Temporal variations of temperature, salinity and circulation in the Peruípe river estuary (nova Viçosa, BA)

Abstract

Eulerian profiles of thermohaline properties and currents have been sampled in the Peruípe River Estuary (Nova Viçosa, BA), southern region of the Caravelas-Peruípe Rivers Estuarine System. One station was located near the mouth (C) and other one up the estuary (E). The Hansen-Rattray diagram classification of the upper reaches of the Peruípe river estuary in the wet season changed from Type 2b (partially mixed and highly stratified  =0.88) to Type 1b (highly stratified  ~1.00) due to the fortnightly tidal modulation. This region was mainly forced by river discharge (Ri E =5.7 and Ri E =4.1) and characterized by high (Ri L >20) and low stabilities (Ri L <20) in the neap and spring tidal cycles. However, near the mouth stratification was strongly modulated by the tide, and its classification alternates from being highly stratified (Type 2b  =0.92) in the neap tide to being well mixed with low stratification (Type 1a  =1.00); the mouth was dominated by fresh water discharge (Ri E =12.9) and tidal stirring (Ri E =0.6) in the neap and spring tide, respectively, and were associated with high and low stabilities. The classical steady-state salinity and velocity profiles show good agreement (Skill~1.0) with the corresponding observational profiles when simulated with

Physical characteristics and discharges of suspended particulate matter at the continent-ocean interface in an estuary located in a semiarid region in northeastern Brazil

“…This pattern was not observed in the Jaguaribe River estuary in the rainy season because the zone of mixing had been advected beyond the estuary to the ICS. Andutta et al (2013) reported that the Peruípe River estuary, located in the state of Bahia, Brazil, displayed behavior similar to that of the Jaguaribe River estuary, where the river flows dominate the estuary discharges only in the rainy season.…”

Enhanced Exchange Flow During Spring Tide and Its Cause in the Sumjin River Estuary, Korea

“…To quantify the performance of the model results, the skill parameter was used (Willmott 1981;Warner et al 2005;Zhong and Li 2006;Vaz et al 2007;Andutta et al 2013;Toublanc et al 2015):…”

Hydrodynamics of a tropical estuary: Buranhém River, Porto Seguro, Brazil

“…The baroclinic gradient pressure force is important. Similarly to the studies of Andutta et al (2013) and Cavalcante et al (2017), advection and diffusion contributed to the net up-estuary salt flux.…”

“…Residual current was unidirectional and seaward (Figure 8), which is a characteristic of a well-mixed estuary (ANDUTTA et al, 2013) and influenced by the large mangrove areas that are able to store a large volume of water (e.g. WOLANSKI, 1992;MAZDA et al, 1995;RIGO, 2004;ASP et al, 2012;GOMES et al, 2013).…”

“…In this region, the Caravelas, Peruípe and Itanhém estuaries have been relatively well studied (e.g. PEREIRA et al, 2010;ANDUTTA et al, 2013;PAIVA et al, 2016). These studies show the tide dominance in governing the estuarine processes, resulting in well mixed estuaries.…”