Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
Engineer Research and Development CenterUS Army Corpsof Engineers
SEEP2D & GMS:Simple Tools for Solving a Variety of
Seepage ProblemsSimple Tools for Solving a Variety of
Seepage Problems
Clarissa Hansen, ERDCClarissa Hansen, ERDC--CHLCHL
Fred Tracy, ERDCFred Tracy, ERDC--ITLITL
Eileen Glynn, ERDCEileen Glynn, ERDC--GSLGSL
Cary Talbot, ERDCCary Talbot, ERDC--CHLCHL
EarlEarl EdrisEdris, ERDC, ERDC--CHLCHL
Engineer Research and Development CenterUS Army Corpsof Engineers
SEEP2D
• 2-D finite element seepage model• Written by Fred Tracy, USACE-ERDC-ITL,
published 1973• Late 1970s – Dr. Tracy published groundbreaking
work on visualization and pre- and post-processing for FEM models.
• Simple, mesh-based interface for SEEP2D firstincluded in GMS v2.1, 1998.
• GMS v6.0 (2005) has a newly updated map-basedinterface
• 2-D finite element seepage model• Written by Fred Tracy, USACE-ERDC-ITL,
published 1973• Late 1970s – Dr. Tracy published groundbreaking
work on visualization and pre- and post-processing for FEM models.
• Simple, mesh-based interface for SEEP2D firstincluded in GMS v2.1, 1998.
• GMS v6.0 (2005) has a newly updated map-basedinterface
Engineer Research and Development CenterUS Army Corpsof Engineers
SEEP2D Applications
• Isotropic/anisotropic soilproperties
• Confined/unconfinedprofile models
• Saturated/unsaturatedflow for unconfined profilemodels
• Confined flow for plan(areal) models
• Flow simulation in thesaturated and unsaturatedzones
• Isotropic/anisotropic soilproperties
• Confined/unconfinedprofile models
• Saturated/unsaturatedflow for unconfined profilemodels
• Confined flow for plan(areal) models
• Flow simulation in thesaturated and unsaturatedzones
• Heterogeneous soilconditions
• Axisymmetric modelssuch as flow from a well
• Drains
• Heterogeneous soilconditions
• Axisymmetric modelssuch as flow from a well
• Drains
Engineer Research and Development CenterUS Army Corpsof Engineers
SEEP2D cannot simulate…
• Transient or time varying problems• Unconfined plan (areal) models• Transient or time varying problems• Unconfined plan (areal) models
Engineer Research and Development CenterUS Army Corpsof Engineers
Governing Equation
0)( =∇••∇ hK
0=∂∂+
∂∂
∂∂+
∂∂+
∂∂
∂∂
xhyxKy
hyyKyyhxyKx
hxxKx
h=total head (elevation + pressure head)
K=hydraulic conductivity
Engineer Research and Development CenterUS Army Corpsof Engineers
Department of Defense GroundwaterModeling System (GMS)
Engineer Research and Development CenterUS Army Corpsof Engineers
Groundwater Modeling System(GMS)
• 3D sub-surfacecharacterization forgroundwater modeling
• Supports 2D and 3D FEM,FDM, and analytic codes
• Incorporates advanced 3Dpost-processingvisualization tools
• 3D sub-surfacecharacterization forgroundwater modeling
• Supports 2D and 3D FEM,FDM, and analytic codes
• Incorporates advanced 3Dpost-processingvisualization tools
• Supported Models– MODFLOW2000– MODPATH– FEMWATER– WASH123D– ADH– SEEP2D– ART3D– SEAM3D– MT3DMS– RT3D– UTCHEM– MODAEM
• Supported Models– MODFLOW2000– MODPATH– FEMWATER– WASH123D– ADH– SEEP2D– ART3D– SEAM3D– MT3DMS– RT3D– UTCHEM– MODAEM
Engineer Research and Development CenterUS Army Corpsof Engineers
GMS Quick Facts
• First version released late 1994• Current version is v6.0• Developed by consortium of federal, academic
& private concerns• Graphical interface by EMRL at BYU• Over 700 Fed Gov’t users and thousands more
in over 90 countries
• First version released late 1994• Current version is v6.0• Developed by consortium of federal, academic
& private concerns• Graphical interface by EMRL at BYU• Over 700 Fed Gov’t users and thousands more
in over 90 countries
Engineer Research and Development CenterUS Army Corpsof Engineers
Obtaining GMS• Employees of DoD, DoE, NRC, EPA and their on-
site contractors can obtain free licenses for GMSat http://chl.erdc.usace.army.mil/gms.
• Groundwater Modeling Technical Support Centerat ERDC handles GMS user support and training.
• Others can purchase licenses by contactingEMS-I at http://www.ems-i.com.
• Employees of DoD, DoE, NRC, EPA and their on-site contractors can obtain free licenses for GMSat http://chl.erdc.usace.army.mil/gms.
• Groundwater Modeling Technical Support Centerat ERDC handles GMS user support and training.
• Others can purchase licenses by contactingEMS-I at http://www.ems-i.com.
The GMS download comes withthe SEEP2D executable andsource code, two SEEP2Dtutorials and the SEEP2Ddocumentation.
Engineer Research and Development CenterUS Army Corpsof Engineers
Setting Up a SEEP2DSimulation in GMS
1. Set up Conceptual Modela) Set up domainb) Assign soil propertiesc) Redistribute verticesd) Assign boundary conditions
2. Build Computational Mesh3. Map Boundary Conditions4. Run5. View Results
1. Set up Conceptual Modela) Set up domainb) Assign soil propertiesc) Redistribute verticesd) Assign boundary conditions
2. Build Computational Mesh3. Map Boundary Conditions4. Run5. View Results
Engineer Research and Development CenterUS Army Corpsof Engineers
Sample Problem
Engineer Research and Development CenterUS Army Corpsof Engineers
Import Image
Engineer Research and Development CenterUS Army Corpsof Engineers
Create Conceptual Model
Right mouse click
Engineer Research and Development CenterUS Army Corpsof Engineers
Right mouse click
Create Coverage
Engineer Research and Development CenterUS Army Corpsof Engineers
Set Up Domain
Engineer Research and Development CenterUS Army Corpsof Engineers
Create Material Types
Engineer Research and Development CenterUS Army Corpsof Engineers
Assign Material Properties
Engineer Research and Development CenterUS Army Corpsof Engineers
Double mouse click
Assign Materials to Polygons
Engineer Research and Development CenterUS Army Corpsof Engineers
Redistribute Vertices
NodesVertices
Arc
Engineer Research and Development CenterUS Army Corpsof Engineers
Redistribute Vertices
Engineer Research and Development CenterUS Army Corpsof Engineers
Right mouse click on arc
Redistribute Vertices
Engineer Research and Development CenterUS Army Corpsof Engineers
Assign Boundary Conditions
Specified head= 937.8 ft
Specified head= 913.0 ft
Exit FaceBoundary
Engineer Research and Development CenterUS Army Corpsof Engineers
Shift-select arcs
Assign Boundary Conditions
Engineer Research and Development CenterUS Army Corpsof Engineers
Shift-select nodes
Assign Boundary Conditions
Engineer Research and Development CenterUS Army Corpsof Engineers
Assign Boundary Conditions
Specified Head Specified Head
Exit Face
Engineer Research and Development CenterUS Army Corpsof Engineers
Right mouse click
Build Computational Mesh
Engineer Research and Development CenterUS Army Corpsof Engineers
Initialize SEEP2D Simulation
Engineer Research and Development CenterUS Army Corpsof Engineers
Right mouse click
Map Boundary Conditions
Engineer Research and Development CenterUS Army Corpsof Engineers
Save the Simulation
Engineer Research and Development CenterUS Army Corpsof Engineers
Run SEEP2D
Engineer Research and Development CenterUS Army Corpsof Engineers
View Results
Engineer Research and Development CenterUS Army Corpsof Engineers
Conclusion
• SEEP2D is a fast, simple tool for seepageanalysis.
• GMS provides a nice interface for setting up theproblem and assigning boundary conditions.
• GMS also provides multiple options for viewingand analyzing the results.
• Best of all… SEEP2D and GMS are free forfederal employees (DoD, DoE, EPA, NRC)
• SEEP2D is a fast, simple tool for seepageanalysis.
• GMS provides a nice interface for setting up theproblem and assigning boundary conditions.
• GMS also provides multiple options for viewingand analyzing the results.
• Best of all… SEEP2D and GMS are free forfederal employees (DoD, DoE, EPA, NRC)
Engineer Research and Development CenterUS Army Corpsof Engineers
Issues to Consider:
• Mesh resolution• How to handle the unsaturated zone:
– Linear Front– Van Genuchten parameters
• Mesh resolution• How to handle the unsaturated zone:
– Linear Front– Van Genuchten parameters
Engineer Research and Development CenterUS Army Corpsof Engineers
Mesh Resolution
Engineer Research and Development CenterUS Army Corpsof Engineers
Unsaturated Zone Flow
• Conductivities are lower than the saturated valueand can be tied to the pressure head.
• SEEP2D calculates Kr, relative conductivity, anduses the following equation to determine theconductivity at each node having a negativepressure head:– K = Ksat * Kr
• Conductivities are lower than the saturated valueand can be tied to the pressure head.
• SEEP2D calculates Kr, relative conductivity, anduses the following equation to determine theconductivity at each node having a negativepressure head:– K = Ksat * Kr
Engineer Research and Development CenterUS Army Corpsof Engineers
Unsaturated Zone Flow
• Two ways to determine Kr:– Van Genuchten Parameters
• User supplies α, n.• Estimated for several soil types in:
– Carsel, F. F. and R. S. Parrish. 1988. Developing jointprobability distributions of soil water retentioncharacteristics. Water Resources Research 24, no. 5:755-69.
– Linear Approximation• User supplies ho, Kro
• Two ways to determine Kr:– Van Genuchten Parameters
• User supplies α, n.• Estimated for several soil types in:
– Carsel, F. F. and R. S. Parrish. 1988. Developing jointprobability distributions of soil water retentioncharacteristics. Water Resources Research 24, no. 5:755-69.
– Linear Approximation• User supplies ho, Kro
Engineer Research and Development CenterUS Army Corpsof Engineers
Unsaturated Zone FlowSand
0
0.2
0.4
0.6
0.8
1
-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1
Pressure Head (ft)
Rela
tive
Cond
uctiv
ity, K
r
Van Genuchtenho = -0.27ho=-0.24
Engineer Research and Development CenterUS Army Corpsof Engineers
Unsaturated Zone FlowLoamy Sand
0
0.2
0.4
0.6
0.8
1
-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1
Pressure Head (ft)
Rela
tive
Cond
uctiv
ity, K
r
Van Genuchtenho = -0.28ho=-0.207
Engineer Research and Development CenterUS Army Corpsof Engineers
Loamy Sand – Van Genuchten
Engineer Research and Development CenterUS Army Corpsof Engineers
Loamy Sand – Linear, ho=-0.28
Engineer Research and Development CenterUS Army Corpsof Engineers
Loamy Sand – Linear, ho=-0.207
Engineer Research and Development CenterUS Army Corpsof Engineers
Conclusion
• SEEP2D is a fast, simple tool for seepageanalysis.
• GMS provides a nice interface for setting up theproblem and assigning boundary conditions.
• GMS also provides multiple options for viewingand analyzing the results.
• Best of all… SEEP2D and GMS are free forfederal employees (DoD, DoE, EPA, NRC)
• SEEP2D is a fast, simple tool for seepageanalysis.
• GMS provides a nice interface for setting up theproblem and assigning boundary conditions.
• GMS also provides multiple options for viewingand analyzing the results.
• Best of all… SEEP2D and GMS are free forfederal employees (DoD, DoE, EPA, NRC)
Engineer Research and Development CenterUS Army Corpsof Engineers
Contact Information
• Clarissa Hansen• (601)634-2102• Coastal & Hydraulics Laboratory, ERDC, USACE• [email protected]
• Clarissa Hansen• (601)634-2102• Coastal & Hydraulics Laboratory, ERDC, USACE• [email protected]