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University of Texas at El Paso (2019)

System Dynamic Model Of 1-Dimensional Unsaturated Water And Solute Transport For Predicting Salinity Stress In Crops

Poulose Thomas

Titre : System Dynamic Model Of 1-Dimensional Unsaturated Water And Solute Transport For Predicting Salinity Stress In Crops

Auteur : Poulose Thomas

Université de soutenance : University of Texas at El Paso

Grade : Master of Science (MS) 2019

Résumé partiel
There is a complex non-linear system dynamic between the water and salt transport in the unsaturated vadose zone where the salt transport and accumulation affect the water fluxes and vice versa. In addition, factors such as precipitation, transpiration, water infiltration and solute transport in the unsaturated zone of subsurface soil further complicate the processes involved. We have developed a system dynamics model for simulating the one-dimensional unsaturated water and solute transport along with root water uptake in the vadose zone. The model uses finite difference method for solving Richard’s equation with a sink term for water transport and root water uptake ; and advection-diffusion equation for solute transport. The stock-flows for water and solute transport is discretized into different soil layers from top until it leaches out into an end stock. The root water uptake, water and solute transport are interconnected using physically based formulations and empirical assumptions. The model predicts the impact on root water uptake due to water and salinity stress as a function of matric and osmotic potential. The model’s results were similar to the results from HYDRUS showing that the model is capable of predicting salinity and matric stress in crops and could be a useful tool for analyzing various geographical soil and crops.

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Page publiée le 27 mai 2021