Version MLU - Windows Application Software
MLU is a Windows Application for the Analysis of Aquifer Tests and the Design of Well Fields in Layered Systems
Program Characterization
MLU (Multi-Layer Unsteady state) can be used for drawdown calculations and inverse modeling of transient well flow (pumping tests analysis) in layered aquifer systems and stratified aquifers.
With MLU one can estimate selected aquifer parameters based on a best fit analytical solution to measured time-distance-drawdown data. The automatic curve-fitting algorithm computes optimized aquifer parameters and fitted drawdown results that are presented in graphs and ASCII-files.
Unlike other aquifer test analysis software, often supporting a wide variety of different solution types (e.g., Theis, Hantush, Neuman, Boulton, Papadopulos, Moench, Bouwer-Rice) for usually one and sometimes two aquifers, MLU is based on a single analytical solution technique for well flow that handles:
- Layered aquifer systems, i.e. multi-aquifer systems (aquifers and aquitards)
and single layered (stratified) aquifers, - Confined, leaky and delayed yield aquifer conditions,
- Effects of aquifer and aquitard storativities,
- One or more pumping or injection wells,
- Variable discharge for each well,
- Finite diameter well screens in any selection of aquifer layers,
- Well bore storage and skin effect for each pumping well,
- Delayed observation well response.
Theoretical background information on the developed and applied analytical solution techniques for multiple aquifer systems has been published in: Journal of Hydrology 90, p. 231-249 (1987) and 225: p. 1-18 and p. 19-44 (1999). You may contact the authors (hemker at microfem dot com) for a pdf of these publications. The applied non-linear regression technique is described in Ground Water (1985) 23, no.2, p. 247-253.
The MLU characteristics allow for all sorts of tests, including variable discharge tests, recovery tests, step-drawdown tests, complex tests in well fields and slug tests. It also handles partially-penetrating and large-diameter wells, bounded aquifers and double-porosity systems.
Hydrogeologists have found MLU to be very useful for quickly estimating aquifer properties such as layer-by-layer transmissivity, storativity, and vertical resistance/conductance based on aquifer testing data, and efficiently incorporating these properties into numerical groundwater flow models for advanced subsurface flow evaluations. As far as we know, MLU is the only Windows tool for evaluating aquifer response to pumping in a multi-layer aquifer system.
Product Information
MLU modeling features
- Saturated groundwater flow
- Multiple-aquifer systems and stratified aquifers
- Confined, leaky and unconfined conditions
- Multiple wells
- Multiple finite-diameter screens
- Well bore storage and skin
- Variable discharges
- Delayed observation well response
Input & Output
- Interactive data input
- ASCII model files
- Data exchange with spreadsheets
- Graphs of time-variant drawdown or head
- Graphs of time-variant aquifer discharge
- Background raster image maps
- Animated contour plots
- Clipboard bitmap output
- Vector-based meta-file output
- XYZ-file output of contour maps
- File output of computed heads of displayed time graphs
- Conversion to MicroFEM finite element model file
Program Capacities
- 80 aquifers (layers) and 81 aquitards
- 1000 pumping/injection wells
- 100 pumping periods per well
- 100 observation wells
- 1000 drawdowns per observation well
- 16 parameters to be optimized in one run
- User assigned names for all wells
Parameter optimization features
- Automated curve fitting based on Levenberg-Marquardt algorithm
- Lineair and log-transformed least squares solutions
- Individual and grouped parameters to be determined in one run
- Statistical data output includes standard deviations and correlation matrix
Documentation and Support
- Fully documented on-line Help
- Example data files for all kinds of test types
- MLU Users Guide
- MLU Tutorial
- Excellent customer support
Download the free LT-version of MLU for Windows. It is a fully functional, capacity-reduced version of MLU. It handles up to 2 aquifers and 3 aquitards, 2 pumping wells, 5 observation wells, while 6 parameters can be optimized in one run.
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