Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18408
Title: Spatial and temporal dynamics of river channel migration and vegetation in central Amazonian white-water floodplains by remote-sensing techniques
Authors: Peixoto, Juliana Maerschner Aguiar
Nelson, Bruce Walker
Wittmann, Florian Karl
Keywords: Alluvial Geomorphology
Annual Rates
Brazilian Amazonia
C-sequestration
Cecropia Forest
Central Amazon Basin
Channel Migration
Flood-plains
Free Channels
Landsat Tm
Local Biomass
Old-growth Forest
Open Water
Point Bar
River Channels
River Confluence
Sediment Loads
Sensing Techniques
Study Areas
Study Sites
Temporal Dynamics
Vegetation Type
Water Discharges
Biomass
Forestry
Geomorphology
Remote Sensing
Vegetation
Wetlands
Rivers
Alluvial Deposit
Biomass
Carbon Sequestration
Channel Flow
Colonization
Floodplain
Geomorphology
Landsat
Oil Trade
Old-growth Forest
Pioneer Species
Remote Sensing
River Discharge
Spatial Variation
Temporal Variation
Vegetation Dynamics
Wetland
Basins
Biomass
Carbon
Cecropia
Chelation
Forestry
Mapping
Plants
Remote Sensing
Rivers
Wetlands
Amazonia
South America
Cecropia
Issue Date: 2009
metadata.dc.publisher.journal: Remote Sensing of Environment
metadata.dc.relation.ispartof: Volume 113, Número 10, Pags. 2258-2266
Abstract: We investigated spatial and temporal migration of the Solimões, the Japurá, and the Aranapu River channels in western Brazilian Amazonia with Landsat TM imagery over a 21-year period. Additionally, we classified and monitored how channel migrations affect the distribution of pioneer vegetation and old-growth forest. The cloud-free study area was 153,032 ha - open water plus 3 km inland on each margin. The channel migration rates, expressed as percent dislocation of the open water body of the river year- 1, were lowest in the Japurá River (1.2%), and highest in the Aranapu channel (2.5%), the point bars at river confluence being the most affected landforms subject to geomorphic changes. Annual rates of lateral erosion and accretion of vegetated land along the three rivers were well-balanced. They averaged 0.79 and 0.83% of the cloud-free channel area over the 21 years. The Solimões River was more dynamic than the Japurá River, which can be traced to higher water discharge and sediment load. During the 21 years, the area covered by pioneer vegetation increased by 5.8% of the study area, while late-succession areas decreased by a similar amount (5.5%). According to local biomass estimates of the different vegetation types, these values suggest that C-releases by alluvial erosion would be much higher than C-sequestration caused by the creation of areas suitable for colonization by pioneer vegetation at our study site. © 2009 Elsevier Inc. All rights reserved.
metadata.dc.identifier.doi: 10.1016/j.rse.2009.06.015
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