Vertical distribution of longshore sediment transport on barred macrotidal beaches, northern France

Cartier, Adrien; Héquette, Arnaud

doi:10.1016/j.csr.2014.11.009

Cited by 16 publications

(12 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reversing of tidal currents does not occur at high or low tide, but typically after a delay of two to three hours, which is consistent with the propagation of a dominantly progressive tidal wave in the Eastern Channel [4]. Current measurements conducted in previous studies show that the speeds of flood currents exceed those of the ebb, resulting in a net flood-dominated asymmetry in the coastal zone [19,43]. The prevailing winds in the region are from west to southwest, with a secondary wind direction from north to northeast [44].…”

Section: Study Areasupporting

confidence: 72%

“…In recent years, an increasing number of papers were published on the morphodynamics of barred macrotidal beaches, which gave some insight into the morphological behavior of intertidal bar-trough systems (e.g., [1][2][3][4][5][6]). However, although hydrodynamics were generally investigated in these studies, most of them were primarily focused on either the morphodynamics of intertidal bars [3,4,[7][8][9][10][11] or on sediment transport processes [12][13][14][15][16][17][18][19]. Comparatively, fewer papers were specifically concerned with the hydrodynamics of barred macrotidal beaches (e.g., [1,20,21]).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effects of Tidal Translation on Wave and Current Dynamics on a Barred Macrotidal Beach, Northern France

Héquette

Cartier²,

Schmitt

2021

JMSE

Self Cite

View full text Add to dashboard Cite

Barred macrotidal beaches are affected by continuous horizontal displacements of different hydrodynamic zones associated with wave transformation (shoaling, breaker and surf zones) due to significant tide-induced water level changes. A series of wave and current meters, complemented by a video imagery system, were deployed on a barred beach of northern France during a 6-day experiment in order to characterize the spatial and temporal variability of wave-induced processes across the beach. Wave and current spectral analyses and analyses of cross-shore current direction and asymmetry resulted in the identification of distinct hydrodynamic processes, including the development of infragravity waves and offshore-directed flows in the breaker and surf zones. Our results revealed a high spatial variability in the hydrodynamic processes across the beach, related to the bar-trough topography, as well as significant variations in the directions and intensity of cross-shore currents at fixed locations due to the horizontal translation of the different hydrodynamic zones resulting from continuous changes in water level due to tides.

show abstract

Section: Study Areasupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

The Effects of Tidal Translation on Wave and Current Dynamics on a Barred Macrotidal Beach, Northern France

Héquette

Cartier²,

Schmitt

2021

JMSE

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sediment transport is also dominated by longshore transport east of Dunkirk (Cartier and Héquette, ) that probably contributes to the redistribution of eroded material along the coast. However, wave height and longshore current velocity are generally lower on the beach east of Dunkirk than on the beach of the Bay of Wissant (Cartier and Héquette, ) where longshore sediment transport can be extremely high during storms (Sedrati and Anthony, ), resulting in substantial sediment dispersal along the coast which probably leads to negative beach sediment budget. East of Dunkirk, the positive sediment budget of the coastal zone can be explained by more limited sediment dispersal by lower energy waves and by tidal‐ and wave‐induced currents of lower velocity, but also by the effectiveness of aeolian processes that are responsible for the transport and deposition of sand from the intertidal zone to the upper beach from which it can be recycled to the coastal dunes (Anthony et al , ).…”

Section: Discussionmentioning

confidence: 99%

Variations in the response of the dune coast of northern France to major storms as a function of available beach sediment volume

Crapoulet

Héquette

Marin

et al. 2017

Earth Surf Processes Landf

Self Cite

View full text Add to dashboard Cite

A series of airborne topographic LiDAR data were obtained from May 2008 to January 2014 over two coastal sites of northern France (Bay of Wissant and east of Dunkirk). These data were used with wind and tide gauge measurements to assess the impacts of storms on beaches and coastal dunes, and particularly of the series of major storms that hit western Europe during the fall and early winter of 2013. Our results show a high variability in shoreline response from one site to the other, but also within each coastal site. Coastal dune erosion and shoreline retreat occurred at both sites, particularly on the coast of the Bay of Wissant where shoreline retreat up to about 40 m was measured. However, stability or even shoreline advance were also observed despite the occurrence of an extreme water level with a return period >100 years during the storm Xaver in early December 2013. Comparison of shoreline change with variations of coastal dune and upper beach volumes revealed only weak relationships. Our results nevertheless showed that shoreline behavior seems to strongly depend on the initial sediment volume on the upper beach before the occurrence of the storms. According to our measurements, an upper beach volume of about 30 m3 m−1 between the dune toe and the mean high water level is sufficient at these sites to protect the coastal dunes from storm waves associated with high water levels with return periods >10 years. The identification of such thresholds in terms of upper beach width or sediment volume may represent valuable information for improving the management of shoreline change by providing an estimate of the minimum quantity of sand on the upper beach necessary to ensure shoreline stability in this region. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

“…The accretion of beaches is supplied by sandy sediment sources derived from the adjacent rivers and inner continental shelf. Substantial littoral transport mechanisms are required for the transfer of material to the beach from these locations or to relocate the material back to the continental shelf (Cartier & Héquette, 2015).…”

Section: Introductionmentioning

confidence: 99%

Coastal dynamics on equatorial beaches of amazonian coast during extreme tide events

Ranieri

Rosário²,

Tritinger³

et al. 2022

PESQUI GEOCIENC

View full text Add to dashboard Cite

This paper describes the influence of tidal currents on sediment transport on Amazonian equatorial beaches during extreme events. The study area (Salinópolis city) was divided into two sectors: western (Sampaio tidal channel) and eastern (Atalaia Island). Field surveys were conducted in 2013 during two periods of highest tides: April (the rainy season) and October (the less rainy season and Spring Equinox). The optical backscatter sensors (tide, turbidity, and wave data) and current meter sensors (velocity field data) were programmed to collect data every 0.1 and 60 seconds, respectively. They operated together for 24/12 hours on the upper shoreface (surf zone). Wave heights were higher in the Atalaia Island (up to 1 meter during the less rainy season). The currents were stronger, reaching 1.2 m.s-1, during ebb tide in the rainy season (Sampaio tidal channel). Higher turbidity values (maximum 1,200 FTU) occurred at the Atalaia Island during the less rainy season. The coastal dynamics in the area derives mostly from the Amazonian continental shelf, where intense tidal currents interact with a high volume of particulate debris, especially fine sand in Salinópolis. Nevertheless, estuaries and tidal channels are also largely responsible for sediment supply and play a key role in shoreline stability and coastal transport, especially during extreme tide events.

show abstract

Vertical distribution of longshore sediment transport on barred macrotidal beaches, northern France

Cited by 16 publications

References 48 publications

The Effects of Tidal Translation on Wave and Current Dynamics on a Barred Macrotidal Beach, Northern France

The Effects of Tidal Translation on Wave and Current Dynamics on a Barred Macrotidal Beach, Northern France

Variations in the response of the dune coast of northern France to major storms as a function of available beach sediment volume

Coastal dynamics on equatorial beaches of amazonian coast during extreme tide events

Contact Info

Product

Resources

About