ANA BrasíliaUnB BrasíliaUFF NiteroíUFRJ Rio de Janeiro

SENAMHI La PazUMSA La Paz

SENAMHI LimaUNALM Lima

INAMHI Quito

Recent progress in estimating Recent progress in estimating suspended sediment yield variability suspended sediment yield variability

in the Amazon riverin the Amazon river

Jean Loup GUYOT, Naziano FILIZOLA, Alain LARAQUE,Jean Loup GUYOT, Naziano FILIZOLA, Alain LARAQUE,Benoit LE GUENNEC, Eurides de OLIVEIRA, Francis SONDAG, Benoit LE GUENNEC, Eurides de OLIVEIRA, Francis SONDAG, Frédérique SEYLER, Frédérique SEYLER,

Geraldo BOAVENTURA, Gérard COCHONNEAU, Gutemberg SILVA, Jacques CALLEDE, Geraldo BOAVENTURA, Gérard COCHONNEAU, Gutemberg SILVA, Jacques CALLEDE, Jean Michel MARTINEZ, João Bosco ALFENAS, Josyane RONCHAIL, Julien NICOD, Jean Michel MARTINEZ, João Bosco ALFENAS, Josyane RONCHAIL, Julien NICOD,

Laurence MAURICE-BOURGOIN, Marcos RIOS, Marie Paule BONNET, Michel MOLINIER, Laurence MAURICE-BOURGOIN, Marcos RIOS, Marie Paule BONNET, Michel MOLINIER, Pascal FRAIZY, Pascal KOSUTH, Patricia MOREIRA-TURCQ, Patrick SEYLER, Pascal FRAIZY, Pascal KOSUTH, Patricia MOREIRA-TURCQ, Patrick SEYLER,

Philippe VAUCHEL, Reginaldo LONGUINHOS, Valdemar GUIMARAES Philippe VAUCHEL, Reginaldo LONGUINHOS, Valdemar GUIMARAES

Gauging stations national networksIn the Amazon basin

Etalonnage de la station: GUAYARA MERINValidité: 01/01/83 à nos jours

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Jaugeages Moulinet

Jaugeages ADCP

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

Meade et al., 1991. Environ. Geol. Water Sci., 18

Filizola. 2003. PhD Toulouse

Etalonnage de CUCUI, Rio Negro

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Backwater effects in Amazonian rivers :Rating curves corrections to estimate discharge

FAZENDA VISTA ALEGRE - RIO MADEIRA

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Table d'étalonnage

Q = f(H), Q = f(H, dH/dt), Q = f(H, dH/dL)

Vauchel. 2003. HYDRACCESS

FAZENDA VISTA ALEGRE - RIO MADEIRA

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On line data :

Cochonneau et al. 2004. LBA, Brasilia, Poster

Surface sampling every 10 daysSurface sampling every 10 daysSection sampling every 2 – 6 monthsSection sampling every 2 – 6 months

Seasonal suspended sediment variability in the Amazon basin :

HiBAm Reference Stations

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Amazon river at Óbidos

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y = 0.000957x2.502

r2 = 0.809n = 833

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Seasonal suspended sediment variability in the Amazon basin :

QS = f(Q) not valid in many cases

1009585

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Suspended sediment variability in the large amazonian river sections :

Sampling strategy

Filizola et al. 2004. Hydrological Sciences Journal, 49

Suspended sediment variability in the large Amazonian river sections

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is a function of discharge

Filizola et al. 2004. Hydrological Sciences Journal, 49

Suspended sediment variability in the large Amazonian river sectionsVel.(*10-1 m.s-1)

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QSQSArAr = Q * = Q * [MES] [MES]ii / n* C / n* C

QSQSVeVe = = A Aii * V * Vii * [MES] * [MES]ii * C * C

QSQSInIn = = qc * [MES] qc * [MES]celcel * C * C

with [MES]with [MES]ii = f(dB) = f(dB)i i

Cochonneau. 2004. MESADCochonneau. 2004. MESAD

Suspended sediment variability in the large amazonian river sections :

calculating yields from on-line WHYBAM database using MESAD

y = 2,11x - 14,19

R2 = 0,89

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samplingand section exploration using HYDRACCESS

Rio Amazonas - Obidos

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1995 – 2003 period : 760 106 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. 2004. LBA, Brasilia

Le Guennec et al. 2004. LBA, Brasilia

VVáárzea de Curuarzea de Curuaíí

Laguna GranjaLaguna Granja

??

??

Sediment budget in the Amazonian floodplain

Large scale hydrological budget : 3 to 6 mm/yr (Filizola et al., 2004. Large scale hydrological budget : 3 to 6 mm/yr (Filizola et al., 2004. LBA BrasiliaLBA Brasilia))

Hydrodynamic model on the Varzea de Curuai : 0.6 mm/yr (Maurice-Bourgoin et al., 2004. Hydrodynamic model on the Varzea de Curuai : 0.6 mm/yr (Maurice-Bourgoin et al., 2004. LBA LBA BrasiliaBrasilia))

PbPb210210 sedimentation rates in the Varzea de Curuai : 5 to 10 mm/yr (Moreira-Turcq et al., 2004. sedimentation rates in the Varzea de Curuai : 5 to 10 mm/yr (Moreira-Turcq et al., 2004. Palaeogeography, Palaeoclimatology, PalaeoecologyPalaeogeography, Palaeoclimatology, Palaeoecology))