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Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Info e Commerciali Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
SEEP/W 2019
Lingua: Ing S.O.: Win
Produttore: GeoSlope
  ADALTA è Importatore Unico e Distributore Ufficiale per l'Italia per i prodotti GeoSlope


SEEP/W

 

Groundwater flow analysis

SEEP/W is a powerful finite element software product for modeling groundwater flow in porous media. SEEP/W can model simple saturated steady-state problems or sophisticated saturated / unsaturated transient analyses with atmospheric coupling at the ground surface.

SEEP/W can be applied to the analysis and design of geotechnical, civil, hydrogeological, geoenvironmental, and mining engineering projects.

Key Features

Boundary Conditions

SEEP/W supports a range of boundary condition options. Field data or user-specified functional relationships can be inputted to define hydrographs, reservoir fluctuations, rainfall cycles, vegetation effects, or land-climate interactions. 

Integration

Integration of SEEP/W with SLOPE/W makes it possible to analyze the stability of any natural or man-made system subject to transient changes in pore-water pressure.

Material Properties

Hydraulic conductivity and volumetric water content functions can be estimated using built-in functions. The estimation process requires only fundamental information. A saturated-only material model is also available.

Saturated/Unsaturated

The rigorous saturated/unsaturated formulation of SEEP/W means that even the most demanding flow problems, such as infiltration into dry soil or seepage through complex upstream tailings dams, can be analyzed with ease.

SEEP/W models almost any groundwater problem

Download GeoStudio to view GSZ files

Modeling Drains

This example illustrates how to model the effect of a drain in a seepage analysis. Modeling the effect of a drain with the specification of a total head type boundary condition at a point is more than adequate for small drains, and is a useful approach to get a first estimate of the flow quantities one might expect.

Download the GeoStudio data files
Read the analysis details

Perched Water Table

This example demonstrates how to use SEEP/W computed pore-pressures in a SLOPE/W stability analysis. The problem creates a perched watertable under long term net infiltration of precipitation. This perched condition can only be properly handled by directly using the SEEP/W results in SLOPE/W.

Download the GeoStudio data files
Read the analysis details

Seepage Through an Earth Dam

This example looks at a case of flow through an embankment dam. This case appears in most text books on seepage and consequently most SEEP/W users will have a good idea as to what the solution should look like. The example illustrates how easy it is to find the downstream seepage face when the dam is all one material.

Download the GeoStudio data files
Read the analysis details

Soil Cover Modeling - Hydraulic Response

This example illustrates the basic methodology for simulating soil-climate interactions and the corresponding water flows through an engineered soil cover system placed over a waste material.

Download the GeoStudio data files
Read the analysis details

SEEP/W's intuitive modeling workflow

Create a SEEP/W analysis and set up the problem workspace. Choose analysis type, including steady-state or transient, and define initial pore-water pressure conditions, convergence criteria, time duration and increments, and more.

Draw the regions in your domain using CAD-like drawing tools, including drawing polygon and circular regions, coordinate import, copy-paste geometric items, length and angle feedback, region splitting and merging, and direct keyboard entry of coordinates, lengths, and angles. Alternatively, import AutoCAD DWG or DXF files directly into GeoStudio to create your domain geometry.

Define the material properties for your analysis, assign them to regions on the domain, and then define your initial pore-water pressure conditions. Select from Saturated/Unsaturated and Saturated Only material models. Define hydraulic material functions using spline data point entry, Fredlund-Xing or van Genuchten methods. Define the initial pore-water pressure conditions for transient scenarios using results from other SEEP/W analyses, defined spatial functions or draw an initial water table.

Define hydraulic boundary conditions to simulate total head, pressure head, pore-water pressure, unit flux (q), total flux (Q) or climatic conditions. Time-varying conditions can also be modeled using total head, pressure head, unit flux (q) or total flux (Q) vs. time functions. The total head vs. volume function can also be used to simulate volume of water entering or exiting the domain via a specified boundary.

Open Draw Mesh Properties to refine the mesh drawn on the entire domain, or along specific geometric regions, lines or boundaries. Interface elements can also be created to simulate geosynthetic or other thin materials.

When your problem is completely defined, start the analysis process in the Solver Manager window. The Solver Manager displays the solution progress, allowing you to cancel or stop/restart if necessary. While the solution is in progress, you can look at preliminary results in the Results window.

When the Solver is finished, the Total Head contours are displayed, along with the location of phreatic surface, or zero pressure isoline, and flux vectors. You can display other contours of almost any parameter including pore-water pressure, material properties, water flow, and gradients, using the Draw Contours window. Contour legends and properties can also be modified. Labels can be added to contour lines for display in Results View. Flow paths can also be drawn in steady-state analyses.

Interactively select any node or gauss region to view result information, including total head, pore-water pressure, material properties, and more. Display plots of computed results over the x- or y-direction or create time-varying plots of results in transient analyses, such as total head, water flux, cumulative water volume, and more. Generate reports of the definition and results, and export into other applications such as Microsoft Excel for further analysis.

 

Complete Feature List
 

Integrated into the GeoStudio Suite

SEEP/W is integrated into the GeoStudio suite, and therefore has access to the GeoStudio features for creating your model, analyzing it, and viewing results.


Comprehensive Groundwater Flow Formulation

SEEP/W uses a finite element based formulation to analyze groundwater seepage and excess pore-water pressure dissipation problems within porous materials such as soil and rock. Its comprehensive formulation allows you to consider analyses ranging from simple, saturated steady-state problems to sophisticated, saturated/unsaturated time-dependent problems. SEEP/W can be applied to the analysis and design of geotechnical, civil, hydrogeological, geoenvironmental, and mining engineering projects.

The hydraulic conductivity of the soil is a function of the negative pore-water pressure in the unsaturated regions. The rate of change in water content is dependent on the pore-water pressure during transient processes. Hydraulic conductivity can be defined as anisotropic in two orthogonal directions.


Formulated for Saturated/Unsaturated Flow

SEEP/W is formulated for saturated and unsaturated groundwater flow, a feature that greatly broadens the range of problems that can be analyzed. In addition to traditional steady-state saturated flow analysis, the saturated/unsaturated formulation of SEEP/W makes it possible to analyze seepage as a function of time and to consider such problems as regional groundwater flow systems, de-watering of aquifer systems, flow through dams and levees, infiltration into deep unsaturated zones, or soil cover design. 


Typical Applications

SEEP/W can model almost any groundwater problem including:

  • Hydraulic response of a dam or levee to water level fluctuations
  • Changes in pore-water pressure conditions within earth slopes due to infiltration
  • Mounding of the groundwater table beneath water retention structures such as lagoons and tailings ponds
  • Effect of subsurface drains and injection wells
  • Drawdown of a water table due to pumping from an aquifer
  • Dewatering design for seepage into excavations
  • Infiltration, evaporation and transpiration from man-made or natural systems
  • Soil cover design for mine or municipal waste facilities
  • Goundwater flow in freezing and thawing soils (when integrated with TEMP/W)
  • Movement of solutes and gases in the subsurface (when integrated with CTRAN/W)

Get Converged Solutions for Difficult Problems

The partial differential equation for groundwater flow is often termed in the literature as one of the most mathematically difficult equations to solve due to the highly non-linear material properties. The SEEP/W Solver implements a rigorous convergence and under-relaxation scheme that makes it possible to solve even the most demanding unsaturated flow problems. Graphing tools are available during run-time to help you judge if convergence has been achieved.


Estimate Material Properties from Measured Data

The hydraulic conductivity and volumetric water content functions can be estimated using built-in functions. The estimation process requires only fundamental information such as soil classification, porosity, saturated hydraulic conductivity, or grain size distribution. A saturated-only material model is also available, allowing you to specify a single conductivity and water content value for saturated materials.


Comprehensive Range of Generalized Boundary Conditions

SEEP/W supports a comprehensive list of boundary condition options including total head, pressure head, flux rate, and flow rate. In keeping with the entire GeoStudio suite, SEEP/W makes broad use of generalized functions for boundary condition definition. As such, actual field data or user-specified functional relationships can be pasted into SEEP/W to define hydrographs, reservoir fluctuations, rainfall cycles, or anything imaginable. A modifier function can also be used to scale the functions as needed for site-specific analysis. 


Model Transient Flow Boundary Conditions

The total head versus volume boundary condition conveniently adjusts the total head based on the amount of recharge or discharge past a known area, making it possible to model transient flow into catchments, excavations, or other openings within the domain.


Land-Climate Interaction Boundary Condition

This boundary condition computes water transfers over the ground surface based on imported climate dataset(s), including evaporation, rainfall and snowmelt infiltration, and ponding and subsequent runoff.


Unit Gradient Boundary Condition

The unit gradient boundary condition makes it possible to model deep unsaturated systems for which defining the actual far-field boundary condition would be impractical. 


Rigorous Potential Seepage Face

The potential seepage face is probably one of the most used and most powerful boundary conditions in a groundwater flow analysis. The SEEP/W implementation is rigorous and efficient, with the user-interface and graphing functionality providing feedback on the behaviour of the boundary condition.


Model Root Water Uptake

Root water uptake is modeled in SEEP/W giving consideration to partitioning between actual evaporation and transpiration, plant stress factors, and root distribution.


Simulate Actual Evaporation

Actual Evaporation (AE) is only equal to Potential Evaporation (PE) when the soil is saturated. If the soil at the ground surface is not saturated, the AE rate can be much less than the PE rate. Wilson (1990, 1994) showed that the only way AE can be predicted correctly for all soil types and climatic conditions is to base the calculation on both the negative pore-water pressures and temperatures in the ground. Wilson modified the Penman (1948) method to make the actual evaporation rate dependent on the relative humidity of the soil and the air. The relative humidity in the soil can only be known if the soil temperature and water pressure are known and solved for simultaneously. To solve this complex set of equations, it is necessary to include vapor flow in the soil. SEEP/W meets all these requirements.


Convenient Initial Condition Definition

Initial conditions for transient analyses can be determined using a plethora of options including a piezometric line, spatial pressure head function, activation pore-water pressure, or results from another GeoStudio finite element analysis.


Initial Pore-Water Pressure for Activated Materials

Materials can be activated with a specified pore-water pressure for transient analyses, providing a convenient way to set the initial condition for entire regions in which the starting condition is nearly constant. 


Model in 1D, 2D, Axisymmetric or Plan View

SEEP/W includes analysis options for modelling pseudo three-dimensional problems such as radial flow to a well or relief well spacing in a hydraulic structure.


Powerful Graphing of Results

Graphing is critical for the interpretation of groundwater flow system. The powerful graphing options in GeoStudio make it possible to plot critical information in SEEP/W such as pore-water pressure profiles, total head versus time, material properties, water flux rates, and cumulative recharge and discharge at specified locations. All of this data can be exported or copy/pasted directly into spreadsheet software.


Visualize Flow Paths

Once the analysis is complete, you can interactively click on any part of the domain to visualize the flow path through this point.


Sensitivity Analysis with SEEP/W

A sensitivity analysis can be readily conducted with SEEP/W by cloning multiple analyses using the Analysis Tree and then making slight changes to each one.


Optimization and Calibration

SEEP/W can be paired with other software to conduct optimization/calibration of material properties.


Integration with SLOPE/W for Transient Stability Analyses

Integration of SEEP/W with SLOPE/W makes it possible to analyze the stability of any natural or man-made slope subject to transient changes in pore-water pressure, for example, due to infiltration or evaporation.


Integration with other GeoStudio Finite Element products

SEEP/W computed pore-water pressures can be used in other GeoStudio finite element products as initial conditions. You can also model coupled water and air flow using AIR/W, free-convection water transfer and forced-convection heat transfer using TEMP/W, and density-dependent water flow using CTRAN/W.





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