“…This river is 1,155 km long and drains an area of 55400 km² (Coelho, 2012), and its estuary has a surface area of 21.5 km², an average depth of 2 m, a 43.1 × 106 m³ volume and a hydraulic residence time of 0.75 days (Sterza, Fernandes, 2006;Cotovicz Jr., et al, 2013). The morphosedimentary design of the RSP estuary is dominated by waves (Oliveira, 2015), and this estuary is located in a humid tropical climate and subject to a semidiurnal micro-tidal regime (Nicolite, 2009;Bernardes et al, 2012, Alvares, et al, 2013. According to Cotovicz Jr. et al (2013), approximately 46.1% of the RSP estuary area is composed of fresh water, 33.2% of brackish water and 20.7% of saline water, but these values can be changed between dry and rainy season.…”