ANA Brasília UnB Brasília UFF Niteroí UFRJ Rio de Janeiro SENAMHI La Paz UMSA La Paz SENAMHI Lima UNALM Lima INAMHI Quito Recent progress in estimating.

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ANA Brasília UnB Brasília UFF Niteroí UFRJ Rio de Janeiro SENAMHI La Paz UMSA La Paz SENAMHI Lima UNALM Lima INAMHI Quito Recent progress in estimating suspended sediment yield variability in the Amazon river Jean Loup GUYOT, Naziano FILIZOLA, Alain LARAQUE, Benoit LE GUENNEC, Eurides de OLIVEIRA, Francis SONDAG, Frédérique SEYLER, Geraldo BOAVENTURA, Gérard COCHONNEAU, Gutemberg SILVA, Jacques CALLEDE, Jean Michel MARTINEZ, João Bosco ALFENAS, Josyane RONCHAIL, Julien NICOD, Laurence MAURICE-BOURGOIN, Marcos RIOS, Marie Paule BONNET, Michel MOLINIER, Pascal FRAIZY, Pascal KOSUTH, Patricia MOREIRA-TURCQ, Patrick SEYLER, Philippe VAUCHEL, Reginaldo LONGUINHOS, Valdemar GUIMARAES

Gauging stations national networks In the Amazon basin

Discharge measurements in Amazonian rivers : Rating curves corrections to estimate discharge

Meade et al., Environ. Geol. Water Sci., 18 Filizola PhD Toulouse Backwater effects in Amazonian rivers : Rating curves corrections to estimate discharge

Backwater effects in Amazonian rivers : Rating curves corrections to estimate discharge Q = f(H), Q = f(H, dH/dt), Q = f(H, dH/dL) Vauchel HYDRACCESS On line data : Cochonneau et al LBA, Brasilia, Poster

Surface sampling every 10 days Section sampling every 2 – 6 months Seasonal suspended sediment variability in the Amazon basin : HiBAm Reference Stations

Rio Beni - Rurrenabaque (Bolivia)

Rio Amazonas - Óbidos (Brasil)

Seasonal suspended sediment variability in the Amazon basin : QS = f(Q) not valid in many cases

Suspended sediment variability in the large amazonian river sections : Sampling strategy Filizola et al Hydrological Sciences Journal, 49

Suspended sediment variability in the large Amazonian river sections Suspended sediment vertical distribution is a function of discharge Filizola et al Hydrological Sciences Journal, 49

Suspended sediment variability in the large Amazonian river sections The maximum suspended sediment yield is not located near the bottom river Filizola et al Hydrological Sciences Journal, 49

QS Ar = Q *  [MES] i / n* C QS Ve =  A i * V i * [MES] i * C QS In =  qc * [MES] cel * C with [MES] i = f(dB) i with [MES] i = f(dB) i Cochonneau MESAD Suspended sediment variability in the large amazonian river sections : calculating yields from on-line WHYBAM database using MESAD

Seasonal suspended sediment yield variability : calculating total suspended sediment from decadal surface sampling and section exploration using HYDRACCESS 1995 – 2003 period : t/yr

Seasonal suspended sediment yield variability : Perspectives 1. using MODIS data for monitoring surface suspended sediment 2. using 1D hydrodynamic model to estimate total suspended sediment transport Martinez et al LBA, Brasilia Le Guennec et al LBA, Brasilia

Várzea de Curuaí Laguna Granja ? ? Sediment budget in the Amazonian floodplain Large scale hydrological budget : 3 to 6 mm/yr (Filizola et al., LBA Brasilia) Hydrodynamic model on the Varzea de Curuai : 0.6 mm/yr (Maurice-Bourgoin et al., LBA Brasilia) Pb 210 sedimentation rates in the Varzea de Curuai : 5 to 10 mm/yr (Moreira-Turcq et al., Palaeogeography, Palaeoclimatology, Palaeoecology)