Modeling of solute dynamics in the root zone

I will present two main research projects regarding solute dynamics in the root zone. The first project deals with the dynamics of solutes under stochastic forcing by rainfall. I will start by investigating a simple equation for the evolution of solute mass under unpredictable flushing events prompted by rainfall. I derive basic statistical properties for this solute, such as its steady-state probability density, the dynamics of its mean and variance, and risk of crossing critical thresholds. Then, I expand the model to include the coupled dynamics of soil water and two species of (reactive and non-reactive) nitrogen, also under stochastic forcing by rainfall. The second project deals with the dynamics of soil salinization and sodification. I present my modeling framework, and discuss the influence of basic feedbacks in the evolution of salt/sodium, with a special emphasis given to the reduction in hydraulic conductivity as a result of soil structure deterioration. I will conclude the talk with a discussion on the model's predictions with respect to irreversible salinization/sodification and regarding the reclamation of already deteriorated soils.


תאריך 4/03/2018 - 5/03/2018
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