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Projects of Prof. Dr. (apl) Jörg Bachmann

A pore network model of soil water repellency: Model implementation and experimental validation

 

Supervisor:

Prof. Dr. Andrea Carminati (Georg-August-Universität Göttingen) und Prof. Dr. Jörg Bachmann

Duration:

2017-

Brief description:

Soil water repellency has a big impact on soil quality: it reduces the water holding capacity and it enhances overland flow, soil erosion and preferential leaching of agrochemicals. Better understanding of the mechanisms controlling soil water repellency is therefore needed for the sustainable use of water and soil resources. Existing studies demonstrated that soil hydrophobicity is strongly related to two factors: soil organic matter and soil water content. The experiments indicated a threshold behaviour: above a critical water content soils with a given percentage of soil organic matter are wettable (Contact Angle90). The critical water content decreases with increasing soil organic content. Although there are empirical models that are able to effectively mimic this hydraulic behaviour, a mechanistic model that is able to predict occurrence of soil water repellency for varying soil properties is missing. Objective of this project is to implement and experimentally validate a pore-scale model that is capable to predict the occurrence of water repellency in soils of various texture, water content and soil organic content.

 

details

 

Impact of bacterial biomass on the surface wettability of soil particles under varying moisture conditions

 

Supervisor:

Dr. Marc-Oliver Göbel, Prof. Dr. Jörg Bachmann

Researcher:

Dr. Marc-Oliver Göbel

Duration:

2016-2019

Funded by:

Deutsche Forschungsgemeinschaft (DFG)

 

 

Research group 1806: "SubSOM - The forgotten part of carbon cycling: Organic matter storage and turnover" - Subproject 4: Micro-scaled Hydraulic Heterogeneity in Subsoils

 

Supervisor:

Prof. Dr. Jörg Bachmann

Researcher:

Jiem Krüger

Duration:

2013-2017

Brief description:

The main subject of this project is to determine if physical constrains could explain low turnover rates of organic carbon in subsoils. Combining the information from physical structure of the soil (local bulk density, macropore strucuture, aggregation, texture gradients) with surface properties of particles or aggregate surfaces should result in a comprehensive set of physical important parameters and its relevance for an enforcing effect on the hydraulic heterogeneity of the subsoil flow system during wetting and drying. Pore space heterogeneity will be measured via x-ray radiography in flow cells. Interdisciplinary cooperation within the research program is realized by using these flow cell samples to match the special patterns of physical, chemical and biological factors like enzyme activities and spatial distribution of texture, organic carbon and iron oxide content using IR mapping.

 

 

Untersuchung der physikochemischen und mechanischen Eigenschaften von vulkanischen Ascheböden in Südchile und der Konsequenzen für die daraus resultierende Erodibilität

 

Supervisor:

Prof. Dr. Jörg Bachmann

Researcher:

Jiem Krüger

Duration:

2010-2013

Funded by:

Deutsche Forschungsgemeinschaft (DFG)