co!ordinates fro the site map$Sitemap%dxf& and suggest a default that is centredin the model domain% 4isual 5;D1>;7 now allowsthe user to rotate and align the model grid overthe site map, use local co!ordinates, and set theextents of the D1 map% f a (itmap was used as(ackground map, the image can (e geo!referencedand the grid can (e aligned on the (itmap as well%Type the following values over the num(ers shownon the screen


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S"'tion *$ R"%ining t+" Mo#"l )!i#y default the #dd *rid Edit option is selected% 5ove the mouse anywhere in ththat a highlighted vertical line follows the location of the mouse throughout the

This line may (e used to add a column at any location within the model domaingridlines at speci'ed intervals (y clicking on the )*HT 5;ISE ITT;A to (rin4ertical >ine dialog (ox as shown (elow%


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4isual 5;D1>;7 allows you to import varia(le layer elevations from surferfrom space delimited x, y, z #SC 'les% n this example, we will import an #'le to create a sloping ground surface topography and layers with varia(le ? Bmport Elevation from the left!hand menuThe following dialog (ox will appear

? BChoose 1ilename#n mport Surface dialog (ox will appear listing theavaila(le 3%#SC, 3%TT, and 3%-. 'les% The 'le youwill import for the ground surface elevations isairptJgs%asc% To select the ground surfacetopography 'le,?? airptJgs%asc

To accept the remaining default settings,? B;KThis will import a varia(le surface generally sloping from ;7 reads the x, y, z data from the 'le and usesan inverse!distance s2uared interpolation routine to assign(lock center elevations for the top of each cell in layer = using


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BChoose 1ilenameairptJ(=%asc to select theelevation data for the (ottom of layer =

Aow you will import the surface elevations for the(ottom of layer =%? Bmport Elevation

? mport (ottom elevation of >ayer = $the valuein (ox (y default is M=M& 5inimum >ayer Thickness9%L8? B;K to select the remaining default parametervalues#fter a few seconds the (ottom of layer = willappear with a varia(le layer surface% Aext you willimport the surface elevations for the (ottom oflayer


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B;K to select the remaining default parametervaluesThe (ottom of layer < will then appear with avaria(le layer surface% Aext you will import thesurface elevations for the (ottom of layer "%? Bmport Elevation from the left tool(arBChoose 1ilenameairptJ("%asc to select theelevation data for the (ottom of layer "

mport (ottom elevation of >ayer

>ayer "5inimum >ayer Thickness 9%L8

B;K to select the remaining default parametervalues

The (ottom of layer " will then appear with avaria(le layer surface%To o(tain a 'ner vertical discretization of the modelgrid, you will su(divide each of the layers%? BEdit *rid? BEdit >ayers5ove the mouse into the model cross!section% # deforming horizontal line will elevation within the model cross!section% To su(!divide a layer, move the line tvertical mid!point of layer = and press the left mouse (utton% # layer division w

location%To su(!divide the middle con'nin la er move the mouse such that the horizo


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? Split current layer into Mayers dialog (ox

The model cross!section should now consist of sixlayers and should appear similar to the following'gure when viewing column "9


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Section 3: Adding Wells

? B7ells from the top menu (ar? BPumping 7ells from the drop!down menu

The purpose of this section will (e to guide youthrough the steps necessary to assign pumpingwells to the model%

-ou will (e asked to save your data? B-es tocontinue;nce your model has (een saved, you will (etransferred to the 7ell nput screen% Aotice thatthe left menu options are new well!speci'c options%To start, zoom in on the area surrounding thesupply wells $lower right!hand section of the model

domain&%? B18 ! .oom n5ove the cursor to the upper left of the supplywells and click on the left mouse (utton% Thenstretch a (ox around the supply wells and clickagain to close the zoom window%To add a pumping well to your model,? B#dd 7ell

5ove the cursor to the west well and click on it% #Click in the text (ox la(elled 7ell Aame type Supply 7ell =


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To add a well screen interval, click once in thecolumn la(elled Screen ottom and enter thefollowing valuesScreen ottom $m&9%" NScreen Top $m& 8%9Aotice the well screen interval appears in the well

(ore on the right!hand side of the window%#lternatively you can graphically assign the wellscreen (y clicking the )*HT 5;ISE ITT;A onthe well (ore and choosing #dd 7ell Screen% Thenclick!and!drag the mouse where you want to addthe well screen%To enter the well pumping schedule, click the leftmouse (utton once inside the text (ox under the

column la(elled End $days& and enter the followinginformation%

End $days& L"99

)ate $m"/d& !:99


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? B;K to accept this well information%f you have failed to enter any re2uired data 4isual5;D1>;7 will prompt you to complete the ta(le atthis time%The next step is to assign the well parameters forthe second pumping well (y using a shortcut% This

will allow you to copy the characteristics from onewell to another location%? BCopy 7ell from the left tool(ar5ove the cursor on top of the west well and clickon it% Then move the cursor to the location of theeast well location and click again to copy the well%Aext you will edit the well information from thecopied well%

? BEdit 7ell from the left tool(arSelect the new east well (y clicking on the wellsym(ol%#n Edit 7ell dialog (ox will appear%Click and highlight the text in the text (ox la(elled7ell Aametype Supply 7ell ayer dialog (ox appearstype "? B;K-ou are now viewing the third layer of model $layer= is the top layer&% n this six layer model, layers "and : represent the a2uitard separating the upper

and lower a2uifers% The next step in this tutorial isto assign a lower hydraulic conductivity value tolayers " and :%The B#ssignB7indow function allows you to assigna diOerent hydraulic conductivity inside of arectangular window% Aow, assign a lower hydraulicconductivity to the a2uitard $layers " and :&%

? B#ssign? B7indow

5ove the mouse to the north!wgrid and click on the centre of tthe mouse to the south!east cothe centre of the cell% This creacovering the entire layer%#n #ssign K Property dialog (oxBAew $the whole grid will turn Enter the following a2uitard coClick on the Kx $m/s& text (ox afollowing values

Kx $m/s&

Ky $m/s&

Kz $m/s&

=e!=9 N

=e!=9 N

=e!== N

B;K to accept these valuesAoconductivity properties of laye

? BCopy from the left tool(a? B>ayer

# Copy dialog (ox will appear%

? Copy all properties? B>ayer : $this will highligh? B;K to copy the K Propert:%


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introduction visual modflow

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