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. 2019 Feb 22;19(4):936. doi: 10.3390/s19040936

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Deployment of the mini-Secchi disk by a surfer. (a) Location of Playa Langosta in Costa Rica. (b) Data collected using the mini-Secchi disk (Secchi-depth and FU colour scale) between 28th February and 4th March 2013 at Playa Langosta. Wind speed data from nearby weather station (Sede de Guanacaste, Liberia) and wave height data at Langosta (using wave model forced with observations) are also shown. Uncertainties (error bars) for the Secchi depth and wind speed are based on standard deviations of measurements during the surfing session (5–7 for the Secchi depth), or around local noon for wind speed for the days of no deployment. Uncertainties (error bars) in wave height represent the range in wave heights from the wave model data. Uncertainties (error bars) in FU colour scale were set to half an FU number based on reproducibility results in Wernand and van der Woerd [5]. (c) Photos taken of the surfer at Playa Langosta in Costa Rica on the 28th February (Day 59) and 3th March (Day 62).