4 COMPARING MODELING APPROACHES FOR ...

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Michel Eric*[1], Finke Peter[2], Cornu Sophie[3]. [1]INRA ~ UMR1114 INRA-UAPV Environnement Mediterraneen & Modelisation des Agro-Hydrosystemes ...
S04.05a -4 COMPARING MODELING APPROACHES FOR CLAY MIGRATION

Michel Eric*[1], Finke Peter[2], Cornu Sophie[3] [1]

INRA ~ UMR1114 INRA-UAPV Environnement Mediterraneen & Modelisation des Agro-Hydrosystemes ~ Avignon ~ France [2]Ghent University ~ Geology and Soil Science ~ Gent ~ Belgium [3]INRA ~ UR1119 Geochimie des Sols et des Eaux ~ Aix-en-Provence ~ France

Operational models to simulate clay migration over pedogenesis (multi-millennium) timescales are rare, and utilize concepts for mobilization, transport and immobilization of colloidal matter that were developed and tested for applications at limited temporal extents only. Comparison of different concepts at both short and pedogenesis timescales is needed to evaluate the detail of process description needed at both scales. We compared the functional clay mobilization approach by Jarvis et al. (1999) to the mechanistic approach by Michel et al. (2010) by embedding both approaches in the SoilGen model (Finke, 2011). The models were compared with respect to the accuracy with which they could reproduce short time lab experiments as well as by their ability to produce a E-Bt horizon sequence in loess soils and the accuracy of simulated clay content profiles after 15000 years of soil formation. Finke, P.A. in press. Modeling the genesis of luvisols as a function of topographic position in loess parent material. Quaternary International. http://dx.doi.org/10.1016/j.quaint.2011.10.016 Jarvis, N.J., Villholth, K.G., Ulén, B. 1999. Modelling particle mobilization and leaching in macroporous soil. European Journal of Soil Science 50: 621632 Michel,E., Majdalani, S., Di-Pietro, L. 2010. How Differential Capillary Stresses Promote Particle Mobilization in Macroporous Soils: A Novel Conceptual Model. Vadose Zone J. 9:307-316

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