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What happens when rain falls on desert soils ? An updated model provides answers

ScienceDaily (December 14, 2020 )

Titre : What happens when rain falls on desert soils ? An updated model provides answers

ScienceDaily (December 14, 2020 )

Résumé
Scientists have made important improvements to our understanding of how water moves through and gets stored in dry desert soils by refining an existing computer model.

Descriptif
The model, called HYDRUS-1D, simulates how water redistributes in a sandy desert soil based on precipitation and evaporation data. A first version of the model was developed by a previous DRI graduate student named Jelle Dijkema, but was not working well under conditions where soil moisture levels near the soil surface were very low.

To refine and expand the usefulness of Dijkema’s model, Luo analyzed data from DRI’s SEPHAS Lysimeter facility, located in Boulder City, Nev. Here, large, underground, soil-filled steel tanks have been installed over truck scales to allow researchers to study natural water gains and losses in a soil column under controlled conditions.

Using data from the lysimeters, Luo explored the use of several hydraulic equations to refine Dijkema’s model. The end result, which is described in the new paper, was an improved understanding and model of how moisture moves through and is stored in the upper layers of dry desert soils.

Story Source  : Desert Research Institute

Annonce (ScienceDaily)

Page publiée le 23 juin 2021