Morphodynamics of nearshore rhythmic sandbars in a mixed-energy environment (SW France): I. Mapping beach changes using visible satellite imagery

Lafon, Virginie; Apoluceno, D. De Melo; Dupuis, Hélène; Michel, Denis; Howa, Hélène; Froidefond, Jean-Marie

doi:10.1016/j.ecss.2004.05.006

Cited by 51 publications

(43 citation statements)

References 32 publications

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“…Long-term data acquired on TVB consist of bi-monthly low-tide mark surveys (De Melo Apoluceno et al, 2002), satellite imagery (Lafon et al, 2002(Lafon et al, , 2004(Lafon et al, , 2005 and linear principal components analysis on a monthly to bimonthly single measured cross-shore profile (Rihouey, 2004). The results of most of these studies have been synthesised in Castelle et al (2007).…”

Section: Study Areamentioning

confidence: 99%

Morphodynamic response of a meso- to macro-tidal intermediate beach based on a long-term data set

et al. 2009

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Section: Study Areamentioning

confidence: 99%

Morphodynamic response of a meso- to macro-tidal intermediate beach based on a long-term data set

et al. 2009

Self Cite

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“…Two weeks before the beginning of the field experiment, TVB had a well-developed crescentic subtidal bar system (Fig. 17a), typical of previous observations (Lafon et al 2004;Castelle et al 2007) with a mean wavelength of about 620 m and a symmetrical shape. A transverse bar and rip system is also observed in the inter-tidal domain.…”

Section: Large-scale Morphology Evolution During the Field Experimentsmentioning

confidence: 68%

“…The inner bar, generally situated in the lower inter-tidal domain, can evolve through all the morphological states within the intermediate classification (see Wright and Short 1984;Masselink and Short 1993) and usually exhibits a transverse bar and rip morphology ) that can evolve into a low-tide terrace with a mean wavelength of 400 m after long periods (at least 10 days) of fair weather conditions (De Melo Apoluceno et al 2002;Castelle et al 2007). The outer-bar system, situated about 800 m offshore of the high-tide shoreline in water depths less than 10 m at high tide, exhibits persistent crescentic patterns with a narrow range Castelle et al 2007) of about 700 m (Lafon et al 2004). Various aerial photographs and visual observations suggest that a 10-year storm may be required to straighten the outer bar (Castelle et al 2007).…”

Section: Truc Vert Beach Large-scale Morphodynamicsmentioning

confidence: 99%

The ECORS-Truc Vert’08 nearshore field experiment: presentation of a three-dimensional morphologic system in a macro-tidal environment during consecutive extreme storm conditions

et al. 2011

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A large multi-institutional nearshore field experiment was conducted at Truc Vert, on the Atlantic coast of France in early 2008. Truc Vert'08 was designed to measure beach change on a long, sandy stretch of coast without engineering works with emphasis on large winter waves (offshore significant wave height up to 8 m), a threedimensional morphology, and macro-tidal conditions. Nearshore wave transformation, circulation and bathymetric changes involve coupled processes at many spatial and temporal scales thus implying the need to improve our knowledge for the full spectrum of scales to achieve a comprehensive view of the natural system. This experiment is unique when compared with existing experiments because of the simultaneous investigation of processes at different Dynamics (2011) 61:2073-2098 DOI 10.1007 scales, both spatially (from ripples to sand banks) and temporally (from single swash events to several spring-neap tidal cycles, including a major storm event). The purpose of this paper is to provide background information on the experiment by providing detailed presentation of the instrument layout and snapshots of preliminary results.

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“…More often, inner-bar rip channels possess remarkably smaller and more variable alongshore scales than the outer bar (Barusseau et al, 1994;Van Enckevort et al, 2004;Lafon et al, 2004Lafon et al, , 2005. Figure 1 shows a typical double sandbar system geometry with an outer bar exhibiting crescentic patterns at a narrow range of wavelength, which contrasts with highly alongshore-variable inner-bar rip channels.…”

Section: Introductionmentioning

confidence: 97%

Coupling mechanisms in double sandbar systems. Part 2: impact on alongshore variability of inner‐bar rip channels

Castelle

Ruessink

Bonneton

et al. 2010

Earth Surf Processes Landf

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Double sandbar systems are common morphological features along sandy, wave-dominated, micro-to meso-tidal coastlines. In the companion paper, we demonstrated how various alongshore inner-bar rip-channel patterns can develop through morphological coupling to an alongshore-variable outer bar. The simulated coupling patterns are, however, scarcely observed in the fi eld. Instead, inner-bar rip channels more often possess remarkably smaller and more variable alongshore length scales, suggesting that coupling mechanisms do not play a substantial role in the overall double-sandbar dynamics. Here we use a numerical model to show that the relative importance of self-organization and morphological coupling changes in favour of the latter with an increase in waterdepth variability along the outer-bar crest. Furthermore, we fi nd that the typical alongshore variability in inner-bar rip-channel scale is indicative of a mixture of self-organization and morphological coupling rather than self-organization alone. Morphological coupling may thus be more important to understanding and predicting the evolution of inner-bar rip channels than previously envisaged.

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Morphodynamics of nearshore rhythmic sandbars in a mixed-energy environment (SW France): I. Mapping beach changes using visible satellite imagery

Cited by 51 publications

References 32 publications

Morphodynamic response of a meso- to macro-tidal intermediate beach based on a long-term data set

Morphodynamic response of a meso- to macro-tidal intermediate beach based on a long-term data set

The ECORS-Truc Vert’08 nearshore field experiment: presentation of a three-dimensional morphologic system in a macro-tidal environment during consecutive extreme storm conditions

Coupling mechanisms in double sandbar systems. Part 2: impact on alongshore variability of inner‐bar rip channels

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