Remote sensing-based analysis of the planform changes in the Upper Amazon River over the period 1986–2006

Rozo, Max G.; Nogueira, Afonso César Rodrigues; Castro, Carlomagno Soto

doi:10.1016/j.jsames.2013.12.004

Cited by 47 publications

(41 citation statements)

References 24 publications

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“…Na região Andina, os valores de taxa de migração obtidos são mais elevados e variados, conforme demonstrado nos estudos de Rozo e Soto (2009, 2010 e Rozo et al (2014), que encontraram valores de 0,24%/ano (1999)(2000)(2001)(2002)(2003)(2004), 0,48%/ano (1986-2004), 0,55%/ano (1986-1999), 1,4% (1978-2006), de 1,9% (1986-1994) e 2,0%/ano (1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001) na região entre Caballo Cocha (Peru) e Benjamim Constant (Brasil). Entretanto, o valor de 37%/ano (1979)(1980)(1981)(1982)(1983) foi definido por Kalliola et al (1992) Mertes et al (1996Mertes et al ( ) 1979Mertes et al ( -1980Mertes et al ( 1971Mertes et al ( -1972 As modificações morfológicas definidas no sistema Solimões-Amazonas, no trecho entre os tributários Purus e Negro, demonstraram uma taxa de migração em torno de 0,32%/ano (1991-2011), com variações de 4,26%/ano (1991-2009) entre Codajás e Anori, 1,73%/ano (1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) entre Anori e Manacapuru, e 4,23%/ano (1995)…”

Section: Resultados E Discussõesunclassified

“…Na análise das áreas 1 e 2 foram utilizadas as imagens de 1991 e 2009, e da área 3 as imagens de 1995 e 2011, com variações de cotas de 81 cm e 56 cm, respectivamente. Nas análises multitemporais obtidas para o sistema Solimões-Amazonas em diversos estudos, estes valores de cotas estão próximos aos realizados em diferentes trechos, podendo ser comparados ao valor de 52 cm obtido na fronteira tríplice Brasil-Peru-Colômbia (Rozo e Soto, 2010;Rozo et al, 2014), ao valor de 82 cm no trecho entre os tributários Negro e Madeira (Rozo, 2004) e ao intervalo de 100 a 290 cm na confluência com o rio Japurá (Peixoto et al, 2009). As variações de cota têm sido relacionadas principalmente às datas de aquisição das imagens, que dependem da resolução temporal do sensor Landsat (intervalos de 16 dias) e cobertura de nuvens que, consequentemente, influenciam na quantificação das áreas de erosão e deposição.…”

Section: Materiais E Métodosunclassified

“…Um dos trabalhos pioneiros foi o de Mertes et al (1996), que analisaram este sistema desde Iquítos (Peru) até a foz do rio Amazonas, destacando as modificações e mobilidade dos canais em diversos trechos. Estudos recentes definiram valores de taxas de erosão, deposição e migração dos canais do sistema Solimões-Amazonas entre os tributários Negro e Madeira (Rozo, 2004;Rozo et al, 2005Rozo et al, , 2012, na confluência do rio Japurá com o rio Solimões (Peixoto et al, 2009) e no trecho do rio Solimões na fronteira tríplice Brasil-Peru-Colômbia (Rozo e Soto, 2009, 2010Rozo et al, 2014).…”

Section: Introductionunclassified

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Análise multitemporal do sistema fluvial Solimões-Amazonas entre os tributários Purus e Negro, Amazônia Ocidental, Brasil

Passos

Soares

2017

Geol. USP. Sér. Cient.

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Nas últimas décadas, as feições geomorfológicas de trechos do sistema fluvial Solimões-Amazonas têm sido estudadas por meio de imagens de sensores remotos, aliados a dados de análise multitemporal, destacando principalmente as modificações morfológicas das planícies aluviais e canais deste sistema. Os primeiros estudos utilizavam bases cartográficas de menor precisão em comparação às atuais e não consideravam alguns fatores como a cota dos rios, tipos de sensores e imprecisões na aquisição dos dados, o que diminui a acurácia dos dados. Atualmente, dentre os fatores mais enfatizados na análise desse sistema fluvial, destacam-se a taxa de migração dos canais e a definição do estilo fluvial em diferentes trechos, que variam entre os tipos mais conhecidos na literatura. Este trabalho demonstra por meio da análise multitemporal de imagens Landsat-5/TM a fase final de evolução do sistema fluvial Solimões-Amazonas, no trecho entre os tributários Purus e Negro, no decorrer dos anos de 1991 e 2011. As interpretações indicam leve predominância dos processos deposicionais em relação aos erosivos no trecho analisado, com áreas de 8,56 km2 e 6,86 km2, respectivamente, obtendo-se assim uma taxa de migração média de 0,32%/ano. Os processos deposicionais se concentram principalmente na parte convexa dos meandros e nas áreas a jusante das ilhas, incluindo a formação de novas ilhas, e os erosivos na parte côncava dos meandros e a montante das ilhas. Apesar da dinâmica de erosão e deposição observada no trecho estudado deste sistema, foi possível constatar o elevado padrão de estabilidade dos canais, o qual é coerente com dados batimétricos e de taxa de migração de estudos geológicos regionais, que ajudam a caracterizar o atual estilo fluvial anabranching.

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Section: Resultados E Discussõesunclassified

Section: Materiais E Métodosunclassified

Section: Introductionunclassified

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Análise multitemporal do sistema fluvial Solimões-Amazonas entre os tributários Purus e Negro, Amazônia Ocidental, Brasil

Passos

Soares

2017

Geol. USP. Sér. Cient.

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“…Morphometric parameters, such as channel width [5,6], water surface area [7] and sinuosity [8], were calculated in several studies to evaluate the migration of channel planform morphology. Bank erosion and deposition [9,10], channel pattern identification [11,12], bank line and centerline shift [13] and channel change caused by human intervention [14,15] have been investigated on the basis of remotely sensed data.…”

Section: Introductionmentioning

confidence: 99%

“…However, the extracted water boundary was sensitive to the concurrent water level variations, and the channel changes derived from satellite images with the concurrent water level in different value ranges could vary. A low water level could cause considerable exposure of the river bed that would lead to errors in the extracted channel compared with that in a high water level [11]. Only satellite images with the least possible water level differences could be selected to decrease the errors.…”

Section: Introductionmentioning

confidence: 99%

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

et al. 2015

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Abstract:In China, the Lower Jingjiang Reach (LJR) of the Yangtze River could be one of the most complicated areas in terms of channel migration. The river had undergone many channel changes in the reach since the 18th century. Intensive human activities in recent decades, such as the construction of upstream dams and revetments, had directly affected the channel migration characteristics. The revetment would significantly diminish migration, whereas the reduced sediment caused by dams would increase bank erosion and bank failure risks. Satellite imageries of Landsat Multi Spectral Scanner (MSS), Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+) and Operational Land Imager (OLI) were employed to quantify the planform migration of the reach from 1983 to 2013 and to investigate the possible effect of human activities on the LJR channel evolution. Apart from the commonly used planform morphometric parameters, the migration direction was introduced to predict the future migration trends. Results showed that the LJR was gradually changing to a straighter channel, with sinuosity reducing from 2.09 to 1.9 and river length decreasing from 125.32 km to 113.31 km in the past 30 years. Planform morphometric parameters, such as migration rate of the channel centerline and erosion and deposition areas and rates, also decreased drastically in the past 30 years. The migration rate of the channel centerline decreased from 31.05 m¨year´1 in 1983-1988 to 11.62 m¨year´1 in 2009-2013. The lateral erosion and deposition areas decreased from 21.32 and 25.73 km 2 in 1983-1988 to 4.83 and 5.83 km 2 in 2009-2013. All of these findings indicate that the LJR tended to be in a steady state from 1983 to 2013 and was totally controlled by the bank revetments. However, the undercutting was strengthened because of the restrictive effect of revetments on lateral migration in the LJR. Moreover, the channel migrated to the left bank with a visible tendency as the total migration area to the left bank was approximately two times that of the right bank during the period. Consequently, the left bank of the LJR should be the focus of more attention in future migrations, and bank revetments of the left bank should be kept reinforced and adjusted with the change of water and sediment conditions.

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Planform evolution of two anabranching structures in the Upper Peruvian Amazon River

Frias

Abad

Mendoza

et al. 2015

Water Resources Research

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We present a study to relate the sinuosity of the main channel and its effect on the dynamics of the secondary channels of anabranching structures. For this purpose, two locations of the Peruvian Amazon River were selected: (1) a site with a medium to high-sinuosity main channel (MS site: Muyuy, Peru) and (2) a site with a low-sinuosity main channel (LS site: at the triple boundary between Brazil, Colombia, and Peru). The main channels for both the MS and LS anabranching structures have freedom to migrate in the lateral direction, while at least one of their secondary channels is adjacent to the geological valley. For MS and LS sites, temporal analysis of planform evolution was carried out using 30 years of satellite imagery from which metrics such as width, sinuosity, and annual maximum migration rates of main and secondary channels were calculated. Additionally, detailed hydrodynamic and bed morphology field measurements were carried out, and a two-dimensional shallow water numerical model was developed. For a medium to high-sinuosity main channel anabranching structure, the secondary channels present a dominant mechanism for reworking the floodplain, while for the low-sinuosity anabranching structure, the main channel planform dynamics is dominant. Flow velocities along the main and secondary channels for low, transition, and high-flow discharges describe that for MS (LS) site, the velocities are much higher along the secondary (main) channels.

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Remote sensing-based analysis of the planform changes in the Upper Amazon River over the period 1986–2006

Cited by 47 publications

References 24 publications

Análise multitemporal do sistema fluvial Solimões-Amazonas entre os tributários Purus e Negro, Amazônia Ocidental, Brasil

Análise multitemporal do sistema fluvial Solimões-Amazonas entre os tributários Purus e Negro, Amazônia Ocidental, Brasil

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

Planform evolution of two anabranching structures in the Upper Peruvian Amazon River

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