1. General Model Information

Name: Aquifer-Simulations-Model

Acronym: ASM

Main medium: terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,2D)
Main application:
Keywords: groundwater flow, groundwater transport, ASM, Aquifer-Simulations-Modelport, two-dimensional, education, aquifer, pollutant, wells, piezometer heads, hydraulic conductivity, finite difference numerics, anisotropy, rectangular grid, random-walk

Contact:

Prof. Wolfgang Kinzelbach,

IHW
Hydromech. Wasserwirtsch.
HIL G 37.3
ETH Hönggerberg
CH-8093 Zürich

Phone: ++41-(0)1- 6333066
Fax: ++41 - (0)1 - 6331061
email: kinzelbach@ihw.baum.ethz.ch

Author(s):

W. Kinzelbach, R. Rausch

Abstract:

ASM (Aquifer Simulation Model) is a horizontally or vertically, two-dimensional groundwater flow and transport model. The program offers the following options:

steady state/time varying flow modelling
homogeneous/heterogeneous aquifers
confined/unconfined (leaky) aquifers
isotropic/anisotropic aquifers with the restriction that the principal axes of the hydraulic conductivity/transmissivity tensor are parallel to the coordinate axes of the grid
pumping/infiltration wells with constant or time-varying rates
temporally and spatially variable groundwater recharge from precipitation
water balances for the total model area and user specified subareas
comparison of measured and computed piezometer heads
automatic calibration for steady-state flow fields using Marquardt\&Levenberg method
generation of stochastic hydraulic conductivity/transmissivity distributions
Pathline computation
computation of isochrones around wells
pollutant distributions developing after permanent or instantaneous pollutant injection
pollutant breakthrough curves at selected observation or pumping wells

The solution of the flow equation uses a finite difference method. The system equations can alternatively be solved with the method of preconditioned conjugate gradients (PCG) or the IADI-method (Iterative alternative direction implicit procedure).
Pathlines and isochrones are computed by Euler-integration. The interpolation of the velocity alternatively uses the methods by Prickett or Pollock. Solute transport simulation uses random walk method based on Fokker-Planck theory. Pathline and isochrone calculations as well as transport simulation are possible for steady state flow fields only.

II. Technical Information

II.1 Executables:

Operating System(s): DOS and MS Windows version available at ETH Zurich:
download from ASM Home Page
(Dos Version is also included in Kinzelbach W., Rausch R., 1995 (s. Ref.) )

II.2 Source-code:

Programming Language(s): Fortran/Basic
download from ASM Home Page

II.3 Manuals:

Kinzelbach W., Rausch R. 1995 (s. Ref.)

II.4 Data:

example data-sets included in Kinzelbach W., Rausch R. 1995(s. Ref.)

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Kinzelbach W., R. Rausch (1995): Grundwassermodellierung - Eine Einführung mit Übungen.
Gebrüder Borntraeger, Berlin, Stuttgart, 283 pp.

Kinzelbach W. (1986): Groundwater Modelling - An Introduction with sample programs in BASIC.- Developments in Water Science: 25, Elsevier, Amsterdam, 333 p.

Kinzelbach W. (1992): Numerische Methoden zur Modellierung des Transports von Schadstoffen im Grundwasser. R.Oldenburg, München, Wien, 343 p.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 16. 6. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:39 CEST 2002