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Simulation Method for Variable Permeability of Delay Interbed Based on Stress Variation Principle.

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Summary
This summary is machine-generated.

This study enhances land subsidence simulation by improving the geostress variation method for compressible interbeds. The new approach prevents overcompaction, offering more accurate results than existing models.

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Area of Science:

  • Geosciences
  • Hydrogeology
  • Computational Modeling

Background:

  • Land subsidence simulation relies on modeling compressible interbeds.
  • MODFLOW's SUB and CSUB modules simulate interbeds, with CSUB offering a more physically reasonable geostress variation approach.
  • CSUB's geostress method has limitations in accounting for interbed thickness and hydraulic conductivity variations.

Purpose of the Study:

  • To improve the simulation accuracy of compressible delay interbeds using the geostress variation principle.
  • To address the limitations of existing CSUB methods regarding variable interbed properties.
  • To develop a more rigorous approach for land subsidence simulation.

Main Methods:

  • Modified the head diffusion equation solution for compressible interbeds based on geostress variation.
  • Incorporated the Kozeny-Carman equation to link hydraulic conductivity and porosity.
  • Included variations in discrete nodal cell thickness into the simulation.

Main Results:

  • The improved method was validated against CSUB using three test cases.
  • Significant discrepancies were observed between the new method and CSUB under substantial interbed compression.
  • The proposed method successfully prevented "overcompaction" in the interbed simulations.

Conclusions:

  • The enhanced simulation method provides a more physically rigorous approach for modeling compressible interbeds.
  • This improvement is crucial for accurate land subsidence simulations, especially during significant compression events.
  • The study offers a more reliable tool for hydrogeologists and engineers studying land subsidence.