A bedload transport equation for the Cerastoderma edule cockle

Anta, José; Peña, Enrique; Puertas, Jerónimo; Cea, Luís

doi:10.1016/j.jmarsys.2012.10.014

Cited by 11 publications

(18 citation statements)

References 30 publications

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“…m -2 density (Table 4). Thus, in the analysed density range and under the same flow conditions, an inverse relationship was observed between population density and shear velocity (Anta et al 2013), which explains why erosion rates are higher for lower densities in both size class and natural distribution experiments. Furthermore, contrary to the size class trials, the percentage of eroded cockles in the natural population experiments is independent of the bivalve activity (Table 4).…”

Section: Erosion Ratesmentioning

confidence: 65%

“…For the same flow conditions, shear velocity increases with mollusc size and low population densities. Furthermore, size class trials show larger values than natural distribution experiments (Anta et al 2013).…”

Section: Flow Characterizationmentioning

confidence: 84%

“…In this configuration, the streamlines adapts to the cockle gaps and the shear production is greater. In the high-density patches cockle separation is much smaller and the flow structure is similar to quasi-smooth or skimming flows (Anta et al 2013).…”

Section: Discussionmentioning

confidence: 97%

“…Under these circumstances, a proper knowledge of the erosion and transport processes of the molluscs and of the hydrodynamic conditions of the estuary is essential in order to predict these dispersal events. Using the experimental data from this study, a bedload transport model for the natural distribution of the cockle population was developed by the authors using a conventional deterministic sediment transport framework (Anta et al 2013). The formulas obtained are being implemented in a 2D shallow water code developed by the author's research team (Cea et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…In order to do this, we applied the double-averaged (DA) methodology, which consists in the spatial and temporal averaging of the hydrodynamic variables within thin slabs parallel to the mean bed position. Fundamentals of the DA method can be found in Nikora et al (2007) and are also summarized in Anta et al (2013). With this procedure we determined the double (spatial and temporal) averaged velocity profile and the shear velocity u * .…”

Section: Flow Characterizationmentioning

confidence: 99%

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Effects of density and size distribution on the erosion of the adult cockle <i>Cerastoderma edule</i>

Anta¹,

Peña²,

Puertas³

2013

Sci. Mar.

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SUMMARY: A series of experimental flume experiments were carried out to evaluate the passive transport of the adult cockle Cerastoderma edule with shell sizes from 15 to 35 mm. The purpose of the study was to measure the erosion of this bivalve under controlled laboratory conditions, reproducing the current velocities and the cockle size distribution found at the Lombos do Ulla river mouth in Spain during high river discharges. Increasing velocities (0.29, 0.31, 0.35, 0.40, 0.44 and 0.47 m s -1 ) were applied to the bivalves, analysing the influence of population density (500 and 1000 ind. m -2 ), activity (live vs dead individuals), and mollusc size and distribution. To assess the effect of bivalve size distribution on the cockle transport, uniform and non-uniform cockle size distributions were tested. The particle image velocimetry technique and the doubleaveraged methodology were used to determine velocity fields during the experiments. In the experiments cockle erosion rates were found to be directly related to the flow velocity and inversely related to the population density. The erosion behaviour of uniform and graded cockle size distributions showed differences similar to those found in the bedload transport of uniform and non-uniform sediment mixtures. Our results provide a mechanism to explain the observed physical transport of bivalve populations after large storm events.Keywords: Cerastoderma edule, erosion, flume experiments, particle image velocimetry, double-averaged methodology.RESUMEN: EfEcto dE la dEnsidad dE población y la distribución dE tallas En la Erosión dE bErbErEchos Cerastoderma edule adultos. -En este trabajo se han desarrollado una serie de ensayos en laboratorio analizando el transporte de berberechos Cerastoderma edule adultos de tamaños de entre 15 y 35 mm. El objetivo del estudio ha sido medir la erosión de este bivalvo bajo condiciones controladas de laboratorio, reproduciendo las velocidades y la distribución de tamaños del berberecho del banco marisquero de Os Lombos do Ulla (España) durante episodios de caudales altos en la desembocadura del río. Una serie de velocidades crecientes (0.29, 0.31, 0.35, 0.40, 0.44 y 0.47 m s -1 ) fueron aplicadas a los bivalvos, analizando la influencia de la densidad de población (500 y 1000 ind. m -2 ), la actividad (berberechos vivos vs muertos), y la talla y distribución de tamaños. Para estudiar el efecto de la distribución de tamaños de los bivalvos en su transporte se emplearon distribuciones uniformes y no uniformes de berberechos. Para estimar los campos de velocidades durante los experimentos se aplicó la técnica de velocimetría láser de partículas (PIV) y la metodología del doble promediado (DA). En los experimentos se halló que el transporte de los berberechos está directamente relacionado con la velocidad del flujo e inversamente relacionado con la densidad de población. Los procesos de erosión de las distribuciones de berberechos uniformes y graduadas presentaron diferencias similares a las halladas en el transporte de mezclas de s...

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Section: Erosion Ratesmentioning

confidence: 65%

Section: Flow Characterizationmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Flow Characterizationmentioning

confidence: 99%

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Effects of density and size distribution on the erosion of the adult cockle <i>Cerastoderma edule</i>

Anta¹,

Peña²,

Puertas³

2013

Sci. Mar.

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Contrasting strategies to cope with storm‐induced erosion events: a flume study comparing a native vs. introduced bivalve

Wiesebron

Teeuw

Dalen

et al. 2022

Limnology & Oceanography

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Storm-induced erosion events may alter the diversity of tidal flat communities by selecting species that can better tolerate such disturbances. Introduced and invasive species are highly adaptable to a wide range of abiotic characteristics, and this adaptability may make them better able to withstand erosion events. With a novel flume method, we compared the ability of two bivalve species to resist storm-induced erosion: Cerastoderma edule, a native species to the Scheldt estuary in the Netherlands, and Ruditapes philippinarum, an introduced species that is successful in the Netherlands and worldwide. We used three sediment erosion rates to simulate storms of increasing severity. At the 10.6 and 15.9 cm h À1 sediment erosion rates, all R. philippinarum were surfaced, whereas only half C. edule were surfaced. However, after being brought to the sediment surface, C. edule were more readily transported by currents and waves than R. philippinarum due to differences in their shell shape. We concluded that the two bivalve species had different strategies to avoid mortality by severe storm erosion: C. edule avoided being surfaced and R. philippinarum avoided being transported. In this case, it appears that extreme storms favor the specific adaptations of a native species over the broad adaptability of a non-indigenous one. Indeed, C. edule may be more likely to survive moderately extreme storms than R. philippinarum, though the most extreme storms would be equally devastating to both species.

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Biological and physical drivers of bio-mediated sediment resuspension: A flume study on Cerastoderma edule

Cozzoli

Conceição

Dalen

et al. 2020

Estuarine, Coastal and Shelf Science

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A bedload transport equation for the Cerastoderma edule cockle

Cited by 11 publications

References 30 publications

Effects of density and size distribution on the erosion of the adult cockle <i>Cerastoderma edule</i>

Effects of density and size distribution on the erosion of the adult cockle <i>Cerastoderma edule</i>

Contrasting strategies to cope with storm‐induced erosion events: a flume study comparing a native vs. introduced bivalve

Biological and physical drivers of bio-mediated sediment resuspension: A flume study on Cerastoderma edule

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