Hidrodinâmica e fluxo de sedimentos suspensos sob influência de maré no bairro dos pescadores no estuário dos bons sinais, Zambézia - Quelimane

Abstract

This study aims to study the hydrodynamic and flow characteristics of suspended sediments in the Bons Sinais estuary in the fishermen's neighborhood. This work was carried out in three phases, the first phase was field data collection during the live and dead tide of June 15 and July 10, 2018 in the dry season, where the bathymetric profile was carried from one bank to another. In an area corresponding to 237𝑚2. with an average depth of 11.9 meters in the tidal period, the second phase consisted of laboratory analysis and third in data processing. Laboratory analyzes were carried out at the marine chemistry laboratory at Escmc, where the collected samples were analyzed and the suspended sediment concentration results were obtained. Data processing was performed using the Matlab r2007b software, where the tide data, Suspended sediment concentration, Suspended sediment flow, current, topography and statistical parameter calculations were processed. Where at high tide tidal height reached its maximum peak of 4 meters and at low tide peaked at 3 meters, At high tide the maximum suspended sediment flow values were 27,316 [kg / s] (ebb) and 53,555 [ kg / s] (flood), with a corresponding balance 26,239 [kg / s] in this period. During the ebb tide the sediment flow values were 30,846 [kg / s] (flood) and 25,839 [kg / s] (ebb), with a sediment balance of 5,007 [kg / s]. Comparing the two phases of the tide it was observed that in the living tide there was greater sediment flow to the Estuary. Correlation of tidal heights with sediment concentration and flow showed that the relationship is very strong with coefficient of variation (R ^ 2 = 0. 97 and R ^ 2 = 0.9086) during the live tide. and (R 2 = 0.9086 and R 2 = 0.9567) during the ebb tide. The largest sediment flow in the live and dead tide is of marine origin.