Use of Sentinel 2 – MSI for water quality monitoring at Alqueva reservoir, Portugal
2018
Abstract. Alqueva reservoir located in southeast of Portugal has a surface area of
250 km 2 and total capacity of 4150 hm 3 . Since 2006 the water
quality of this reservoir is explored by the authors using remote sensing
techniques. First using MERIS multi-spectral radiometer on-board of ENVISAT-1
and presently with MSI multi-spectral radiometer on-board SENTINEL-2. The
existence of two satellites (A and B) equipped with MSI enable the area to be
revisited, under the same viewing conditions, every 2–3 days. Since 2017 the
multidisciplinary project ALOP (ALentejo Observation and Prediction systems)
expands the team knowledge about the physical and bio-chemical properties of
the reservoir. This project includes an integrated field campaign at
different experimental sites in the reservoir and its shores, at least until
September 2018. Previous algorithms developed by the team for MERIS are
tested with the new MSI instrument for water turbidity, chlorophyll a
concentration and density of cyanobacteria. Results from micro-algae bloom
occurred in late summer/early autumn 2017 on the reservoir are presented,
showing the capabilities of MSI sensor for detection and high resolution
mapping over the reservoir. The results are compared with in situ sampling
and laboratorial analysis of chlorophyll a associated with the bloom.
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