Influence of distributary channels on sediment and organic matter supply in event-dominated coastal margins: the Po prodelta as a study case

Tesi, Tommaso; Miserocchi, Stefano; Goñi, Miguel A.; Turchetto, M.; Langone, Leonardo; Lazzari, Amelia De; Albertazzi, S.; Correggiari, A.

doi:10.5194/bg-8-365-2011

Cited by 37 publications

(35 citation statements)

References 46 publications

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“…Moreover, flood events are difficult to observe in situ; as with ship-based activities, it is seldom possible to reach river mouths while autonomous vehicles are not operating in shallow waters or in highdensity gradients (Hetland, 2005;Devlin and Schaeffelke, 2009;Tesi et al, 2011). However, observations from instrumented sites or coastal observatories such as AAOT provide detailed information on a large array of variables but do not provide a sufficient spatial coverage and may not happen to be located favourably to observe events of interest (Dickey, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…As the wind and wave re-suspension was negligible during this event, T is mostly related to the suspended particle load transported by the plumes in the basin (Sclavo et al, 2013;Tesi et al, 2011;Boldrin et al, 2009). Since T higher than ∼ 3-5 FNU can be deemed as indicative of terrestrial discharge in NAS (Boldrin et al, 2005(Boldrin et al, , 2009Tesi et al, Braga et al, 2013), these values were used to delineate the surface expression of the plumes in the T field from the adjacent ocean waters (Fig.…”

Section: Turbidity Fieldmentioning

confidence: 99%

“…Since T higher than ∼ 3-5 FNU can be deemed as indicative of terrestrial discharge in NAS (Boldrin et al, 2005(Boldrin et al, , 2009Tesi et al, Braga et al, 2013), these values were used to delineate the surface expression of the plumes in the T field from the adjacent ocean waters (Fig. 6).…”

Section: Turbidity Fieldmentioning

confidence: 99%

“…1) is considerable, since they can contribute with lowsalinity patches that are relevant to mesoscale and submesoscale dynamics (Marini et al, 2008;Solidoro et al, 2009). These freshwater discharges and associated particulate and dissolved matter inputs have a significant effect, both on the physical and biogeochemical properties of the whole basin (Zavatarelli et al, 1998;Marini et al, 2008;Solidoro et al, 2009;Bignami et al, 2007;Barale et al, 1986;Tesi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The NAS is a shallow (average depth is smaller than 35 m) and semi-enclosed regional sea, which due to the high amount of freshwater is generally considered a dilution basin (Degobbis et al, 2000;Spillman et al, 2007). Riverine input along the northern Adriatic coast is generally associated with sharp coastal fronts and significantly contributes in driving a southeastward current along the Italian coast (Bergamasco et al, 1999), while mechanisms and sub-mesoscale patterns of plume spreading within the basin are strongly controlled by the modulation of freshwater discharge and wind regime (Bignami et al, 2007;Falcieri et al, 2014;Spillman et al, 2007;Tesi et al, 2011). Sediment dispersal in the basin is mostly controlled by the wave action generated by dominant and prevailing winds blowing on the Adriatic Sea, namely, Bora and Sirocco (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution satellite turbidity and sea surface temperature observations of river plume interactions during a significant flood event

et al. 2015

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Abstract. Sea surface temperature (SST) and turbidity (T) derived from Landsat 8 (L8) imagery were used to characterize river plumes in the northern Adriatic Sea (NAS) during a significant flood event in November 2014. Circulation patterns and sea surface salinity (SSS) from an operational coupled ocean-wave model supported the interpretation of the plumes' interaction with the receiving waters and among them.There was a good agreement of the SSS, T, and SST fields at the sub-mesoscale and mesoscale delineation of the major river plumes. L8 30 m resolution also enabled the description of smaller plume structures. The different plumes' reflectance spectra were related to the lithological fingerprint of the sediments in the river catchments.Sharp fronts in T and SST delimited each single river plume. The isotherms and turbidity isolines' coupling varied among the plumes due to differences in particle loads and surface temperatures in the discharged waters. The surface expressions of all the river plumes occurring in NAS were classified based on the occurrence of the plume dynamical regions in the L8 30 m resolution imagery.

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Section: Discussionmentioning

confidence: 99%

Section: Turbidity Fieldmentioning

confidence: 99%

Section: Turbidity Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-resolution satellite turbidity and sea surface temperature observations of river plume interactions during a significant flood event

et al. 2015

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Matrix association effects on hydrodynamic sorting and degradation of terrestrial organic matter during cross‐shelf transport in the Laptev and East Siberian shelf seas

et al. 2016

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This study seeks an improved understanding of how matrix association affects the redistribution and degradation of terrigenous organic carbon (TerrOC) during cross-shelf transport in the Siberian margin. Sediments were collected at increasing distance from two river outlets (Lena and Kolyma Rivers) and one coastal region affected by erosion. Samples were fractionated according to density, size, and settling velocity. The chemical composition in each fraction was characterized using elemental analyses and terrigenous biomarkers. In addition, a dual-carbon-isotope mixing model (δ 13 C and Δ 14 C) was used to quantify the relative TerrOC contributions from active layer (Topsoil) and Pleistocene Ice Complex Deposits (ICD). Results indicate that physical properties of particles exert first-order control on the redistribution of different TerrOC pools. Because of its coarse nature, plant debris is hydraulically retained in the coastal region. With increasing distance from the coast, the OC is mainly associated with fine/ultrafine mineral particles. Furthermore, biomarkers indicate that the selective transport of fine-grained sediment results in mobilizing high-molecular weight (HMW) lipid-rich, diagenetically altered TerrOC while lignin-rich, less degraded TerrOC is retained near the coast. The loading (μg/m 2 ) of lignin and HMW wax lipids on the fine/ultrafine fraction drastically decreases with increasing distance from the coast (98% and 90%, respectively), which indicates extensive degradation during cross-shelf transport. Topsoil-C degrades more readily (90 ± 3.5%) compared to the ICD-C (60 ± 11%) during transport. Altogether, our results indicate that TerrOC is highly reactive and its accelerated remobilization from thawing permafrost followed by cross-shelf transport will likely represent a positive feedback to climate warming.Previous studies over this margin have exclusively focused on bulk (unfractionated) surface sediments. They have shown contrasting spatial trends for different classes of terrigenous biomarkers, suggesting that the TESI ET AL.SORTING AND DEGRADATION OF TERROC 731 PUBLICATIONS

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Evolution of wetlands in the northern part of the Po Delta: The experience of unmanaged realignments

Brunetta,

Ciavola

2024

Earth Surf Processes Landf

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It is increasingly recognised that nature‐based solutions in coastal ecosystems provide significant services compared to hard engineering measures. Several restoration projects are now being conducted worldwide to protect coastlines against flood risk and improve the ecosystems' quality. In the case of river deltas, managed realignment through levee breaching is becoming a recognised strategy for coastal wetland restoration. This study focusses on the formation of new wetlands in the Po River Delta after several natural dyke failures that occurred during the last century, when a large part of the land was abandoned and became wetlands. An historical review was performed to quantify the variation of the marsh extent in time developed after natural levee breaching in the easternmost lagoons of the delta and to understand the processes that determined their evolution. The analyses were based on orthophotos from the 1950s to the present‐day integrated with tidal records, water and sediment discharge records, and GPS survey for vegetation distribution. The review indicated that, between the 1950s and 1980s, anthropisation and natural processes caused a strong decline in marsh extent, thus leading to the recent shape of the lagoons. Several breaches and inlets were developed because of a combination of human intervention and erosive processes, and new tidal systems were born. Three main depositional areas connecting the main river branches were identified in three separated lagoons of the delta. These lagoons presented a ‘crevasse splay’ type of deposition which allowed the development of new tidal flats and, in certain cases, of large freshwater marsh systems within less than 8 years after the breach. The newly formed wetland systems (>100 ha) demonstrate the ability of the Po River Delta to build new wetlands, also during periods of human‐induced sediment starvation and high rates of subsidence, suggesting that further levee breaching should be exploited to favour marsh recovery.

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Influence of distributary channels on sediment and organic matter supply in event-dominated coastal margins: the Po prodelta as a study case

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Cited by 37 publications

References 46 publications

High-resolution satellite turbidity and sea surface temperature observations of river plume interactions during a significant flood event

High-resolution satellite turbidity and sea surface temperature observations of river plume interactions during a significant flood event

Matrix association effects on hydrodynamic sorting and degradation of terrestrial organic matter during cross‐shelf transport in the Laptev and East Siberian shelf seas

Evolution of wetlands in the northern part of the Po Delta: The experience of unmanaged realignments

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