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Supplements of Geografia Fisica e Dinamica Quaternaria
Volume IV - 2001

 

Illustrative Notes of the Geomorphological Map of Po Plain

BONDESAN M., GATTI M. & RUSSO P.

Movimenti verticali del suolo desunti dalle livellazioni I.G.M. – Vertical ground movements obtained from I.G.M.levelling surveys

Pages 141-148

Abstract

For proper integration with the Map of Relief, it was believed opportune to present simple) general documentation of the framework ofvertical ground movements which took place during the 20th century) recorded with repeated height determinations measured by means of spirit levellings of the I.G.M.. Chapter 14 integrates these data with those of local networks) and interprets the entire subsidence problem from the applicational viewpoint (environmental impact). The Po Plain is known to be characterizedby significant vertical movements due to the effects of neotectonics) the isostatic response of the crust to variations in surface loads (sedimentary deposits) sea water) and compaction of sediments (see also Chapter 14). In the latter case) the rates of volumetric reduction are obviously higher in the upper rather than lower levels) where compaction has already mainly completed. It is therefore evident that) today) natural subsidence variesfrom area to area. The speed ofmovements due to naturalpbenomena, evaluated according to the thickness of the Quaternary sediments) is generally quite slight (less than 0.3 mmly?ar) in the belt near the Apennine and mainly Alpine reliefs) and near the Ferrara ridge (Groppi & Veggianz: 1984)) whereas it is particularly high (more than 1 mm/year) in some specific areas. These include: an area along the terminal stretch of the river Oglio, the Po Delta) and the sector of the Romagna plain between Lugo, Ravenna and Cesenatico. The Po Plain also reveals artificial subsidence) the speed ofwhich is from 10 to 100 times faster. This type of subsidence is mainly found. …

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