Groundwater flow in the Venice lagoon and remediation of the Porto Marghera industrial area (Italy)

Beretta, Giovanni Pietro; Terrenghi, Jacopo

Groundwater flow in the Venice lagoon and remediation of the Porto Marghera industrial area (Italy) | Ecoulement d’eaux souterraines dans la lagune de Venise et assainissement de la zone industrielle de Porto Marghera (Italie) Flujo de agua subterránea en la laguna de Venecia y la remediación de la zona industrial de Porto Marghera (Italia) (意大利)威尼斯泻湖的地下水流及马尔盖拉港工业区的修复 Fluxo das águas subterrâneas na Lagoa de Veneza e remediação da área industrial do Porto Marghera (Itália)

2017

Beretta, Giovanni Pietro | Terrenghi, Jacopo

This study aims to determine the groundwater flow in a large area of the Venice (northeast Italy) lagoon that is under great anthropogenic pressure, which is influencing the regional flow in the surficial aquifer (about 30 m depth). The area presents several elements that condition the groundwater flow: extraction by means of drainage pumps and wells; tidal fluctuation; impermeable barriers that define part of the coastline, rivers and artificial channels; precipitation; recharge, etc. All the elements were studied separately, and then they were brought together in a numerical groundwater flow model to estimate the impact of each one. Identification of the impact of each element will help to optimise the characteristics of the Porto Marghera remediation systems. Longstanding industrial activity has had a strong impact on the soil and groundwater quality, and expensive and complex emergency remediation measures in problematic locations have been undertaken to ensure the continuity of industrial and maritime activities. The land reclamation and remediation works withdraw 56–74% of the water budget, while recharge from the river accounts for about 21–48% of the input. Only 21–42% of groundwater in the modelled area is derived from natural recharge sources, untouched by human activity. The drop of the piezometric level due to the realization of the upgradient impermeable barrier can be counteracted with the reduction of the pumping rate of the remediation systems.

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