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Record Search Query: ServiceParameters>MODELS>COMPONENT PROCESS MODELS

MODOPTIM: A General Optimization Program for Ground-Water Flow Model Calibration and Ground-Water Management with MODFLOW
Entry ID: USGS_MODOPTIM
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Summary
Abstract: MODOPTIM is a non-linear ground-water model calibration and management tool that simulates flow with MODFLOW-96 as a subroutine. A weighted sum-of-squares objective function defines optimal solutions for calibration and management problems. Water levels, discharges, water quality, subsidence, and pumping-lift costs are the five direct observation types that can be compared in MODOPTIM. Differences between direct observations of the same type can be compared to fit temporal changes and spatial gradients. Water levels in pumping wells, wellbore storage in the observation wells, and rotational translation of observation wells also can be compared. Negative and positive residuals can be weighted unequally so inequality constraints such as maximum chloride concentrations or minimum water levels can be incorporated in the objective function. Optimization parameters are defined with zones and parameter-weight matrices. Parameter change is estimated iteratively with a quasi-Newton algorithm and is constrained to a user-defined maximum parameter change per iteration. Parameters that are less sensitive than a user-defined threshold are not estimated. MODOPTIM facilitates testing more conceptual models by expediting calibration of each conceptual model. Examples of applying MODOPTIM to aquifer-test analysis, ground-water management, and parameter estimation problems are presented.

[Summary provided by the USGS.]

Related URL
Link: GET SERVICE > GET SOFTWARE PACKAGE
Description: Download the MODOPTIM program.

Link: VIEW RELATED INFORMATION
Description: Access the MODOPTIM documentation.
Service Citation
Originators: Keith J. Halford
Title: MODOPTIM: A General Optimization Program for Ground-Water Flow Model Calibration and Ground-Water Management with MODFLOW
Release_Date: 2006
Provider: U.S. Geological Survey
URL: http://pubs.usgs.gov/sir/2006/5009/
Access Constraints
None
Service Provider
Nevada Water Science Center, Water Resources Division U.S. Geological Survey, U.S. Department of the Interior

Service Provider Personnel
Name: KEITH HALFORD
Phone: 775-887-7614
Email: khalford at usgs.gov
Contact Address:
Nevada Water Science Center
2730 North Deer Run Road
City: Carson City
Province or State: Nevada
Postal Code: 89701
Country: USA
Distribution Media
Distribution_Media: Online
Distribution_Size: 28.3 MB
Fees: No fees
Personnel
KEITH HALFORD
Role: TECHNICAL CONTACT
Phone: 775-887-7614
Email: khalford at usgs.gov
Contact Address:
Nevada Water Science Center
2730 North Deer Run Road
City: Carson City
Province or State: Nevada
Postal Code: 89701
Country: USA

TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2012-02-06
SERF Last Revision Date: 2012-02-08
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