amanzi/ats: ATS Release 1.5.0

• Main Authors: Ethan Coon, Daniil Svyatsky, AJKhattak-NOAA, aatchley, Joe Beisman, Eugene Kikinzon, Bo Gao, David Moulton, Gianmarco Manzini, Konstantin Lipnikov, Rao Garimella, chonggang xu, Sergi Molins, Dylan Robert Harp, zexuanxu, saubhagya-gatech, El, Alexandra Hamm, Ilhan Özgen Xian, Julien Loiseau, Phong Le, Radhakrishna.B.L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2024
• Subjects: Arctic
• Online Access: https://doi.org/10.5281/zenodo.12629073

This release contains a few significant additions in process capability in ATS: A new transpiration reduction function (TRF) was added. In previous versions, transpiration was reduced in dry conditions by an empirical function that was a function of water potential (based on CLM 4.5 technical note). The downside of this method is that it ignored soil properties; in some collections of van Genuchten water retention models, the TRF would still allow transpiration when there was very little water available in the soil. This would result in very small time steps. The new model is a simpler for of including plant hydraulics, and computes a plant water potential; this model reduces transpiration in all soils as needed. New capabilities were added for managed water systems, including tile drains and evaluators to map tiles to drainage ditches. New relative permeability models for freezing soils were added to support Arctic hillslope simulations. Preferential snow distribution was recovered -- it existed in older versions, but was not maintained and not included in the previous few releases. Additionally, multiple bugs were fixed including in canopy evapotranspiration, and several evaluators were refactored to make them more flexible, particularly in splitting the radiation balance to be used in multiple configurations of surface energy.