GMS:CLN Process: Difference between revisions

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{{MODFLOW Links}}
{{MODFLOW Links}}
{{Template:Version GMS 10.1}}
The Connected Linear Network (CLN) process was developed for MODFLOW-USG to model one dimensional connected features that are much smaller than a groundwater flow model's cells.<ref name="tm6-A45">{{citation
The CLN process is only supported by [[GMS:MODFLOW-USG|MODFLOW-USG]]. CLN input data can be imported from existing simulations. GMS also supports manual creation of input data for the Connected Linear Network (CLN) Process in MODFLOW-USG. Displaying the CLN data in the Graphics Window is not yet supported.
|last1=Panday
|first1=Sorab
|last2=Langevin
|first2=Christian D.
|last3=Niswonger
|first3=Richard G.
|last4=Ibaraki
|first4=Motomu
|last5=Hughes
|first5=Joseph D.
|title=MODFLOW-USG Version 1: An Unstructured Grid Version of MODFLOW for Simulation Groundwater Flow and Tightly Coupled Processes Using a Control Volume Finite-Difference Formulation: U.S. Geological Survey Techniques and Methods, Book 6, Chapter A45
|place=Reston, Virginia
|year=2013
|url=http://pubs.usgs.gov/tm/06/a45/pdf/tm6-A45.pdf}}</ref> The CLN Process can be used to replace multi-cell wells that would use the MNW1 or MNW2 package in other versions of MODFLOW.
 
==Conceptual Model==
 
A CLN well can be added to a [[GMS:MODFLOW Conceptual Model Approach|conceptual model]] by creating a point using the "Wells (CLN)" type. The geometry of the well screen can be set using the ''Use screen'' attribute for a single vertical screen.  Otherwise, the generated well nodes include the grid layers specified for the coverage by its default layer range. For transient models, the CLN well node IBOUND values are disabled until the first stress period with a non-zero flow rate.
 
==CLN Process Dialog==
 
The CLN process values can be edited in the ''CLN Process'' dialog reached through the ''MODLFOW'' | ''Optional Packages'' | '''CLN &ndash; Connected Linear Network''' menu command. The dialog contains tables that can be accessed by selecting a table from the list at the left of the dialog.
*ClnText
*SegmentNodes &ndash; The CLN process contains nodes that can be connected together. Each connected nodes have a unique ''ClnSegmentId'', and each node has a unique ''IFNO'' value.  
*JAConnections &ndash; Allows editing the connectivity of nodes similar to the SegmentNodes table.
*Nodes &ndash; This table allows data for CLN nodes to be edited and viewed including the starting head and IBOUND values for each node.
*GwConnections &ndash; This table shows the connections between the CLN process and nodes and the groundwater process cells. The IGWNOD column contains the cell ID of the connected groundwater node.
*ConduitTypes &ndash; This table shows the conduit types generated for each CLN node and the associated mapped values for FRAD and CONDUITK previously entered in the Map module.
*UnitNumbers
*TransientIBOUND &ndash; Edits changing IBOUND values in transient models. This table can be edited when cells become active and inactive.
 
A detailed description of CLN process input is available with the MODFLOW-USG documentation available at the USGS [http://water.usgs.gov/ogw/mfusg/ MODFLOW-USG website].
 
[[File:CLN Process.png|thumb|none|600 px|MODFLOW ''CLN Process'' dialog showing the ''Nodes'' options]]
 
[[File:MapShapefileToCLN.png|thumb|280 px|The ''Map Shapefile to CLN'' dialog]]
===Map Shapefile to CLN===
The Connected Linear Network (CLN) process was developed for MODFLOW-USG to have the ability to model complex one-dimensional connected features that are much smaller than a groundwater flow model’s cells. A three-dimensional arc shapefile can be used to store the geometry and attributes of such a linear network. Attributes can optionally be applied to the arcs of the shapefile.
 
{| class="wikitable"
|+'''Optional Shapefile Arc Attributes'''
!width="100" align="left"|Name
!width="250" align="left"|Description
!width="110" align="left"|Default Value
|-
|IFLIN||Flow equation||Nonlinear (0)
|-
|ICCWADI||CLN to CLN Vertical correction||Off (0)
|-
|ICGWADI||CLN to GW Vertical correction||Off (0)
|-
|IFCON||Connectivity equation||Leakance (2)
|-
|FSKIN||Skin leakance 1||1.0
|-
|FANISO||Skin leakance 2||1.0
|-
|FRAD||Conduit radius||1.0
|-
|CONDUITK||Conduit conductivity factor||1000000.0
|-
|IBOUND|| ||1
|-
|MAXNODELEN||Maximum CLN node length||0.0
|-
|}
 
Clicking the '''Map Shapefile to CLN''' button in the ''CLN Process'' dialog will first bring up a ''Select Arc Shapefile'' dialog. Once a shapefile has been selected, the ''Map Shapefile to CLN'' dialog will appear. The settings items in this dialog are used when attributes are not specified as arc attributes by the shapefile. The settings dialog includes some additional items. Arc points within the ''Duplicate Point Tolerance'' are snapped together and their CLN nodes are connected. By default, mapping a shapefile to CLN deletes the existing CLN data. When ''Append to existing CLN data'' is turned on the generated CLN data is appended to the existing data which can be useful when using CLN wells. With the final two settings, ''Generate CLN UGrid'' and ''Generate CLN-GW UGrid'', UGrids are generated which can be visualized in GMS for the generated CLN network and also the part of the CLN network that is connected to the groundwater model.
 
==CLN Wells Dialog==
 
The ''MODFLOW CLN Wells Package'' is similar to the [[GMS:WEL_Package|''WEL Package'']] dialog. It is reached through the ''MODFLOW'' | ''Optional Packages'' | '''CLN Wel &ndash; CLN Well''' menu command. It allows CLN well flow rates to be viewed and edited, and CLN wells can also be deleted. The ''Cell ID'' table column is the CLN Process node ID of the well.
[[File:CLN Wells.png|thumb|none|370 px|The ''MODFLOW CLN Wells Package'' dialog]]
 
==Notes==
{{reflist}}


==CLN Well Package==
The CLN Process supports wells assigned at CLN segments. In GMS these wells can be viewed and edited in the CLN WEL Package dialog. Creating and deleting CLN wells is not yet supported.


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Latest revision as of 19:36, 26 April 2017

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The Connected Linear Network (CLN) process was developed for MODFLOW-USG to model one dimensional connected features that are much smaller than a groundwater flow model's cells.[1] The CLN Process can be used to replace multi-cell wells that would use the MNW1 or MNW2 package in other versions of MODFLOW.

Conceptual Model

A CLN well can be added to a conceptual model by creating a point using the "Wells (CLN)" type. The geometry of the well screen can be set using the Use screen attribute for a single vertical screen. Otherwise, the generated well nodes include the grid layers specified for the coverage by its default layer range. For transient models, the CLN well node IBOUND values are disabled until the first stress period with a non-zero flow rate.

CLN Process Dialog

The CLN process values can be edited in the CLN Process dialog reached through the MODLFOW | Optional Packages | CLN – Connected Linear Network menu command. The dialog contains tables that can be accessed by selecting a table from the list at the left of the dialog.

  • ClnText
  • SegmentNodes – The CLN process contains nodes that can be connected together. Each connected nodes have a unique ClnSegmentId, and each node has a unique IFNO value.
  • JAConnections – Allows editing the connectivity of nodes similar to the SegmentNodes table.
  • Nodes – This table allows data for CLN nodes to be edited and viewed including the starting head and IBOUND values for each node.
  • GwConnections – This table shows the connections between the CLN process and nodes and the groundwater process cells. The IGWNOD column contains the cell ID of the connected groundwater node.
  • ConduitTypes – This table shows the conduit types generated for each CLN node and the associated mapped values for FRAD and CONDUITK previously entered in the Map module.
  • UnitNumbers
  • TransientIBOUND – Edits changing IBOUND values in transient models. This table can be edited when cells become active and inactive.

A detailed description of CLN process input is available with the MODFLOW-USG documentation available at the USGS MODFLOW-USG website.

MODFLOW CLN Process dialog showing the Nodes options
The Map Shapefile to CLN dialog

Map Shapefile to CLN

The Connected Linear Network (CLN) process was developed for MODFLOW-USG to have the ability to model complex one-dimensional connected features that are much smaller than a groundwater flow model’s cells. A three-dimensional arc shapefile can be used to store the geometry and attributes of such a linear network. Attributes can optionally be applied to the arcs of the shapefile.

Optional Shapefile Arc Attributes
Name Description Default Value
IFLIN Flow equation Nonlinear (0)
ICCWADI CLN to CLN Vertical correction Off (0)
ICGWADI CLN to GW Vertical correction Off (0)
IFCON Connectivity equation Leakance (2)
FSKIN Skin leakance 1 1.0
FANISO Skin leakance 2 1.0
FRAD Conduit radius 1.0
CONDUITK Conduit conductivity factor 1000000.0
IBOUND 1
MAXNODELEN Maximum CLN node length 0.0

Clicking the Map Shapefile to CLN button in the CLN Process dialog will first bring up a Select Arc Shapefile dialog. Once a shapefile has been selected, the Map Shapefile to CLN dialog will appear. The settings items in this dialog are used when attributes are not specified as arc attributes by the shapefile. The settings dialog includes some additional items. Arc points within the Duplicate Point Tolerance are snapped together and their CLN nodes are connected. By default, mapping a shapefile to CLN deletes the existing CLN data. When Append to existing CLN data is turned on the generated CLN data is appended to the existing data which can be useful when using CLN wells. With the final two settings, Generate CLN UGrid and Generate CLN-GW UGrid, UGrids are generated which can be visualized in GMS for the generated CLN network and also the part of the CLN network that is connected to the groundwater model.

CLN Wells Dialog

The MODFLOW CLN Wells Package is similar to the WEL Package dialog. It is reached through the MODFLOW | Optional Packages | CLN Wel – CLN Well menu command. It allows CLN well flow rates to be viewed and edited, and CLN wells can also be deleted. The Cell ID table column is the CLN Process node ID of the well.

The MODFLOW CLN Wells Package dialog

Notes

  1. ^ Panday, Sorab; Langevin, Christian D.; Niswonger, Richard G.; Ibaraki, Motomu; Hughes, Joseph D. (2013), MODFLOW-USG Version 1: An Unstructured Grid Version of MODFLOW for Simulation Groundwater Flow and Tightly Coupled Processes Using a Control Volume Finite-Difference Formulation: U.S. Geological Survey Techniques and Methods, Book 6, Chapter A45, Reston, Virginia, http://pubs.usgs.gov/tm/06/a45/pdf/tm6-A45.pdf 


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