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Supplements of Geografia Fisica e Dinamica Quaternaria
Volume VII - 2005


Proceedings of the Conferences “Mountains and Plains”


Alluvial plain formation during the late quaternari between the southern alpine margin and the lagoon of Venice (northern Italy) –Evoluzione tardoquaternaria della pianura alluvionale posta tra il margine alpino e la laguna di Venezia (Italia Settentrionale)

Pages 219-229


The geomorphology of the cent ral Veneto plain has been analysed using a high-r esoluti on DEM, remote sensing and field survey. Th e study area consists of three alluvial megafans: the Mont ebelluna megafan (Piave River , pre-LGM); the Nerv esa megafan (Piave River, LGM – Upper Holocene); the Bassano megafan (Brenta River, LGM). Th e gravelly, coneshape d, steep (0.8-004 %) Mont ebelluna megafan outcrops just in the piedmont sector, as its distal reaches are bu ried by the Bassano and Nervesa megafans . These lat ter extend from the Southern Alps piedmont to the lagoon of Venice. Within a distance of 10-15 km from the Prealpine foothills, their apical parts are cone-shaped and rather steep (0.6- OJ %), consisting mainly of gravels. Through a gradual transition , the distal part s become mark edly less steep (reaching values 0.1%) and articulated in systems of fluvial ridges and elongated depressions. The ridges are gener ally 1 km wide and several km long. The y are mainly composed of sandy depo sits, while the dep ressions are silty-clay. The most significant eros ive landforms are related to: i) the head trenching of the Bassano megafan , which prob ably too k place at the end of the LGM because of a disequilibrium between solid and liquid disc harges of the Brenta river, related to the de-glacia tion of the mo untain catchment; ii) the down cutting and later al erosio n of the eastern lobe of the Momebelluna megafan during the Upper Pleistocene and the Holocen e, due to the tectonic uplift of the piedmont sector between the Aviano and Sacile faults. Active tectonics at the buri ed Southern Alpine thrust from led to the fault ing of the apica l portions of the Momebelluna, Nervesa and Bassano megafans, with the formatio n of tectonic scarps . Geomorphological evidence of a south-west tectonic tilt ing of a relict alluvial surface is also detectable in the distal fringes of the Bassano megafan.

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