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:

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. 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 Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
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: 26 Mar 2019 09:13
URI: http://oceanrep.geomar.de/id/eprint/41607

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