Tidal Flow Asymmetry and Discharge of Lateral Tributaries Drive the Evolution of a Microtidal Meander in the Venice Lagoon (Italy)

Finotello, Alvise; Canestrelli, Alberto; Carniello, Luca; Ghinassi, Massimiliano; D’Alpaos, Andrea

doi:10.1029/2019jf005193

Cited by 30 publications

(60 citation statements)

References 88 publications

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“…Nidzieko (2010) investigated three California estuaries with negative tidal asymmetries imposed in their mouths and demonstrated that such asymmetries increase or decrease (according to the estuarine morphology) as the tide propagates landward and therefore affects several internal processes. Similarly, Ferrarin et al (2015) and Finotello et al (2019) point out that the inlet region and the main channels of Venice lagoon were dominated by the negative tidal asymmetry of the North Adriatic Sea. Ferrarin et al (2015) obtained the annual value of γ 1 in the period 1976-2014 with the data of a tide gauge station located 15 km offshore from the Venice lagoon inlets and verified that γ 1 oscillated around an average value of −0.09, coinciding with the results of the classification carried out in this study.…”

Section: Discussionmentioning

confidence: 93%

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A Global Classification of Astronomical Tide Asymmetry and Periodicity Using Statistical and Cluster Analysis

2020

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Tidal asymmetry plays a key role in the behavior of estuaries. Positive and negative asymmetries are associated with flood‐ and ebb‐dominated estuaries, respectively. Asymmetry arises from both the interaction among the main tidal constituents and the harmonics generated when tide propagates in shallow waters. Most previous research focuses on the deformation of the tide within estuaries; however, ocean tide may show asymmetry at the estuary entrance, which implies that the boundary condition is already deformed. This fact has important implications for tide propagation, estuarine transport processes, and flow exchanges between estuaries and open oceans. In this study, the global astronomical tide is classified according to its asymmetry and periodicity. The objective is to provide a guiding framework of representative astronomical tide types (ATtypes) on a worldwide scale to be used as a reference for further research on the transport of substances in estuaries. The applied methodology is based on the use of the TPXO9‐atlas global barotropic tidal solution and detailed statistical analysis. Probability density functions of the tidal elevation time derivative and the tidal form factor were extracted from TPXO9‐atlas with a spatial resolution ranging from 1/6° to 1/30°. The K‐means algorithm was applied to these parameters, and 25 representative ATtypes were identified. The classification was validated with 757 worldwide tide gauge records. The results show that 11.3% of coastal areas show negative asymmetries, 11.3% positive asymmetries, while symmetric tides dominate 77.4% of coastal areas. In these areas, estuaries can show asymmetries exclusively dependent on overtides and compound tides generated during inland propagation without being externally conditioned.

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Section: Discussionmentioning

confidence: 93%

“…(2015) and Finotello et al. (2019) point out that the inlet region and the main channels of Venice lagoon were dominated by the negative tidal asymmetry of the North Adriatic Sea. Ferrarin et al.…”

Section: Discussionmentioning

confidence: 99%

A Global Classification of Astronomical Tide Asymmetry and Periodicity Using Statistical and Cluster Analysis

2020

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“…It has been shown that morphological changes due to intensive human interventions are widespread and may cause significant alternations in water levels and related tidal hydrodynamics (Jay, 1991; Vriend, 1991; Chernetsky, Schuttelaars, & Talke, 2010; Zhang et al, 2010; Finotello et al, 2019). Based on the morphological metrics summarized in Table 3, we observed that the net sedimentation rate in Lingdingyang Bay switched from positive to negative in 2005.…”

Section: Discussionmentioning

confidence: 99%

“…Temporal–spatial tidal forcing affects not only the transport of sediments, nutrients, and contaminants (Falcão, Santos, Drago, Serpa, & Monteiro, 2009; Bonaldo et al, 2014) in estuaries but also salt intrusion and storm surge propagation (Zhang, Savenije, Wu, Kong, & Zhu, 2011; Zhang, Savenije, Chen, & Mao, 2012; Li, Zhu, Wu, & Guo, 2014). In recent decades, intensive human activities (e.g., dredging for navigation, sand excavation, and land reclamation) have dramatically changed the morphology of many estuaries and, have caused the erosion of estuarine saltmarshes (Bendoni et al, 2016; Francalanci, Bendoni, Rinaldi, & Solari, 2013; Tommasini, Carniello, Ghinassi, Roner, & D'Alpaos, 2019) and altered the tidal regimes and hydrodynamics (Zhang et al, 2017; Mei et al, 2018; Wu et al, 2018; Zhang et al, 2018; Finotello Canestrelli, Carniello, Ghinassi, & D'Alpaos, 2019). For these reasons, the response of tidal forcing to human activities has attracted worldwide research attention.…”

Section: Introductionmentioning

confidence: 99%

Tidal regime shift in Lingdingyang Bay, the Pearl River Delta: An identification and assessment of driving factors

Wang

Ping

Zhou

et al. 2020

Hydrological Processes

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Both natural changes (e.g., tidal forcing from the ocean and global sea level rise) and human‐induced changes (e.g., dredging for navigation, sand excavation, and land reclamation) exert considerable influences on the long‐term evolution of tidal regimes in estuaries. Evaluating the impacts of these factors on tidal‐regime shifts is particularly important for the protection and management of estuarine environments. In this study, an analytical approach is developed to investigate the impacts of estuarine morphological alterations (mean water depth and width convergence length) on tidal hydrodynamics in Lingdingyang Bay, Southeast China. Based on the observed tidal levels from two tidal gauging stations along the channel, tidal wave celerity and tidal damping/amplification rate of different tidal constituents are computed using tidal amplitude and phase of tidal constituents extracted from a standard harmonic analysis. We show that the minimum mean water depth for the whole estuary occurred in 2006, whereas a shift in tidal wave celerity for the M2 tide component occurred in 2009. As such, the study period (1990–2016) could be separated into pre‐human (1990–2009) and post‐human (2010–2016) phases. Our results show that the damping/amplification rate and celerity of the M2 tide have increased by 31% (from 7 to 9.2 m−1) and 28% (from 7 to 9 m·s−1) respectively, as a consequence of the substantial impacts of human interventions. The proposed analytical method is subsequently applied to analyse the historical development of tidal hydrodynamics and regime shifts induced by human interventions, thus linking the evolution of estuarine morphology to the dominant tidal hydrodynamics along the channel. The observed tidal regime shift is primarily caused by channel deepening, which substantially enlarged the estuary and reduced effective bottom friction resulting in faster celerity and stronger wave amplification. Our proposed method for quantifying the impacts of human interventions on tidal regime shifts can inform evidence‐based guidelines for evaluating hydraulic responses to future engineering activities.

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“…The present‐day configuration of the lagoon is characterized by the presence of sparse salt marshes (Finotello et al ., 2020b) undergoing rapid erosion in the last two centuries (D’Alpaos, 2010; Tommasini et al ., 2019), wide subtidal platforms, and tidal flats that are cut by intertidal and subtidal channels (Finotello et al. , 2019; Ghinassi et al. , 2019) (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

An integrated approach to determine three‐dimensional accretion geometries of tidal point bars: Examples from the Venice Lagoon (Italy)

et al. 2020

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Low rates of lateral migration (centimetres to decimetres per year) combined with relatively high rates of vertical accretion (millimetres to centimetres per year) recorded in microtidal channels of the Venice Lagoon (Italy) give rise to point-bar geometries and internal facies arrangements that differ substantially from widely accepted models of point-bar sedimentary architecture. In this study, field data from the Venice Lagoon are combined with a three-dimensional forward stratigraphic model, the 'Point-Bar Sedimentary Architecture Numerical Deduction' (PB-SAND), to predict the stratal geometries of point bars formed in aggradational settings. The PB-SAND uses a combined geometric and stochastic modelling approach that can be constrained by field evidence. The model applied determines the geometry of four point bars generated by 9 to 11 m wide channels cutting through salt marshes. An iterative best-fit modelling approach has been used to obtain multiple simulations for each case study, each of which fits the observations derived from the analysis of time-series historical aerial photographs and 44 sedimentary cores. Results demonstrate how the geometry of the bars is determined by the development of two key stratal surfaces: the point-bar brink and channel-thalweg surfaces. These surfaces are defined by the progressive translation and vertical shift of the point-bar brink (i.e. break of slope between bar top and bar slope) and the channel thalweg (i.e. deepest part of the channel) during bar evolution. The approach is used to: (i) reconstruct three-dimensional point-bar geometries; (ii) propose alternative reconstructions; (iii) provide insight to drive the acquisition of additional data to better constrain the proposed models; and (iv) provide insight into the mechanism of bar growth for slowly migrating channels in settings subject to relatively high rates of aggradation. This study highlights how interaction between styles of planform transformation and latero-vertical shifts of meandering channels can determine the geometry of related sedimentary bodies. Keywords Aggradation, channel-thalweg trajectory, point-bar brink trajectory, tidal meander, Venice Lagoon. negligible with respect to lateral migration processes. Hence, point bars are commonly described as purely laterally accreting bodies

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Tidal Flow Asymmetry and Discharge of Lateral Tributaries Drive the Evolution of a Microtidal Meander in the Venice Lagoon (Italy)

Cited by 30 publications

References 88 publications

A Global Classification of Astronomical Tide Asymmetry and Periodicity Using Statistical and Cluster Analysis

A Global Classification of Astronomical Tide Asymmetry and Periodicity Using Statistical and Cluster Analysis

Tidal regime shift in Lingdingyang Bay, the Pearl River Delta: An identification and assessment of driving factors

An integrated approach to determine three‐dimensional accretion geometries of tidal point bars: Examples from the Venice Lagoon (Italy)

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