Brief introduction

This file includes an Excel Macro code for executing "IsoRHEA2", an Isotope-incorporated model for Root-zone Hydrology coupled with Ecosystem and Atmosphere (IsoRHEA), Ver. 2, to simulate surface energy/water balance and soil water dynamics, which was originally developed by Yamanaka et al. (2017) and then modified by Adachi, Ono, and Yamanaka (2026); see "Citation" section below for full infomation of the literature.

The model is executed with shortcut keys "Ctrl + u" on the "Comp" sheet. Results are given in this sheet as well as in the sheets of "Iso" and "Iso2".

Settings of some parameters (indicated by yellow cells) can be changed at "Comp" sheet by users. Also, input data (indicated by green cells) should be given at sheets of "Comp" and "Iso".

License Agreement

This code is licensed under a Creative Commons Attribution 4.0 International License (CC-BY 4.0). To view a copy of this license, please visit http://creativecommons.org/licenses/by/4.0/. By downloading and using the code the user agrees to the terms and conditions of this license. Notwithstanding this free license, we ask users to refrain from redistributing the code in whole in its original format on other websites without the explicit written permission from the authors.

Sharing policy

Citation to the paper is adequate if you simply use this code. If you asked help for additional handling/editing of the code, or your research outcome highly depends on the product, the developer would request co-authorship.

Citation

IsoRHEA2

Adachi, I., C. Ono, and T. Yamanaka (2026): Isotopic shift in streamflow relative to precipitation over 13 years: fractionation versus selection effects. Hydrological Research Letters, 20, 52-59, doi:10.3178/hrl.25-00044.

IsoRHEA

Yamanaka, T., T. Kimura, X. Sun, H. Kato and Y. Onda (2017): Comparing root water uptake profile estimations from an isotope-calibrated mechanistic model and a mixing model. Hydrological Research Letters, 11, 161-167, doi:10.3178/hrl.11.161.

Application

Nakajima, K., I. Adachi, and T. Yamanaka (2026): Refining isotopic estimates of the evaporation-to-inflow ratio: The role of lake-atmosphere interactions. Journal of Hydrology, 672, 135361, doi:10.1016/j.jhydrol.2026.135361.