2020
DOI: 10.1111/sed.12787
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An integrated approach to determine three‐dimensional accretion geometries of tidal point bars: Examples from the Venice Lagoon (Italy)

Abstract: 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… Show more

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Cited by 8 publications
(9 citation statements)
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“…The subsequent gentle rise of the thalweg during stage 3 was probably related to the maintenance of its formative depth, which was reached at the end of stage 2. During this stage, sediments are accumulated in the channel to maintain a constant equilibrium depth in the frame of keeping dynamic equilibrium conditions (sensu Allen, 2000) with the surrounding aggradational tidal flats (Cosma et al, 2019(Cosma et al, , 2021. This process could have also been enhanced by the activation of the minor channel, which connected bends 1 and 3 causing a local drop in the strength of erosional forces within bend 2 (cf.…”
Section: Channel Morphology Thalweg Trajectories and Pools Developmentmentioning
confidence: 99%
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“…The subsequent gentle rise of the thalweg during stage 3 was probably related to the maintenance of its formative depth, which was reached at the end of stage 2. During this stage, sediments are accumulated in the channel to maintain a constant equilibrium depth in the frame of keeping dynamic equilibrium conditions (sensu Allen, 2000) with the surrounding aggradational tidal flats (Cosma et al, 2019(Cosma et al, , 2021. This process could have also been enhanced by the activation of the minor channel, which connected bends 1 and 3 causing a local drop in the strength of erosional forces within bend 2 (cf.…”
Section: Channel Morphology Thalweg Trajectories and Pools Developmentmentioning
confidence: 99%
“…Distinctive sedimentary features of these bar deposits are classically considered to be (Allen, 1982): (i) a shell‐rich channel lag; (ii) bedforms diagnostic of bidirectional flows; (iii) alternation between sandy and silty layers; and (iv) intense bioturbation. Recent studies provided new insights on the morphometry and sedimentology of intertidal meanders (Fagherazzi & Gabet, 2004; Pearson & Gingras, 2006; Choi, 2011; Hughes, 2012; Choi et al ., 2013; Choi & Jo, 2015; Brivio et al ., 2016; Ghinassi et al ., 2018b; Cosma et al ., 2019, 2021; Finotello et al ., 2019), revealing that: (i) intertidal‐meander migration rates are comparable to those of their fluvial counterparts, once properly normalized by the channel width (Finotello et al ., 2018); (ii) geometry of intertidal point bars is the result of the interaction between channel‐migration rate and aggradation rate of the surrounding marsh platform (Brivio et al ., 2016; Cosma et al ., 2019, 2021); (iii) morphometry of intertidal meanders can differ from that of their fluvial counterparts (Finotello et al ., 2019); and (iv) complex flow configurations, due to the occurrence of mutually evasive currents and recirculation zones, can prevent portions of bar deposits from experiencing bidirectional currents, thereby inhibiting the formation of bedforms retaining the signatures of bidirectional flows (Dalrymple & Choi, 2007; Li et al ., 2008; Choi et al ., 2013; Finotello et al ., 2020a).…”
Section: Introductionmentioning
confidence: 99%
“…In this contribution aimed at pointing out the features of the novel subsurface model, ω has been specified through simplified functions. In our viewpoint NATSUB3D represents a module that could be effectively coupled to surface morphodynamic simulators, for example, DELFT3D (https://oss.deltares.nl/web/delft3d), TELEMAC‐MASCARET (http://www.opentelemac.org/), or other research simulators addressing the evolution of more specific depositional environments but neglecting soil compaction (Cosma et al., 2021; Kim et al., 2009). This will improve the available tools to understand the dynamics of depositional landscapes, as well as increase our ability to quantify processes that drive their evolution.…”
Section: Discussionmentioning
confidence: 99%
“…Even though the modelling approach allows evaluating the impact of aggradation on sand volume and distribution ( cf . Cosma et al ., 2020; Yan et al ., 2020), channel‐bed aggradation was not simulated in this study to enable isolation of the effects of planform evolution. The process of vertical aggradation would generally increase the overall thickness of point‐bar deposits and overall sand volume and fraction (Willis & Tang, 2010; Ghinassi et al ., 2014).…”
Section: Discussionmentioning
confidence: 99%