Observations of the swash zone on a gravel beach during a storm using a laser-scanner (Lidar)

Luis Pedro Almeida, G. Masselink, P.E. Russell, M Davidson, Timothy Poate, Robert Mccall, C Blenkinsopp, I.L. Turner

Research output: Contribution to journalArticle

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Abstract

The collection of detailed field measurements from the swash zone during storms is an extremely challenging task which is difficult to execute with traditional in-situ deployments (e.g., scaffold rigs with instruments). The levels of difficulty increase for gravel beaches where the wave energy reaches the beach face with almost no loss of energy,leading to violent plunging wave breaking on the beach face that can produce large vertical morphological changes and extremely strong uprushes that can easily and rapidly damage, bury or detach instrumentation. Remote-sensing techniques emerge as the most appropriate solution to perform field measurements under such adverse conditions since they have the ability to perform measurements without being deployed in-situ. A mid-range (~ 50 m) Laser-scanner mounted on a tower (~ 7 m high) in the mid beach face of a gravel beach (Loe Bar - SW England) was used to measure bed-level changes and runup at a sampling rate of 2 Hz along one beach profile during a storm. The results from the comparison of this system with other state-of-the-art instruments (e.g., ultrasonic bed level sensors, GPS and video cameras) indicate that the quality of the measurements obtained is within the accuracy of the standard methods. The advantages of this system is the reduced logistical infrastructure required for the deployment, the capability to perform surveys with high spatial and vertical resolution, during day and night, and to reach areas of the swash zone where no other instrument can be deployed safely. Measurements performed with a laser-scanner on a gravel beach (Loe Bar) show complex and fast-changing morphology on the gravel beach, which appears to be a form of negative morphodynamic feedback to controls the hydrodynamic evolution in the swash zone.
LanguageEnglish
Pages636-641
Number of pages6
JournalJournal of Coastal Research
VolumeSI 65
DOIs
StatusPublished - Apr 2013

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wave runup
scanner
lidar
gravel
beach
laser
beach profile
wave breaking
morphodynamics
wave energy
instrumentation
GPS
hydrodynamics
infrastructure
sensor
remote sensing
damage
sampling
energy

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Almeida, L. P., Masselink, G., Russell, P. E., Davidson, M., Poate, T., Mccall, R., ... Turner, I. L. (2013). Observations of the swash zone on a gravel beach during a storm using a laser-scanner (Lidar). Journal of Coastal Research, SI 65, 636-641. https://doi.org/10.2112/SI65-108.1

Observations of the swash zone on a gravel beach during a storm using a laser-scanner (Lidar). / Almeida, Luis Pedro; Masselink, G.; Russell, P.E.; Davidson, M; Poate, Timothy; Mccall, Robert; Blenkinsopp, C; Turner, I.L.

In: Journal of Coastal Research, Vol. SI 65, 04.2013, p. 636-641.

Research output: Contribution to journalArticle

Almeida, LP, Masselink, G, Russell, PE, Davidson, M, Poate, T, Mccall, R, Blenkinsopp, C & Turner, IL 2013, 'Observations of the swash zone on a gravel beach during a storm using a laser-scanner (Lidar)' Journal of Coastal Research, vol. SI 65, pp. 636-641. https://doi.org/10.2112/SI65-108.1
Almeida, Luis Pedro ; Masselink, G. ; Russell, P.E. ; Davidson, M ; Poate, Timothy ; Mccall, Robert ; Blenkinsopp, C ; Turner, I.L. / Observations of the swash zone on a gravel beach during a storm using a laser-scanner (Lidar). In: Journal of Coastal Research. 2013 ; Vol. SI 65. pp. 636-641.
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