GeoSed - Associazione Italiana per la Geologia del Sedimentario
Dipartimento di Scienze della Terra dell'Università di Siena
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53100 Siena
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Table of Contents


Vol. 9 - 2010

Vol. 8 - 2009

Vol. 7 - 2008
SP 1 - 2008

Vol. 6 - 2007
Vol. 5 - 2006
Vol. 4 - 2005
Vol. 3 - 2004
Vol. 2 - 2003
Vol. 1 - 2001-2002

Notes for Authors
(PDF - 80 kb)



GeoActa Special Publication 1 2008


Acquisto online

GeoActa
an international Journal of Earth Sciences


Marta Pavesi
Dipartimento di Scienze della Terra e Geologico-Ambientali, Università  di Bologna, Piazza di Porta S. Donato 1, 40126 Bologna, Italy. E-mail: geolmart@gmail.com

Influence of stratigraphy on vertical soil movements: The Mincio River avulsion


Volume 6, 2007, pages 59-71

PDF (1.8 Mb)
Abstract

The well-known Mincio River avulsion south of Mantua is still a controversial problem, and several hypotheses have been proposed in the last few decades to account for its origin. By comparing a soil deformation data-set obtained using interferometric SAR analysis with stratigraphic data from boreholes, this study provides an alternative interpretation, suggesting that the diversion took place in response to differential sediment compaction driven by the peculiar facies distribution in the subsurface of the Mantua area.

The analysis of vertical soil movements east of Mantua records higher subsidence rates than in the western sector. Detailed subsurface studies show a peculiar stratigraphic architecture in this area, with paucity of gravel bodies and a higher proportion of mud, which could have favoured the fluvial diversion, in response to differential sediment compaction. An opposite trend, toward relative rising, in the industrial area east of Mantua could be linked to a rebound effect due to anthropogenic influence, i.e. lowering of water pumping.

Keywords: River avulsion, Soil movement, Stratigraphy, SAR Interferometry, Mincio River