%0 Journal Article
%T Study of the variability in suspended sediment discharge at Manacapuru, Amazon River, Brazil
%A Naziano Filizola
%A Frederique Seyler
%A Maria Helena Mour£¿o
%A Warley Arruda
%J Latin American Journal of Sedimentology and Basin Analysis
%D 2009
%I Asociaci¨®n Argentina de Sedimentolog¨ªa
%X 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 10(6) km2, representing a runoff of 0.48 m3 s-1 km-2. TSS annual flow is approximately 400 x 10(6) 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. A esta  o hidrom¨¦trica de Manacapuru ¨¦ uma localidade utilizada h¨¢ mais de 30 anos na rede hidrom¨¦trica brasileira. Esta esta  o, cuja se  o transversal sobre o Rio Solim es, tem em m¨¦dia: 3000 metros de largura e 20 metros de profundidade, controla praticamente a totalidade das contribui  es das MES (Material Em Suspens o) oriundos da bacia do Rio Solim es, cuja ¨¢rea total ¨¦ de aproximadamente 2 milh es de km2, a descarga l¨ªquida m¨¦dia ¨¦ de 103.000 m3 s-1, ou 48 l s-1 km-2. O fluxo m¨¦dio total anual de MES ¨¦ de aproximadamente 400 x 10(6) toneladas. A sistem¨¢tica tradicional de amostragem de material em suspens o (MES) tem limita  es quanto a avaliar efeitos locais nesse fluxo. O presente artigo pretende apresentar alguns fen menos locais que de algum modo interferem no fluxo local de MES do Rio Solim es em Manacapuru. O estudo foi realizado no escopo do Projeto MESASOL e PIATAM IV, projetos que t¨ºm investigado m¨¦todos alternativos de avalia  o do fluxo de MES na bacia Amaz nica na busca de melhorar a precis o e diminuir os custos operacionais na aquisi  o de dados hidrol¨®gicos. Os resultados indicam que as caracter¨ªsticas geol¨®gicas e geomorfol¨®gicas locais influenciam no fluxo de MES, com grande variabilidade espacial
%K Sedimentos em suspens o
%K Perfilador Ac¨²stico de Corrente
%K Rio Amazonas
%K Suspended sediments
%K Acoustic Doppler Profiler
%K Amazon River
%U http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-49792009000200003