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Occupational accidents are a complex phenomenon and a major public health problem that requires attention from all sectors, including healthcare, industry or services, because these accidents generate high socioeconomic costs. 1 Work that is carried out under unsuitable conditions can cause various adverse consequences for humans, both physically and psychologically. These consequences may give rise to impairments that lead to absenteeism, premature retirement, reduced income, job disruption for the family, temporary incapacitation, physical or psychological pain, mutilation and even death. Faced with this reality, it is essential that this topic is discussed in order to conduct studies that show the unfavorable impacts of work on workers' health. 2,3 One of the main causes of health problems among workers is the fragility of the health and safety structure, along with inadequate risk management. 4 In order to implement care, surveillance, preventive actions and health promotion actions, the National Network for Integral Attention to Worker's Health (RENAST) 5 was created in Brazil in 2002. This is a complex network that includes production and management of knowledge and actions to be developed for workers' health. The network is composed of state and regional reference centers for occupational health (CERESTs) that have the objective of acting towards health promotion, preventive actions, surveillance, assistance and rehabilitation relating to workers' health in both urban and rural settings, irrespective of employment relationships and the type of status in the labor market. 6 All work accidents must be reported in the notifiable hazards information system (Sistema de Informação de Agravos de Notificação, SINAN). This system has been implemented gradually since 1993 and is mainly fed by notifications and investigations of cases of diseases and injuries that are listed as matters for compulsory notification. When used effectively, this system makes it possible to identify the epidemiological reality of a given geographical area. 7 In the case of accidents among workers who are insured through social security, it is necessary to open a work accident notice (Comunicação de Acidente de Trabalho, CAT

Estuaries are dynamic environments that are highly vulnerable to anthropogenic influences, especially when adjacent to urban areas. In this study it is assessed for the first time the hydrodynamic characteristics of the Buranhém estuary (Northeast Brazil). The aim is to define the salt transport mechanisms and the hydrodynamics and stratification patterns of this tropical estuary, under both spring and neap tidal conditions. Fieldwork was carried out during 8 days covering varying tidal range conditions (July 30 th to August 7 th , 2015). Salinity and temperature were continuously monitored at moored stations at both the surface and bottom, whereas velocity profile was sampled by a bottom-mounted instrument. Average velocity in the water column was 0.46 m.s -1 during flood tides and 1.0 m.s -1 during ebb tides. Residual currents were seaward, with ebb dominance. The dominant salt transport mechanism is turbulent diffusion. Most of the layer Richardson values did not exceed 2, indicating well mixed conditions mainly during spring tides. Stratification varies with tide condition, with spring tides being able to further mix the vertical structure. Vertical velocity gradients that generate vertical mixing overcome the stabilizing effects generated by vertical density gradients.

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