Preprints
https://doi.org/10.5194/hess-2022-422
https://doi.org/10.5194/hess-2022-422
 
16 Jan 2023
16 Jan 2023
Status: this preprint is currently under review for the journal HESS.

MOIST: a MATLAB-based fully coupled one-dimensional isotope and soil water transport model

Han Fu1, Eric J. Neil1, Huijie Li2, and Bingcheng Si1,2 Han Fu et al.
  • 1Soil Science Department, University of Saskatchewan, Saskatoon, S7N 5A8, Canada
  • 2College of Resources and Environmental Engineering, Ludong University, Yantai, Shandong Province, 264025, China

Abstract. Modeling water stable isotope transport in soil is crucial to sharpen our understanding of water cycles in terrestrial ecosystems. However, isotope and soil water transport are not fully coupled in current models. In this study, we developed MOIST: a MATLAB-based one-dimensional isotope and soil water transport model, a program that solves one-dimensional water, heat, and isotope transport equations simultaneously. Results showed that the MOIST model has good agreements to the theoretical tests and semi-analytical solutions of isotope transport under fixed boundary conditions. Furthermore, we validated the program with short- and long-term measurements from lysimeters studies. The overall Nash-Sutcliff efficiency coefficient (NSE) of soil water and deuterium (2H) transport for the short-term measurements are 0.66 and 0.69, respectively, with respective determine coefficient (R2) of 0.82 and 0.70, mean absolute error (MAE) of 0.02 m3 m-3 and 11.84 ‰. For the long-term lysimeter study, the overall NSE, R2, and MAE of simulated δ18O are 0.47, 0.49, and 0.92 ‰, respectively. These indices indicated the excellent performance of the MOIST model in simulating water flow and isotope transport in simplified ecosystems, suggesting a great potential of our program in promoting understandings of ecohydrological processes in terrestrial ecosystems.

Han Fu et al.

Status: open (until 13 Mar 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2022-422', Anonymous Referee #1, 03 Feb 2023 reply

Han Fu et al.

Model code and software

MOIST Han Fu, Bingcheng Si https://github.com/HAN-2/MOIST

Han Fu et al.

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Short summary
Current hydrological models segregate water and isotope transport within soil. Thus, MOIST, a MATLAB-based one-dimensional isotope and soil water transport model, was developed. Results indicated that MOIST had good performances on simulating transport of isotope and water within soil under theoretical and realistic conditions, even outperformed than HYDRUS-1D. Suggesting a great potential of MOIST in promoting understandings of ecohydrological processes in terrestrial ecosystems.