Estudo da influência da salinidade na velocidade de sedimentação de partículas finas (silte e argila) na coluna de água

Abstract

This study was conducted to understand the effect of salinity on sedimentation and vertical transport of sediments in the water column. The cohesive sediments are divided in different size in which the sedimentation velocity of each particle vary, due to the level of salinity can behave with a settling velocity by several chemical factors, since there is a need to understand how at the level of salinity influence the sedimentation of each size. For this purpose, four different water bodies with different salinity levels were used which contained a quantity of cohesive sediments of size (0.05mm to 0.002mm) to determine the sedimentation time in each beaker. For each diameter deposited at different salinity levels it was estimated the sedimentation velocity of each diameter through the results obtained by Stoke's Law and the amount of sediment in sedimentation. The pipetting method was able to collect each size of cohesive sediments at different salinity levels to estimate sedimentation velocity compared to the amount of sediment of each size. With the increase in salinity level it was observed that the sedimentation velocity of the particle sizes was higher due to the electropositive charges between the salts and the cohesive sediments, where these particles are neutralized to the bottom and can overcome the density of the fluid.