Lehrstuhl für Hydromechanik und Hydrosystemmodellierung

NUPUS - Teilprojekt "Evaporation-driven transport and precipitation of salts in porous media"

Gefördert von der Deutschen Forschungsgemeinschaft im Rahmen des Internationalen Graduiertenkollegs (ITRG 1938) "Non-linearities and Upscaling in Porous Media (NUPUS)" vom 01.02.2012 bis zum 31.12.2015

Projektbeschreibung

Degradation of the soil productivity due to salt accumulation (salinization) is a major concern in arid, semi-arid and coastal regions. Soil salinization is an old issue but encouraged irrigation practices have been rapidly increasing its intensity and magnitude in the past few decades. Studies have shown that excess of the irrigated water contributes significantly to evaporation from the bare soil surface and therefore to the salinization. In some parts of the world soil salinity has grown so acute that the agricultural lands have been abandoned.
Evaporation salinization is mainly influenced by interaction between the flow and transport processes in the atmosphere and the porous-medium. On the atmosphere side, wind velocity, air temperature and radiation have a strong impact on evaporation. Furthermore, turbulence causes air mixing, influences the vapor transport and creates a boundary layer at the soil-atmosphere interface which indeed influences evaporation. On the porous-medium side, dissolved salt is transported under the influence of viscous forces, capillary forces, gravitational forces and advective and diffusive fluxes. The water either directly evaporates from the water-filled pores or it is transported to air due to diffusive processes. Continuous evaporation promotes salt accumulation and precipitation resulting in soil salinization.
In the scope of this work we attempt to develop a model concept capable of handling flow, transport and precipitation processes related to evaporative salinization of an unsaturated porous-medium.

Poster

Leiter

Helmig, Rainer
Pop, Iuliu Sorin
Shokri, Nima

Stellvertreterin

Schmid, Karen Sophie

Bearbeiter

Jambhekar, Vishal Arun

Abteilung

LH2

Laufzeit

02/2012 - 12/2015

Finanzierung

Internationales Graduiertenkolleg NUPUS

Kontakt

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Lehrstuhl für Hydromechanik und Hydrosystem- modellierung

 

Anfahrt

Pfaffenwaldring 61, 70569 Stuttgart

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