FIGURE 6
IGN has imported suspended sediments brought by the flood tide to
Araguari River during the dry season. Thus, the input and output mass
balance between URU1 and URU2 has shown sediment accumulation in the
floodplain (approximately 6,679 t tidal cycle-1)
(Figure 7A). Part of these sediments was likely transported to
Gurijuba-Igarapé Novo Channel and, again, to Araguari River (Figure 7A).
Qss balance between Araguari River and Urucurituba
Channel has shown insignificant SSC contribution
upstream river (ARA1) in comparison to the load carried downstream,
since the river has clear water and solids get retained by three series
of dams (Santos and Cunha, 2015). Therefore, the main sources of solids
in lower Araguari River come from URU1 and from Igarapé Tabaco region
(Figure 7A). Thus, most sediment load is transported from these two
areas via ARA2 during ebb tides.