Quick estimates of discharg

Quick estimates of discharges along the Negro River constrained by satel...
2010 Meeting of the Americas
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HR: 0800h
AN: U31A-07 Poster
TI: Quick estimates of discharges along the Negro River constrained by
satellite altimetry
AU: *Moreira, D M
EM: [email protected]
AF: COPPE/UFRJ, Rio de Janeiro, Brazil
AU: SANTOS DA SILVA, J
EM: [email protected]
AF: COPPE/UFRJ, Rio de Janeiro, Brazil
AU: Souza, A E
EM: [email protected]
AF: COPPE/UFRJ, Rio de Janeiro, Brazil
AU: Calmant, S
EM: [email protected]
AF: IRD, Brasília, Brazil
AU: Seyler, F S
EM: [email protected]
AF: IRD, Brasília, Brazil
AU: Monteiro, A
EM: [email protected]
AF: CPRM, Rio de Janeiro, Brazil
AU: Rotunno Filho, O C
EM: [email protected]
AF: COPPE/UFRJ, Rio de Janeiro, Brazil
AU: Bonnet, M
EM: [email protected]
AF: IRD, Brasília, Brazil
AB: In this study, we present a methodology to obtain discharge values along
the Negro River with short delays taking advantage of the rapid delivery of
water stages by satellite altimetry. The methodology has the following steps:
We modeled the discharges in the Rio Negro using the HEC-RAS model. Model
inputs were discharges from rating curves at gauge stations and time-varying
Manning coefficients. Indeed, following Chow (1959), temporal variations of the
Manning coefficient in a river reach can be determined as the loss of energy
due to stage and flow velocity variations at both ends of the reach. This
computation of temporal variations of the Manning coefficient requires that the
stage variations are leveled. We used various techniques to level the gauge
series, including: direct leveling of the gauge with GPS, indirect leveling from
the height of the water level at the time when a ship embarking a GPS passed
in the vicinity of the gauge and last, leveling using the regression coefficients in
the comparison between the gauge readings and water level series by radar
altimetry. The water stages in output of the HEC-RAS runs were compared
with the height series by satellite altimetry at the location of the crossing of the
river with satellite tracks to validate the runs. The discharges in output of the
HEC-RAS model at these locations were used to derive rating curves. Finally,
these rating curves are used to predict near real time discharge using the radar
altimetry heights computed from the fast delivery products provided by the
space agencies in the Interim Geophysical Data Records. Reference: Chow, V.
T., 1959, Open-channel Hydraulics, McGraw-Hill, NY, USA.
DE: [1240] GEODESY AND GRAVITY / Satellite geodesy: results
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Quick estimates of discharges along the Negro River constrained by satel...
http://www.agu.org/cgi-bin/SFgate/SFgate?language=English&verbos...
DE: [1860] HYDROLOGY / Streamflow
SC: Union (U)
MN: 2010 Meeting of the Americas
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