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Universität Heidelberg (2018)

Observation of Infiltration in sandy soils with GPR (Ground Penetrating Radar)

Hantschel, Lisa

Titre : Observation of Infiltration in sandy soils with GPR (Ground Penetrating Radar)

Beobachtung von Infiltrationsprozessen in sandigen Böden mit GPR

Auteur : Hantschel, Lisa

Université de soutenance : Universität Heidelberg

Grade : Doktor 2018

Résumé
Infiltration in sandy soils monitored with GPR This thesis investigates which details on infiltration processes are accessible in GPR (Ground Penetrating Radar) data and explores if hydraulic soil properties can be estimated from this data. Analysis of a number of numerical simulations shows appearance of different infiltration phenomena in radargrams. It is explored to which extent contained information are available for analysis. Results are applied to the radar data of an experiment consisting of a set of infiltration events on a test site with artificial sand layers. The main impact of the amount of infiltrated water on the infiltration process is observed. Small scale soil structures in the infiltration region produce a prominent signal in the radar data. On the basis of these conducted GPR measurements it is tested whether infiltration data in principle is suitable to estimate hydraulic soil properties with inverse modeling. The estimation agrees with estimations based on other experimental data if a sufficient large range of water content of the soil is covered. This gives new possibilities for areas with sandy soils and absent natural vegetation as it is typical for irrigated agricultural land. Here the evaluated method can be used to adjust irrigation to the hydraulic properties aiming to enable agriculture in arid and semi-arid regions with responsible handling of water resources.

Mots clés  : Infiltration, Terrestrische Systeme, GPR

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Page publiée le 11 janvier 2019