Short-Term Beach and Shoreface Evolution on a Cuspate Foreland Observed with Airborne Topographic and Bathymetric LIDAR

Xhardé, Régis; Long, Bernard; Forbes, Donald L.

doi:10.2112/si_62_6

Cited by 19 publications

(18 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1, left). This area is a fetchlimited low wave-energy site characterized by a significant wave height of 0.95 m, a peak period of 4.1 s and extreme values of 3.38 m (H max ) and 10 s (T max ) (Xhardé et al 2010). The dominant wave directions are respectively to the west (27.7 % of the time), to the east (13.9 %) and to the northeast (11.6%).…”

Section: Study Areamentioning

confidence: 99%

“…The dominant wave directions are respectively to the west (27.7 % of the time), to the east (13.9 %) and to the northeast (11.6%). Storm waves with H s exceeding 2 m are mainly originating from the northeast (Gulf of SaintLawrence) and from the southwest (Xhardé et al 2010). The limit of wave action is approximately 5 m (2H s ) but wave-generated currents can reworked the seabed to depths of at least 14 m during major storm events (Cottin 2008, Xhardé 2010.…”

Section: Study Areamentioning

confidence: 99%

“…Storm waves with H s exceeding 2 m are mainly originating from the northeast (Gulf of SaintLawrence) and from the southwest (Xhardé et al 2010). The limit of wave action is approximately 5 m (2H s ) but wave-generated currents can reworked the seabed to depths of at least 14 m during major storm events (Cottin 2008, Xhardé 2010. Tides are meso-tidal (spring tide range = 2m) and tide currents don't exceed 1 knot (~50 cm/s) according to the Canadian Hydrographic Survey (2006).…”

Section: Study Areamentioning

confidence: 99%

“…This foreland is the emerged part of a larger submarine sedimentary structure of approximately 3 km long and 1.2 km wide (~ 3.6 km²) extending to a depth of 14 m (Fig. 1, right) forming the end of the local coastal sediment transport (Renaud 2000, Xhardé et al 2010. East of the foreland, the offshore bathymetry exhibited semi-regular shore-oblique subtidal dunes which appeared to be part of a field of overlapping dunes covering an area of about 360000 m² and were located at depths ranging from 5 m to 14 m (Cottin 2008, Xhardé et al 2010.…”

Section: Study Areamentioning

confidence: 99%

“…Airborne LiDAR bathymetry (ALB) has proven to be an efficient laser-based tool to monitor coastal environments and to map biological habitats (Collin et al 2008(Collin et al , 2010 or geomorphology (Cottin et al 2009, Xhardé et al, 2010. In this study, the possibility to get sedimentological (porosity, compaction) and hydrodynamical (suspended sediment concentration, turbulence) information from ALB surveys was investigated.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Airborne Lidar Bathymetry Applied to Coastal Hydrodynamic Processes

Long¹,

Aucoin²,

Montreuil³

et al. 2011

Int. Conf. Coastal. Eng.

Self Cite

View full text Add to dashboard Cite

In this study, the possibility to get sedimentological (density, compaction) and hydrodynamical (suspended sediment concentration, turbulence) information from ALB surveys is demonstrated. ALB laser reflectance was found to be higher on the lee-side and on the crest of the ripple bedform than in the trough and on the stoss-side. Moreover, laser reflectance was also found to be higher on "active" subtidal dunes, located within the depth of action of the waves, than on deeper "passive" bedforms. Based on lab experiments conducted in a hydraulic flume under X-ray CT-Scanner, these observations were related to sediment compaction and suspended sediment.

show abstract

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Airborne Lidar Bathymetry Applied to Coastal Hydrodynamic Processes

Long¹,

Aucoin²,

Montreuil³

et al. 2011

Int. Conf. Coastal. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

The morphodynamics of transverse dunes on the coast of South Africa

Knight

Burningham²

2021

Geo-Mar Lett

View full text Add to dashboard Cite

Transverse sand dunes located within the supratidal zones of beaches are a significant geomorphic feature along sand-dominated coasts worldwide, and are generated by strong alongshore winds in areas of high sediment availability. Transverse dunes are present along the South African coast and these are known to migrate dynamically in response to wind forcing. However, the detailed dynamics of individual dune systems along the same coastal stretch have not been compared to one another, and the relationship of transverse dunes to their hosting beach systems has also not been examined. This study examines the properties and dynamics of transverse supratidal dunes from three systems along the coast of South Africa, using remote sensing methods. Results show that, although the underlying beach system appears to be relatively stable over the time period of analysis, there is a dominant aeolian-driven migration of transverse dunes towards the northeast, following prevailing wind direction, countered by less dominant movement to the southwest. There is also considerable variations in calculated annual dune migration rates between adjacent systems, between summer and winter seasons, and between dunes within a single site. This highlights that, although beach and dune landforms can be conceptually considered as part of the same sediment system, there is not a clear relationship between phases of beach aggradation and phases of dune aggradation. Instead, a primary control appears to be beachface erosion by waves that reduces beach width and influences dune morphodynamics, independent of sediment supply.

show abstract