I'm aware of Hydrus and Netpath, but are there others? I am highly interested in water stable isotopes in variably saturated and non-equilibrium flow (double porosity/permeability). Any hints would be deeply appreciated.
For you I found the following
Multiphase Reactive Transport Modeling of Seasonal Infiltration Events and Stable Isotope Fractionation in Unsaturated Zone Pore Water and Vapor at the Hanford Site
Singleton, M. J., Sonnenthal, E. L., Conrad, M. E., DePaolo, D. J., Gee, G. W.Journal:Vadose Zone JournalYear:2004 Language:english
Multiphase Reactive Transport Modeling of Seasonal Infiltration Events and Stable Isotope Fractionation in Unsaturated Zone Pore Water and Vapor at the Hanford Site
Singleton, Michael J., Sonnenthal, Eric L., Conrad, Mark E., DePaolo, Donald J., Gee, Glendon W.Journal:Vadose Zone JournalYear:2004 Language:english
Stable Isotopes of Water Vapor in the Vadose Zone: A Review of Measurement and Modeling Techniques
Soderberg, Keir, Good, Stephen P., Wang, Lixin, Caylor, KellyJournal:Vadose Zone JournalYear:2013
Best Luck
stable Isotopes of Water Vapor in the Vadose Zone: A Review of Measurement and Modeling Techniques
Keir Soderberg et al..
First published: 07 September 2012
https://doi.org/10.2136/vzj2011.0165
Abstract
The stable isotopes of soil water vapor are useful tracers of hydrologic processes occurring in the vadose zone. The measurement of soil water vapor isotopic composition (δ18O, δ2H) is challenging due to difficulties inherent in sampling the vadose zone airspace in situ. Historically, these parameters have therefore been modeled, as opposed to directly measured, and typically soil water vapor is treated as being in isotopic equilibrium with liquid soil water. We reviewed the measurement and modeling of soil water vapor isotopes, with implications for studies of the soil–plant–atmosphere continuum. We also investigated a case study with in situ measurements from a soil profile in a semiarid African savanna, which supports the assumption of liquid–vapor isotopic equilibrium. A contribution of this work is to introduce the effect of soil water potential (Ѱ) on kinetic fractionation during soil evaporation within the Craig–Gordon modeling framework. Including Ѱ in these calculations becomes important for relatively dry soils (Ѱ
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