Avaliação do fluxo de sedimentos em suspensão na região do Porto de Quelimane no estuário de Bons Sinais província da Zambézia

Abstract

The Bons Sinais estuary is affected by the discharges of the Cuácua and Licuari rivers. According to Gimo (2015) the Cuácua River is responsible for the largest discharge of sediments in the mouth, these discharges have contributed to the development of many sand banks along the estuary. In total there are six banks, three of which are situated towards the mouth of the estuary, two towards the confluence of the Cuácua and licuari rivers and one in front of the Port of Quelimane. Work has not yet been done to justify the dependence of the bank in front of Oporto. Fieldwork in two phases of tide (live and dead) was carried out in front of the reef bench located in front of the port of Carga in order to evaluate the sediment flow and finally to identify the origin of the sediments feeding the bank . For this, samples of surface water were collected at one hour intervals, water velocity data, tidal variation data were collected and finally the topographic profile was taken. Results found indicate that the highest and lowest concentrations of sediment (0.1378 g / L and 0.0358 g / l) in the live and dead tide phases were observed at the study site. The highest and lowest observed flow was 20,558.3 kg / s and 14.68 kg / s, respectively, during the live and dead tide phases respectively. From the inflow of the inflow and outflow, they note that the source of sediments feeding the bank comes from the sea side. This quantity is of considerable concern given the irregularity of dredging that has occurred in the canal giving access to the port, and it is suggested that the competent authorities create conditions so that there is regularity in the dredging process of the site.