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

Stoppe, Nina and Horn, Rainer (2018) Microstructural strength of tidal soils – a rheometric approach to develop pedotransfer functions. Open Access Journal of Hydrology and Hydromechanics, 66 (1). DOI 10.1515/johh-2017-0031.

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Supplementary data:


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. Homoge-
nized samples of Marshland soils from the riparian zone of the Elbe River (North Germany) were analyzed with ampli-
tude 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 influ-
ence of individual physicochemical factors varies depending on texture, the relevant features were identified taking com-
bined 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 re-
lationships between rheological and physicochemical parameters, pedotransfer functions (PTF) have been developed.

Document Type: Article
Keywords: Rheology; Deformation; Soil micromechanics; Structural stability; Structure degradation; Pedotransfer functions.
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1515/johh-2017-0031
ISSN: 0042-790X
Date Deposited: 18 Jan 2018 10:14
Last Modified: 23 Sep 2019 23:10
URI: http://oceanrep.geomar.de/id/eprint/41607

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