Morphodynamics of the Madeira River in Brazil Christine Bonthius The University of Texas at Austin Department of Geography and the Environment

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Presentation transcript:

Morphodynamics of the Madeira River in Brazil Christine Bonthius The University of Texas at Austin Department of Geography and the Environment

Goals of Term Project  Inventory hydraulic variables from ADCP data  Analyze preliminary results for geomorphic and hydraulic relationships  Inform plans for field work (December 2012)

The Madeira River in Brazil Average Annual Discharge: 32,000 m³/sec Drainage Area: 1.36 million km² Average Annual Sediment Yield: 330 tons/km² per year (Latrubesse, 2008)

Dams on the Madeira River (Moreira 2007) (InternationalRivers.org)

ADCP Processing Above: Maximum depths (shown in red) are found in the meandering stretch and correspond to the narrowest sections of the channel. Below: WinRiver II transect profiles (15 and 18, respectively) reveal differences in channel shape, bathymetric forms, and suspended sediment and water velocity distributions. Above: Transect 24 in the meandering reach shows turbulent secondary flow structures in the deepest section (approximately 40 m) with the highest flow velocity. Below: Transect 58 at the end of the anabranching reach shows remnant bathymetry of the island upstream. About 25% of the channel seems to be inactivated with little water velocity. In the middle of the channel, the highest water velocities penetrate even to the bottom of the channel.

Building the Database Data outputs from ADCP processing were entered into an Excel table, then joined to the ADCP transect shapefile

Current Analysis Meandering Reach Transects Box-Curve Reach Transects Anabranching Reach Transects Hydraulic Variable Reach 1Reach 2Reach 3 Average Depth (m) Average Max Depth (m) Average Discharge (m³/sec) Average Width (m) Average w/d ratio

Current Analysis Spatial Distributions of Velocity and Channel Widths in the Study Reach Reach 1 Reach 2 Reach 3 River Channel (km)

Geomorphic Mapping Major geomorphic units include: - Fluvial terraces with little to no dissection (A212, A222) -Fluvial plains in channel and floodplain area (A31) Units constraining the lateral movement of the channel are remnant terraces

Future Work  Delineation of direct and indirect effects of dams (SRTM)  Evaluation of transboundary watershed issues (Bolivia)  More field work in December with Latrubesse Research Group