Estudo da dinâmica do banco de areia na região do porto, estuário dos bons sinais

Abstract

The port of Quelimane is in the estuary of Bons Sinais, is a port that contributes significantly to the increase of foreign exchange for the province of Zambézia, as far as the transport of goods and for the province of Zambezia. Annually it handles about 650,000 tons. This potential is being threatened due to several sandbanks existing along the estuary of the Bons Sinais. The most disturbing is the sandbank which is about 50 meters from the harbor. Information from the local community suggests that this bank tends to be closer to the mooring area. In order to evaluate the progress of this bank, the bathymetry was carried out in two phases (in July and November), followed by a monitoring of the vertical change that occurred in the period from November 2016 to August 2017. The results obtained indicate that the bank of sand tends to move towards the direction of the cargo port of Quelimane. In the bank, it can be observed that in the month of February it registered 7.38 cm in average, in May it registered a value of 8.16 in average and finally, the month of August registered 0.90 cm in average, and during the 10 months of the accomplishment of the study , the recorded variation of the sandbar was 5.5 cm in total height, and as a result, the sandbar illustrates evidence of its movement towards the commercial port of loading. These results pose a threat to the port since, despite the dredging that was carried out during the months of January to May 2017, the increase of sediment in the bank prevailed.