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Remote Sens. 2018, 10(1), 49; https://doi.org/10.3390/rs10010049

Assessing the Performance of a Low-Cost Method for Video-Monitoring the Water Surface and Bed Level in the Swash Zone of Natural Beaches

1
Departamento de Obras Civiles, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
2
IRD-LEGOS, Laboratoire d’Études en Géophysique et Océanographie Spatiales, UMR 5566, CNRS/IRD/UPS, Observatoire Midi-Pyrénées (OMP), Toulouse 31400, France
3
Centro Nacional de Investigación para la Gestión Integrada de Desastres Naturales, CONICYT/FONDAP/1511007, Santiago 7820436, Chile
4
CCTVal-Centro Científico Tecnológico de Valparaíso, Valparaíso 2390123, Chile
5
Research Unit for Water, Environment and Infrastructure Resilience (WEIR), University of Bath, Bath BA2 7AY, UK
6
CNES-LEGOS, Laboratoire d’Études en Géophysique et Océanographie Spatiales, UMR 5566, CNRS/IRD/UPS, Observatoire Midi-Pyrénées (OMP), Toulouse 31400, France
7
Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 8 December 2017 / Accepted: 23 December 2017 / Published: 2 January 2018
(This article belongs to the Special Issue Instruments and Methods for Ocean Observation and Monitoring)
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Abstract

A method to continuously measure bed and water levels along a cross-shore transect of vertical poles is evaluated. This remote sensing based method uses video imagery of swash flows propagating past an array of vertical poles buried on the beach face. Using datasets collected at two beaches in Chile, the method is compared against measurements obtained with conventional co-localized instruments: LiDAR and ultrasonic distance meters. The present video swash pole technique shows good skill in retrieving swash zone bed level and water levels, while providing the possibility to measure morphological variations at time scales varying from wave groups (tens of seconds) to hours. Discrepancies between video and ultrasonic distance meters are found when short time scales are used, for both depositional and erosion events, but longer duration trends are captured well. Water surface elevations at the wave-by-wave scale proved to be accurate for the backwash phase (root-mean-sqaure-error, RMSE down to 0.028 m, R 2 up to 0.89), when compared against LiDAR. However, discrepancies have been found during the uprush phase (RMSE up to 0.062 m, R 2 down to 0.71), when the influence of the pole on the swash flow generates an overestimation of the water surface. Overall, owing to its simplicity of deployment, low cost and reasonable accuracy, the technique is considered suitable for swash studies. View Full-Text
Keywords: video swash pole; image processing; swash zone dynamics; shore face; LiDAR; ultrasonic distance meter video swash pole; image processing; swash zone dynamics; shore face; LiDAR; ultrasonic distance meter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ibaceta, R.; Almar, R.; Catalán, P.A.; Blenkinsopp, C.E.; Almeida, L.P.; Cienfuegos, R. Assessing the Performance of a Low-Cost Method for Video-Monitoring the Water Surface and Bed Level in the Swash Zone of Natural Beaches. Remote Sens. 2018, 10, 49.

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