Simulation of syn-eruptive floods in the circumvesuvian plain (southern Italy) |
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Authors: | M Favalli M T Pareschi G Zanchetta |
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Institution: | (1) Istituto Nazionale di Geofisica e Vulcanologia, Via della Faggiola 32, 56126 Pisa, Italy;(2) Dipartimento di Scienze della Terra, University of Pisa, via S. Maria, 56126 Pisa, Italy |
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Abstract: | During explosive eruptions the deposition of fine-grained volcanic ash fallout reduces soil permeability, favouring runoff
of meteoric water and thus increasing the occurrence of catastrophic floods. A fully dynamic, two-dimensional model was used
to simulate flooding scenarios in the Vesuvian area following an explosive volcanic eruption. The highest risk occurs in the
catchment area of the Acerra-Nola Plain N and NE of Vesuvius. This plain has a population of 70,000 living in low-lying areas.
This catchment area is vulnerable to ash fall because it lies downwind of the dominant synoptic circulation and it lacks a
natural outflow toward the sea. Our numerical simulations predict dangerous scenarios, even in quiescent periods, during extreme
rain events (return periods of 200 years have been considered), and a significant increase in the extent of the flooded areas
due to renewed volcanic activity. Based on these simulations a hazard zonation has been proposed.
Editorial responsibility: A Woods |
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Keywords: | Vesuvius Flood Flood simulation Volcanic hazard Southern Italy Phreatomagmatic ash Explosive eruption |
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