Tidal changes in a heavily modified coastal wetland

Ferrarin, Christian; Tomasin, Alberto; Bajo, Marco; Petrizzo, Antonio; Umgiesser, Georg

doi:10.1016/j.csr.2015.04.002

Cited by 65 publications

(83 citation statements)

References 57 publications

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“…This implies a limited mobility of bottom sediments. Therefore, even if the tidal currents in the Venice Lagoon are ebb dominated (Ferrarin et al, ), the presence of flood‐dominated bedforms indicates that the action of flood currents is relevant. The flood orientation of the bedforms on the landward side of the scour could be also due to vertical recirculation near the bed during ebb flow (MacVicar & Rennie, ).…”

Section: Discussionmentioning

confidence: 99%

“…Considering the above findings, stating the role of the tidal currents in shaping the confluence scours, we discuss here the processes that induced the long‐term morphological changes highlighted by comparing the historical bathymetric datasets. To this end, we have to consider that human interventions strongly altered the hydrodynamics in the tidal channel network (Carniello et al, ; L. D'Alpaos, ; L. D'Alpaos & Martini, ; Ferrarin et al, ; Tambroni & Seminara, ).…”

Section: Discussionmentioning

confidence: 99%

“…In fluvial systems and coastal areas, man has become one of the major geomorphological agents, determining substantial changes in the characteristics of the Earth's physical landscapes (Hoitink et al, 2017;Hooke et al, 2012;Maselli & Trincardi, 2013;Rhoads et al, 2016;Syvitski et al, 2009). The Venice Lagoon was subjected to several human modifications that altered the hydrodynamics in the tidal channel network (Carniello et al, 2009;D'Alpaos, 2010;Ferrarin et al, 2015;Sarretta et al, 2010;Tambroni & Seminara, 2006). As several historical bathymetric maps are available, it is therefore an ideal site for studying the long-term morphological evolution of scours at channel confluences.…”

Section: 1029/2017jf004489mentioning

confidence: 99%

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Geomorphology of Scour Holes at Tidal Channel Confluences

et al. 2018

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The morphology of scour holes at tidal channel confluences was investigated through high‐resolution acoustic mapping of the channel network in the Venice Lagoon (Italy). Our investigation identified 29 confluence scours ranging in depth from 7 to 26 m and characterized by different confluence geometry and scour properties. Scours were found at the confluence of two or more channels, having equal or unequal bed heights and a diverse confluence planform geometry. The main morphological characteristics of the scours were compared to literature data from fluvial environments. Like in rivers, the scour depth tends to increase with the angle of the confluence. Moreover, the maximum depth of the confluence scours in the Venice Lagoon is positively correlated with the tidal prism of the channels joining the confluence. The investigation of the seafloor features in the scour holes highlighted that, generally, small‐ and medium‐scale bedforms are present on the gentle slope. The scours' seafloor roughness indicated that in tidal channels both ebb and flood flows combine in shaping the confluence morphology. In addition, the analysis of historical bathymetric datasets dating back to the 1800s allowed us to analyze the morphological evolution of two of these erosive features. Our findings revealed the century‐scale morphological dynamics of scour holes, as a consequence of changes in the flow regime.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: 1029/2017jf004489mentioning

confidence: 99%

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Geomorphology of Scour Holes at Tidal Channel Confluences

et al. 2018

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“…The recent construction of the MoSE structures (an acronym for Modulo Sperimentale Elettromeccanico or Experimental Electromechanical Module a name given to the earliest prototype built to test the functionality of the mobile barriers) at the inlets could substantially affect the lagoon environment by reducing the tidal exchange and increasing the ebb‐dominance over tidal flats (Tambroni and Seminara, ; Ghezzo et al ., ; Ferrarin et al ., ). The mobile barrier project will prevent flooding through the installation of 78 mobile gates, laying at the bottom of the inlet channels (Lido, Malamocco and Chioggia) connecting the Venice Lagoon from the Adriatic Sea.…”

Section: Geographical Settingmentioning

confidence: 97%

Tidal inlets in the Anthropocene: Geomorphology and benthic habitats of the Chioggia inlet, Venice Lagoon (Italy)

Fogarin

Madricardo

Zaggia

et al. 2019

Earth Surf Processes Landf

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Adopting a multidisciplinary approach, we mapped with unprecedented detail the seafloor morphology, sediment distribution and benthic habitats of a tidal inlet in the Venice Lagoon, Italy, which has been greatly impacted by human activity. Thanks to very high-resolution multibeam data, we identified ebb and flood-tidal deltas, a tidal point bar, active dune fields, pools and scour holes.The seafloor substrate of the inlet was investigated by integrating automatically classified multibeam backscatter data with sediment samples and underwater seafloor images. The sediment composition comprises four textural classes with 75% overall thematic accuracy. The particle size distribution of each morphological feature was assessed distinguishing, in particular, sediments over crests and troughs of small-dune fields with wavelengths and heights of less than 4 m and 0.2 m, respectively.Adopting state-of-the-art benthic habitat mapping procedures, we found seven distinctive benthic habitats that reflect spatial variability in hydrodynamics and sediment transport pathways. The dominant classes were Sand with sparse shell detritus (46%) and Bare sand (32%). The rip-rap revetment used for the inlet jetties and for the hard structures, built in the inlet channel to protect Venice from flooding, created a new habitat that covers 5.5% of the study area. This study shows how combining geomorphological and ecological analyses is crucial for the monitoring and management of tidal inlets and coastal infrastructures.

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“…With falling computational costs in hydraulic modelling (Grashorn, Lettmann, Wolff, Badewien, & Stanev, 2015; Liu, Zhu, Liu, Zhu, & Qin, 2014a; Zhang et al, 2015), numerous studies have reported changes in tidal hydrodynamics and their influencing factors in tide‐dominated estuaries based on numerical models (e.g., Cerralbo, Grifoll, Valle‐Levinson, & Espino, 2014; Fong & Heaps, 1978; Greenberg, 1979; Liang, Xia, Falconer, & Zhang, 2015; Zhong, Ming, & Foreman, 2008; Ferrarin, Tomasin, Bajo, Petrizzo, & Umgiesser, 2015). Alternatively, analytical approaches can serve as useful tools, having the advantages of providing direct insights into the effects of controlling parameters (e.g., geometry and forcing) on fundamental tidal characteristic, including tidal amplitude, velocity amplitude, tidal damping/amplification, wave celerity, and phase differences between velocity and elevation.…”

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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Tidal changes in a heavily modified coastal wetland

Cited by 65 publications

References 57 publications

Geomorphology of Scour Holes at Tidal Channel Confluences

Geomorphology of Scour Holes at Tidal Channel Confluences

Tidal inlets in the Anthropocene: Geomorphology and benthic habitats of the Chioggia inlet, Venice Lagoon (Italy)

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

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