Description |
MSEEP simulates 2D stationary groundwater flow in a cross section of layered soil or in one phreatic aquifer, composed of different material. The soil structure in the vertical x-y plane can be composed of several soil layers divided by layer boundaries. Permeability in x- and y-directions has to be specified for each layer. Sheetpiles can also be defined. For a phreatic aquifer the soil structure in the horizontal x-z plane consists of one vertical layer with different material areas. On the geometry border the available boundary conditions are: closed boundary, constant discharge boundary, constant potential boundary and only for a cross section: phreatic or seepage boundary (with rain), phreatic or closed boundary, overtopping boundary. Within the geometry constant discharges or fixed potential can be specified in certain points. A built-in mesh generator creates an element mesh of iso-parametric triangles for the geometry. The element mesh can be refined locally by specifying rectangular refinement boxes. The finite element method is used to solve the differential equation of Laplace, which represents the stationary groundwater flow. A direct solution technique solves the set of equations. The final position of the phreatic surface(s) is found using an iterative process, in which each step the finite element mesh is adapted (cross section) or the transmissivity is recalculated (aquifer). If no internal nodes were specified with a constant discharge or a fixed potential, an extra calculation can be performed to determine the streamlines. The results of the calculations are presented as an output file with an echo of the input and the potentials and discharges of all the mesh nodes. Graphical output consists of the geometry with the soil layers and sheetpiles, boundary conditions, (numbered) element mesh, distorted element mesh, potential and/or stream iso-lines. The graphical output can be printed directly from the program to either an Epson printer or a HP-laser printer. It is also possible to generate a HPGL plotcode file. |