SMEW_SS

SMEW_SS is an extension of the SMEW model for simulating enhanced weathering processes. It incorporates the effects of soil structure and the mixing of added rock powder particles.

License

This repository builds upon the original SMEW model and is licensed under the Creative Commons Attribution–NonCommercial 4.0 International License (CC BY-NC 4.0). See License.txt for details.

Repository structure

• pyEW/
  Core ecohydrological and enhanced weathering model components.
  Includes a new Python file biogeochemSS.py that provides a numerical solver to incorporate the effects of soil structure and mixing of added rock powder particles, following https://doi.org/10.1029/2025WR041479

• Example.ipynb
  Example notebook demonstrating a typical SMEW model setup and run

• Example_SS.ipynb
  Example demonstrating model runs with soil pore structure and rock powder mixing for a given particle size distribution (input data is in Example_SS_Data directory), using the new biogeochemical solver biogeochem_balance_SS

• docs/
  Documentation for model inputs and example usage

  • User-defined input variables: docs/input_variables.md
  • Model output variables: docs/output_variables.md
  • Internal variables and constants (developer reference): docs/model_internal_variables.md

Getting started

1. Clone the repository
2. Install dependencies:

pip install -r requirements.txt

Contact

Shashank Kumar Anand
Email: shashankkumaranand@gmail.com

Publication

Anand, S. K., Bertagni, M., Aburto, F., & Calabrese, S. (2026). Soil structure and mixing controls on water‐rock contact: Implications for Enhanced weathering. Water Resources Research, 62, e2025WR041479. https://doi.org/10.1029/2025WR041479