<abstract xmlns="http://www.w3.org/1999/xhtml"> Differences in soil stability, especially in visually comparable soils can occur due to microstructural processes and interactions. By investigating these microstructural processes with rheological investigations, it is possible to achieve a better understanding of soil behaviour from the mesoscale (soil aggregates) to macroscale (bulk soil). In this paper, a rheological investigation of the factors influencing microstructural stability of riparian soils was conducted. Homogenized samples of Marshland soils from the riparian zone of the Elbe River (North Germany) were analyzed with amplitude sweeps (AS) under controlled shear deformation in a modular compact rheometer MCR 300 (Anton Paar, Germany) at different matric potentials. A range physicochemical parameters were determined (texture, pH, organic matter, CaCO3 etc.) and these factors were used to parameterize pedotransfer functions. The results indicate a clear dependence of microstructural elasticity on texture and water content. Although the influence of individual physicochemical factors varies depending on texture, the relevant features were identified taking combined effects into account. Thus, stabilizing factors are: organic matter, calcium ions, CaCO3 and pedogenic iron oxides; whereas sodium ions and water content represent structurally unfavorable factors. Based on the determined statistical relationships between rheological and physicochemical parameters, pedotransfer functions (PTF) have been developed.</abstract>

Differences in soil stability, especially in visually comparable soils can occur due to microstructural processes and interactions. By investigating these microstructural processes with rheological investigations, it is possible to achieve a better understanding of soil behaviour from the mesoscale (soil aggregates) to macroscale (bulk soil). In this paper, a rheological investigation of the factors influencing microstructural stability of riparian soils was conducted. Homogenized samples of Marshland soils from the riparian zone of the Elbe River (North Germany) were analyzed with amplitude sweeps (AS) under controlled shear deformation in a modular compact rheometer MCR 300 (Anton Paar, Germany) at different matric potentials. A range physicochemical parameters were determined (texture, pH, organic matter, CaCO3 etc.) and these factors were used to parameterize pedotransfer functions. The results indicate a clear dependence of microstructural elasticity on texture and water content. Although the influence of individual physicochemical factors varies depending on texture, the relevant features were identified taking combined effects into account. Thus, stabilizing factors are: organic matter, calcium ions, CaCO3 and pedogenic iron oxides; whereas sodium ions and water content represent structurally unfavorable factors. Based on the determined statistical relationships between rheological and physicochemical parameters, pedotransfer functions (PTF) have been developed.

Microstructural strength of tidal soils – a rheometric approach to develop pedotransfer functions

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Differences in soil stability, especially in visually comparable soils can occur due to microstructural processes and interactions. By investigating these...

Microstructural strength of tidal soils – a rheometric approach to develop pedotransfer functions

Pubblicato online: 22 nov 2017

Pagine: 87 - 96

Ricevuto: 02 nov 2016

Accettato: 16 mag 2017

DOI: https://doi.org/10.1515/johh-2017-0031

Parole chiave
Rheology, Deformation, Soil micromechanics, Structural stability, Structure degradation, Pedotransfer functions

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Microstructural strength of tidal soils – a rheometric approach to develop pedotransfer functions

Pubblicato online: 22 nov 2017

Pagine: 87 - 96

Ricevuto: 02 nov 2016

Accettato: 16 mag 2017

DOI: https://doi.org/10.1515/johh-2017-0031

Parole chiaveRheology, Deformation, Soil micromechanics, Structural stability, Structure degradation, Pedotransfer functions

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Parole chiave
Rheology, Deformation, Soil micromechanics, Structural stability, Structure degradation, Pedotransfer functions