Study of the variability in suspended sediment discharge at Manacapuru, Amazon River, Brazil

the manacapuru hydrometric gauge station has been used for more than 30 years by the brazilian national hydrometric network to provide data on the solim？es- amazon river. at this place, the solim？es river average water discharge is about 103,000 m3 s-1, the mean width is 3,000 m and the mean depth is 20 m. the gauge station record represents the whole upstream contribution of the total suspended solids (tss) from the solim？es basin, whose total area is approximately 2 x 106 km2, representing a runoff of 0.48 m3 s-1 km-2. tss annual flow is approximately 400 x 106 t. the systematic tss sampling procedures traditionally used at the brazilian hydrometric network has limitations, some of them being related to local effects affecting the tss flow. this article aims to study the local variability of tss flow at manacapuru station. the study was conducted in the scope of mesasol and piatam iv projects, whose objectives are precisely to consider alternative methods for tss flow assessment in the amazon basin. it was identified that local geologic-geomorphologic features are related with the tss flux spatial variability at the vicinity of the manacapuru section. this results induce a new interpretation to the general sediment flux for the solim？es river basin, were local flux can’t be see as a total flux from the hole up-stream river basin.