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Updated: Jun 4, 2026

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
07:15

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure

Published on: April 25, 2025

MODFLOW-Style parameters in underdetermined parameter estimation.

Marco D'Oria1, Michael N Fienen

  • 1DICATeA, University of Parma, Viale G.P. Usberti 181/A, 43124 Parma, Italy. marco.doria@unipr.it

Ground Water
|March 1, 2011
PubMed
Summary
This summary is machine-generated.

This study explores using MODFLOW-Style parameters in MODFLOW_2005 and MODFLOW_2005-Adjoint for defining aquifer properties. Optimizing parameter handling significantly improves computational efficiency for groundwater flow models.

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Last Updated: Jun 4, 2026

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
07:15

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure

Published on: April 25, 2025

Area of Science:

  • Hydrogeology
  • Computational Modeling
  • Numerical Simulation

Background:

  • Numerical codes like MODFLOW_2005 and MODFLOW_2005-Adjoint are essential for groundwater flow modeling.
  • Defining aquifer properties efficiently is crucial for accurate simulations and parameter estimation.
  • The Layer Property Flow package in MODFLOW utilizes parameters for variable definition.

Purpose of the Study:

  • To investigate the application and efficiency of MODFLOW-Style parameters within MODFLOW_2005 and MODFLOW_2005-Adjoint.
  • To identify methods for improving computational performance when using parameters for aquifer property definition.
  • To highlight the benefits of parameter-based input for overdetermined parameter estimation problems.

Main Methods:

  • Utilizing MODFLOW-Style parameters for defining variables in the Layer Property Flow package.
  • Analyzing the computational effort associated with parameter definition in MODFLOW_2005 and MODFLOW_2005-Adjoint.
  • Implementing optimizations by removing character string comparisons for parameter identification.
  • Exploring alternative formulations for distributed parameters defined through multiplication matrices.

Main Results:

  • Parameters are a valuable tool for representing aquifer properties in both MODFLOW_2005 and MODFLOW_2005-Adjoint.
  • Significant efficiency gains are achievable by optimizing parameter handling, particularly by removing character string comparisons.
  • An alternative formulation can mitigate efficiency degradation for distributed parameters.
  • The parameter approach simplifies data input for overdetermined parameter estimation problems.

Conclusions:

  • Optimizing the handling of MODFLOW-Style parameters leads to substantial improvements in computational efficiency for groundwater flow models.
  • The findings offer valuable insights for developers of numerical modeling codes, particularly those implemented in Fortran.
  • Effective parameterization is key to efficient and accurate groundwater resource management and simulation.