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Geotechnics of Venice and Its Lagoon
Venice faces significant threats from tidal flooding due to the narrowing gap between land and sea levels, exacerbated by climate change-induced sea-level rise and subsidence. The historic city's preservation demands innovative geotechnical solutions, such as tilting gate foundations and drainage system improvements, particularly in vulnerable areas like Piazza San Marco. This work delves into the complex hydro-mechanical behavior of Venice's sensitive silts, offering a comprehensive analysis of environmental challenges and mitigation strategies essential for safeguarding this cultural heritage.
Is the future given? Cumulative impact of Climate change and MOSE closures on Venice and its lagoon.
A systematic analysis reveals that the MOSE flood barrier system, while effective at mitigating sea level rise impacts on Venice, significantly increases lagoon water renewal time and exacerbates temperature-related stresses under high-emission scenarios. Projections indicate that by 2100, under the RCP8.5 scenario, the lagoon could remain closed for about 260 days a year, with water temperatures exceeding 30°C for over four months, and more than 35% of the lagoon experiencing delayed water renewal beyond 20 days. However, these impacts are substantially less severe under the RCP4.5 scenario, highlighting the potential for combined global mitigation and local adaptation strategies to protect both Venice and its lagoon ecosystem. The study underscores the critical need for site-specific, carefully planned adaptation measures to safeguard this UNESCO World Heritage Site.
Early Diagenesis in Sediments of the Venice Lagoon (Italy) and Its Relationship to Hypoxia
A critical link between sediment diagenesis and hypoxia in the Venice Lagoon has been identified, with intense diagenetic activity potentially triggering and sustaining low-oxygen conditions during summer months. The study, spanning three years (2015–2017), found that high-intensity diagenetic zones could deplete oxygen to hypoxic levels within 5–18 days under stagnant conditions, a process exacerbated by climate-driven heatwaves. Sediments were categorized into intense and moderate diagenesis groups based on metrics like dissolved inorganic carbon production (2.8 vs. 1.0 mmol m⁻² d⁻¹) and sulfate consumption (1.6 vs. 0.4 mmol m⁻² d⁻¹). Porewater sulfide accumulation near the sediment-water interface further underscored the role of sediments in oxygen depletion, with implications for lagoon health under changing climate scenarios.
The UNESCO Site “Venice and Its Lagoon”: Cultural Heritage Protection Policies
Cultural heritage protection policies for Venice and its Lagoon are significantly challenged by social and anthropological factors, particularly in less-touristed areas with minor architecture. These pressures, stemming from transformations in construction, trade, housing, and historical practices, threaten the site's cultural identity and landscape integrity. The study highlights that effective mitigation requires targeted actions from municipal authorities and stakeholders to address these obstacles. It also examines recent guidelines developed by the Superintendence for Archaeology, Fine Arts and Landscape for Venice, which aim to balance preservation with contemporary needs while navigating complex socio-technical dynamics.
A procedure for the quantification of total iodine by inductively coupled plasma mass spectrometry, and its application to the determination of iodine in algae sampled in the lagoon of Venice
A novel procedure using inductively coupled plasma mass spectrometry (ICP-MS) was successfully developed to quantify total iodine levels, offering a precise method for biomonitoring. Applied to seaweeds from Venice's lagoon, the technique revealed significant iodine concentrations in these marine organisms, providing critical data on environmental iodine distribution and potential ecological impacts. The study highlights ICP-MS as a reliable tool for trace element analysis in complex matrices, with implications for monitoring water quality and biological health in coastal ecosystems.
Salinity and its variability in the Lagoon of Venice, 2000–2009
The Lagoon of Venice exhibits a stable, steady-state salinity distribution characterized by three distinct zones: a northern freshwater-influenced area with high tidal variability (salinity <28 PSU), a southern marine zone with low tidal variability (salinity >32 PSU), and an intermediate transition zone. This stability, supported by data from 13 stations spanning 2000–2009, indicates that salinity changes are primarily driven by rainfall events and tidal motion rather than intrinsic water composition shifts. The study confirms the lagoon's long-term (to 1961) equilibrium, fostering at least three separate ecosystems. Researchers analyzed monthly and bimonthly salinity data alongside semi-continuous 2009 measurements to validate these findings.
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