The recorded by the optical system coastline of Kamari beach, was compared with 3 different coastlines that were extracted from the available satellite image of the same date, with the use of 3 different NDWI coefficients. Results showed that when a value of 0.5 is used as NDWI coefficient, the coastline extracted from the satellite image and the one recorded by the optical system show exceptional accuracy.
Comparison of the coastline of Kamari beach as was recorded by the costal video monitoring system, with 3 different coastlines extracted from a satellite image of the same date under 3 different NDWI coefficients
Coastline evolution for the whole monitoring period is shown in the figure below. During this period, the beach showed high spatio-temporal coastline variability with specific beach sections show different morphological behavior (i.e. erosion of the northern studied part of the beach of ~ 20 m followed by similar accretion of the southern part).
Analysis of the temporal coastline evolution (mean daily coastlines) of Kamari beach at 10 selected cross-shore sections (x1, x2, …, x10) for the period of 26 June – 31 December 2016. No data are represented for the period of 06 July – 15 December 2016 due to vandalism of the cameras. a) Coastline position at 26 June 2016, 11:00. b) Coastline position at 31 December 2016, 11:00. c) Schematic representation of the 10 cross-shore sections used in analysis upon a representative TIMEX mosaic of 29th June 2016. The mean, min and max coastline positions for the duration of the monitoring period are depicted. d) Standard deviation of the coastline position for the studied beach length. e) like d), depicting the difference (in meters) between the extreme (Min/Max) positions of the coastline. f) Temporal evolution of the mean daily coastline position in the 10 cross-shore sections shown in c)
