scholarly journals Coupled thermohydromechanical analysis of Venice lagoon salt marshes

2008 ◽  
Vol 44 (5) ◽  
Author(s):  
Simonetta Cola ◽  
Lorenzo Sanavia ◽  
Paolo Simonini ◽  
Bernhard A. Schrefler
Keyword(s):  
Salt Marshes ◽  
Venice Lagoon

scholarly journals Land Subsidence in Coastal Environments: Knowledge Advance in the Venice Coastland by TerraSAR-X PSI

2018 ◽  
Vol 10 (8) ◽  
pp. 1191 ◽  
Author(s):  
Luigi Tosi ◽  
Cristina Lio ◽  
Pietro Teatini ◽  
Tazio Strozzi
Keyword(s):  
Land Subsidence ◽  
Salt Marshes ◽  
Venice Lagoon ◽  
Time Interval ◽  
Persistent Scatterer Interferometry ◽  
Ground Movements ◽  
Driving Mechanisms ◽  
Very High Spatial Resolution ◽  
Under Construction ◽  
German Aerospace

The use of satellite SAR interferometric methods has significantly improved the monitoring of ground movements over the last decades, thus opening new possibilities for a more accurate interpretation of land subsidence and its driving mechanisms. TerraSAR-X has been extensively used to study land subsidence in the Venice Lagoon, Italy, with the aim of quantifying the natural and anthropogenic causes. In this paper, we review and update the main results achieved by three research projects supported by DLR AOs (German Aerospace Center Announcement of Opportunity) and conducted to test the capability of TerraSAR-X PSI (Persistent Scatterer Interferometry) to detect ground movements in the complex physiographic setting of the Venice transitional coastal environment. The investigations have been focused on the historical center of Venice, the lagoon inlets where the MoSE is under construction, salt marshes, and newly built-up areas in the littoral. PSI on stacks of stripmap TerraSAR-X images covering short- to long-time periods (i.e., the years 2008–2009, 2008–2011 and 2008–2013) has proven particularly effective to measure land subsidence in the Venice coastland. The very high spatial resolution (3 m) and the short repeat time interval (11 days) of the TerraSAR-X acquisitions make it possible to investigate ground movements with a detail unavailable in the past. The interferometric products, properly calibrated, allowed for a millimetric vertical accuracy of the land movements at both the regional and local scales, even for short-term analyses, i.e., spanning one year only. The new picture of the land movement resulted from processing TerraSAR-X images has significantly contributed to update the knowledge on the subsidence process at the Venice coast.

Venice lagoon salt marsh vulnerability and halophytic vegetation vertical migration in response to sea level rise

2020 ◽  
Author(s):  
Zhicheng Yang ◽  
Sonia Silvestri ◽  
Marco Marani ◽  
Andrea D’Alpaos
Keyword(s):  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Salt Marshes ◽  
Current Knowledge ◽  
Venice Lagoon ◽  
Sea Level Changes ◽  
Human Pressure ◽  
Sea Levels ◽  
Vegetation Species

<p>Salt marshes are biogeomorphic systems that provide important ecosystem services such as carbon sequestration and prevention of coastal erosion. These ecosystems are, however, threatened by increasing sea levels and human pressure. Improving current knowledge of salt-marsh response to changes in the environmental forcing is a key step to understand and predict salt-marsh evolution, especially under accelerated sea level rise scenarios and increasing human pressure. Towards this goal, we have analyzed field observations of marsh topographic changes and halophytic vegetation distribution with elevation collected over 20 years (between 2000 and 2019) in a representative marsh in the Venice lagoon (Italy).</p><p>Our results suggest that: 1) on average, marsh elevation with respect to local mean sea level decreased , (i.e. the surface accretion rate was lower than the rate of sea level rise); 2) elevational frequency distributions are characteristic for different halophytic vegetation species, highlighting different ecological realized niches that change in time; 3) although the preferential elevations at which different species have changed in time, the sequence of vegetation species with increasing soil elevation was preserved and simply shifted upward; 4) we observed different vegetation migration rates for the different species, suggesting that the migration process is species-specific. In particular, vegetation species colonizing marsh edges (Juncus and Inula) migrated faster facing to changes in sea levels than Limonium and Spartina , while Sarcocornia was characterized by delayed migration in response to sea level changes. These results bear significant implications for long-term biogeomorphic evolution of tidal environments.</p>

scholarly journals Biochemical characterization of some cyanobacterial strains from salt marshes of the Venice Lagoon

2013 ◽  
Vol 26 (1) ◽  
pp. 273-278
Author(s):  
A. A. Sfriso ◽  
D. Marchetto ◽  
M. Gallo ◽  
F. Baldi
Keyword(s):  
Salt Marshes ◽  
Biochemical Characterization ◽  
Venice Lagoon

Characterization of organic matter decomposition in the Venice Lagoon using the Tea Bag Index

2021 ◽  
Author(s):  
Alice Puppin ◽  
Marcella Roner ◽  
Alvise Finotello ◽  
Massimiliano Ghinassi ◽  
Laura Tommasini ◽  
...  
Keyword(s):  
Organic Matter ◽  
Salt Marsh ◽  
Sea Level ◽  
Salt Marshes ◽  
Litter Quality ◽  
Venice Lagoon ◽  
Organic Matter Decomposition ◽  
Tea Bag Index ◽  
Decomposition Processes ◽  
Surface Accretion

<p>Salt-marsh evolution importantly depends on complex feedbacks between hydrodynamic, morphological, and biological processes. These crucial ecogeomorphic structures support a diverse range of ecosystem services, including coastal protection and biodiversity increase. In addition, they are among the most carbon‐rich ecosystems on Earth, as their high primary production coupled with rapid surface accretion results into the ability to sequester atmospheric carbon at high rates. However, salt-marsh future is at risk today, due to the effects of climate changes and local anthropogenic disturbances, in particular sea-level rise and reduced fluvial sediment delivery to the coasts. The organic matter captured and stored by salt marshes results from the balance between inputs and outputs and may contribute to marsh surface accretion, which determines their ability to keep pace with sea-level rise. Therefore, a better understanding of the processes regulating organic matter dynamics on salt marshes is a critical step to elucidate their carbon sink potential and to address salt-marsh management and conservation issues. Toward this goal, we analysed organic matter decomposition processes within salt-marsh ecosystems by burying 712 commercially available tea bags within different marshes in the Venice Lagoon (Italy), following the Tea Bag Index protocol. The process provides the values of two key parameters: the decomposition rate (k) and litter stabilisation factor (S). Based on standardized litter bag experiments, the Tea Bag Index focuses on the effects of abiotic conditions, neglecting litter-quality influences. The mean values of the decomposition metrics from our analyses are in general consistent with previous results and indicate a quite fast decomposition of the organic matter with a remaining mass of about 34% of the initial labile mass after 90 days. We next explore the possible dependence of k and S on environmental drivers. Temperature showed the most significant relationship with decomposition processes, suggesting an organic-matter decay acceleration with warming temperature, in line with previous literature. Moreover, the statistical analysis indicated some significant trends of the decomposition rate also with surface elevation and distance from the marsh edge. This suggests that, at the marsh scale, higher and probably less frequently flooded sites are exposed to faster decomposition, likely due to greater oxygen availability enhancing microbial respiration. In conclusion, the organic matter decay we observed is rapid enough to consume all the labile material before it can be buried and stabilized, hence increased global temperatures may not have a significant effect in increasing organic matter decomposition in coastal marshes. Therefore, we argue that, at least in the short term, the remaining mass of the organic matter contributing to carbon sequestration and marsh accretion, strongly depends on the initial litter quality, recalcitrant or labile, which may differ considerably between different species and plant parts and may be affected by climate change effects.</p>

Salt-marshes as emergent novelties in the Venice Lagoon

2009 ◽  
Vol 220 (16) ◽  
pp. 1870-1873
Author(s):  
Giovanni Cecconi ◽  
Claudia Cerasuolo ◽  
Nadia Marchettini ◽  
Enzo Tiezzi
Keyword(s):  
Salt Marshes ◽  
Venice Lagoon

Understanding land subsidence in salt marshes of the Venice Lagoon from SAR Interferometry and ground-based investigations

2018 ◽  
Vol 205 ◽  
pp. 56-70 ◽  
Author(s):  
Cristina Da Lio ◽  
Pietro Teatini ◽  
Tazio Strozzi ◽  
Luigi Tosi
Keyword(s):  
Land Subsidence ◽  
Salt Marshes ◽  
Venice Lagoon ◽  
Sar Interferometry

Climate change and artificial barrier effects on the Venice Lagoon: Inundation dynamics of salt marshes and implications for halophytes distribution

2014 ◽  
Vol 100 ◽  
pp. 101-115 ◽  
Author(s):  
Debora Bellafiore ◽  
Michol Ghezzo ◽  
Davide Tagliapietra ◽  
Georg Umgiesser
Keyword(s):  
Climate Change ◽  
Salt Marshes ◽  
Venice Lagoon ◽  
Barrier Effects

Aggradation and lateral migration shaping geometry of a tidal point bar: An example from salt marshes of the Northern Venice Lagoon (Italy)

2016 ◽  
Vol 343 ◽  
pp. 141-155 ◽  
Author(s):  
Lara Brivio ◽  
Massimiliano Ghinassi ◽  
Andrea D'Alpaos ◽  
Alvise Finotello ◽  
Alessandro Fontana ◽  
...  
Keyword(s):  
Salt Marshes ◽  
Venice Lagoon ◽  
Lateral Migration ◽  
Point Bar
Sign in / Sign up

Export Citation Format

Share Document