Article
Environmental Sciences
Bo Wang, Laurence C. Smith, Xiao Yang, Tamlin M. Pavelsky, Elizabeth H. Altenau, Colin J. Gleason, Alain Pietroniro, Ernesto Rodriguez, Paul D. Bates
Summary: This study used remote sensing, cloud computing, and geospatial analysis to explore the development of anabranching in 20 of the world's largest river basins. The results show that most large river mainstems have anabranching channels, and identified important control mechanisms for anabranching, with implications for satellite-based discharge retrievals. The use of global analyses afforded by remote sensing and cloud computing offers complementary approaches to traditional field-based methods for understanding large river geomorphic processes and channel forms.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Computer Science, Information Systems
Rogerio Ribeiro Marinho, Tristan Harmel, Jean-Michel Martinez, Naziano Pantoja Filizola Junior
Summary: Monitoring suspended sediments in black-water rivers through remote sensing data, particularly in the case of the Negro River in the Amazon basin, presents challenges due to low reflectance values caused by high amounts of colored dissolved organic matter. Interannual variability in reflectance is influenced by suspended sediments input from other rivers, such as the Branco River, with the Sentinel-2 MSI Red band proving to be effective in estimating SSC with a high level of accuracy. The study highlights the suitability of sensors like the Sentinel-2 MSI for monitoring suspended sediment concentration in large tropical black-water rivers.
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
(2021)
Article
Geography, Physical
Kattia Rubi Arnez Ferrel, Jonathan Mark Nelson, Yasuyuki Shimizu, Tomoko Kyuka
Summary: Through remote sensing analysis and field works, the study examined the planform evolution and riverbed topography of the Ichilo River in the upper foreland Amazon basin. Key factors influencing meander migration rates in the river were identified as cutoffs, climate, and human interventions. The research highlights the significance of neck cutoffs and high-precipitation events in driving planform changes and channel widening in the Ichilo River.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Geosciences, Multidisciplinary
John T. Kemper, Sara L. Rathburn, Erich R. Mueller, Ellen Wohl, Julianne Scamardo
Summary: Alterations to sediment supply can cause morphological adjustment in fluvial channels, but understanding the specific changes that occur in response to sediment supply modifications has been challenging. This review focuses on the geomorphic response of low-gradient, braided and meandering alluvial river channels to increases in sediment supply. The synthesis of existing literature suggests that channel adjustment occurs at different scales, determined by thresholds defined by the characteristics of the sediment influx, and future research should aim to quantify these thresholds and investigate other controlling factors.
EARTH-SCIENCE REVIEWS
(2023)
Article
Environmental Sciences
Sergey Chalov, Kristina Prokopeva
Summary: This study provides a high-resolution assessment of sediment behavior in the Lena River, revealing significant differences in suspended sediment transport between different sections of the river. In the middle reaches of the river, sediment concentrations decrease during peak flows, while bed and lateral scour result in increased sediment load during low water seasons. The distributary system of the Lena delta experiences increased sediment transport primarily in the downstream direction, especially along major distributary channels.
Article
Environmental Studies
Vindhya Basnayaka, Jayanga T. Samarasinghe, Miyuru B. Gunathilake, Nitin Muttil, Dileepa C. Hettiarachchi, Amila Abeynayaka, Upaka Rathnayake
Summary: This study investigated the temporal changes in the river morphology of the Deduru Oya river in Sri Lanka over a period of 32 years, using Landsat satellite data and the QGIS platform. The results showed that the bend curvatures and river migration rates of the meandering bends have generally increased with time, with more meandering bends observed in the lower and middle parts of the selected river segment.
Article
Environmental Sciences
Adriano M. Junqueira, Feng Mao, Tatiana S. G. Mendes, Silvio J. C. Simoes, Jose A. P. Balestieri, David M. Hannah
Summary: This study introduces a novel approach to estimate river flows using Planet CubeSats, enabling daily monitoring at the sub-catchment scale through remote sensing. The methodology correlates water bodies areas extracted from satellite images with observed river discharge data, showing significant correlations and indicating the potential use of CubeSat images as a virtual station for flow estimation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Civil
Youssef I. Hafez
Summary: This study reveals that the imbalance between the valley slope and the regime channel slope is the main factor causing river meandering under the condition of sediment load being lower than the load transporting capacity and bank erodibility permitting. By developing novel equations, this study provides more accurate methods for calculating channel curvature and wavelength, and it also explains meandering phenomena in different types of rivers.
JOURNAL OF HYDROLOGY
(2022)
Article
Geography, Physical
Rogerio Ribeiro Marinho, Paulo Rodrigo Zanin, Naziano Pantoja Filizola Junior
Summary: This study analyzed the fluvial dynamics of the lower Negro River and the morphodynamics of the Anavilhanas Archipelago channels in the Amazon basin. The results showed that the average water velocity and depth of the channels were the most sensitive variables for water discharge variability. Furthermore, the reduction in the width/depth ratio of the channels in the Anavilhanas region is associated with an increased number of islands.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Environmental Sciences
Craig B. Brinkerhoff, Colin J. Gleason, Christopher J. Zappa, Peter A. Raymond, Merritt E. Harlan
Summary: Two decades of research have shown that the global river network emits significant amounts of greenhouse gas. This article proposes a new algorithm, BIKER, which can remotely predict the temporal variation of gas exchange in rivers solely based on observations from the SWOT satellite. The algorithm performs well in inferring the temporal dynamics of gas exchange but has limitations in reproducing the absolute rates of exchange.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
Bang Chen, Zhiwei Li, Xuyue Hu, Danyang Wang
Summary: This study analyzed the runoff and sediment load changes in the Three Outlets Channel (TOC) using remote sensing images, hydrological data, and channel topography. It found that the impoundment of the Three Gorges Reservoir and meander cutoffs influenced the diversion of runoff and sediment load, and proposed five empirical formulas for predicting future changes in the hydrologic regime and the dynamics of the Jingjiang-Dongting Lake relation.
Article
Environmental Sciences
Emmanuele Gautier, Thomas Depret, Julien Cavero, Francois Costard, Clement Virmoux, Alexander Fedorov, Pavel Konstantinov, Mael Jammet, Daniel Brunstein
Summary: This study conducted on the middle Lena River in the past 50 years analyzed the dynamics of islands and evaluated the potential impact of ongoing climate change. The results identified changes including an increase in the number of islands, greater eroded surfaces and accelerated migration of islands.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Fengzhi Cui, Jie Jiang
Summary: This paper proposes a lightweight change-detection network called Shuffle-CDNet, which achieves a good balance between computational efficiency and detection performance by introducing channel shuffle operation and depthwise separable convolution layers.
Article
Environmental Sciences
Chien-Yuan Chen, Ho Wen Chen, Chu-Ting Sun, Yen Hsun Chuang, Kieu Lan Phuong Nguyen, Yu Ting Lin
Summary: This study focused on the negative effects of river dust emissions on regional air quality and human health risks. It also evaluated the impact of different meteorological conditions on PM10 diffusion and health risks near estuary areas in central Taiwan. The results suggest that river dust emissions during both wet and dry seasons significantly increase PM10 concentrations, with certain weather conditions having considerable influence on PM10 diffusion and health risks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Romain Walcker, Dov Corenblit, Frederic Julien, Jean-Michel Martinez, Johannes Steiger
Summary: Understanding the fate of atmospheric carbon captured by plant photosynthesis is crucial for improving natural carbon flux modelling. Findings from studying the Ucayali River in Peru show that meandering rivers in forested floodplains play a significant role in promoting carbon fluxes from the atmosphere to the aquatic continuum. The migration of meandering rivers was found to contribute significantly more lignified carbon per unit area to the aquatic continuum compared to non-meandering central Amazonian floodplains.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Anderson Conceicao Mendes, Eduardo Francisco da Silva, Arthur Iven T. Fonseca, Afonso C. R. Nogueira, Thays Ferreira da Silva, Jornada do S. S. do Nascimento, Haroldo F. E. Igreja
GEOLOGICAL JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
Alek A. C. de Sousa, Edymilais S. Sousa, Marcio S. Rocha, Gustavo R. Sousa Junior, Igor V. A. F. de Souza, Ailton S. Brito, Alexandre A. Souza, Jose A. D. Lopes, Afonso C. R. Nogueira, Sidney G. de Lima
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Ailton da Silva Brito, Joelson Lima Soares, Sidney Goncalo de Lima, Afonso Cesar Rodrigues Nogueira, Guilherme Raffaeli Romero, Edymilais da Silva Sousa
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2020)
Article
Geology
Joelson Lima Soares, Afonso Cesar Rodrigues Nogueira, Renan Fernandes dos Santos, Pierre Sansjofre, Magali Ader, Werner Truckenbrodt
SEDIMENTARY GEOLOGY
(2020)
Article
Geology
Ivan Alfredo Romero Barrera, Afonso Cesar Rodrigues Nogueira, Jose Bandeira
SEDIMENTARY GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Guilherme Raffaeli Romero, Evelyn A. M. Sanchez, Joelson Lima Soares, Afonso Cesar Rodrigues Nogueira, Thomas R. Fairchild
PRECAMBRIAN RESEARCH
(2020)
Review
Geography, Physical
Afonso Cesar Rodrigues Nogueira, Kamilla Borges Amorim, Ana Maria Goes, Werner Truckenbrodt, Setembrino Petri, Anna Andressa Evangelista Nogueira, Jose Bandeira, Joelson Lima Soares, Lohan Barbosa Baia, Manoel Imbiriba Junior, Isaac Salem Bezerra, Camila C. Ribas, Joel Cracraft
Summary: Mixed carbonate-siliciclastic platforms developed along the Amazonian coast from the Palaeocene onwards, with distinct tectonic settings leading to different evolutionary histories of carbonate accumulation during the Miocene. The shutdown of Miocene carbonate accumulation has been attributed to the influx of siliciclastic fluvial sediment from the Andean Amazon River. The collapse of the carbonate platform by the Barreiras fan delta deposits during the middle Miocene was a result of intense lateritization of degraded deposits following a period of low fluvial inflow and sea-level fall.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Renan Fernandes dos Santos, Afonso Cesar Rodrigues Nogueira, Guilherme Raffaeli Romero, Joelson Lima Soares, Jose Bandeira Junior
Summary: In this study, giant domal stromatolites associated with vertical tubestone are reported for the first time in the Marinoan Puga cap dolostone in the southern Amazon Craton, Brazil. These well-preserved structures reach up to 12 meters in diameter and 10 meters in height, forming laterally continuous biostromes of at least 200 meters. The transition from stratiform to domal morphology reflects the progressive deepening of the platform, concomitant with increases in microbial activity, and provides essential insights into the interaction between biological and sedimentological conditions during the greenhouse period.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Gabriel L. Rezende, Cristiano Mendel Martins, Afonso C. R. Nogueira, Fabio Garcia Domingos, Nelson Ribeiro-Filho
Summary: The study confirmed the presence of CAMP in the sedimentary basins of Amazonia by interpreting residual gravity anomalies and combining geological data, with the geological elements being considered as high-density rocks correlated to continental tholeiitic flood basalts.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Amelia C. P. P. de Campos da Costa, Moacir J. B. Macambira, Pedro A. S. da Silva, Egberto Pereira, Afonso C. R. Nogueira
Summary: Extensive Pennsylvanian carbonate platforms are important transgressive successions on the Gondwana continents, specifically in western Gondwana. The Itaituba Formation in northern Brazil represents well-preserved carbonate platform successions with different facies associations, indicating warm climate, normal salinity, and direct connection with the ocean. The carbon and oxygen isotope data, as well as strontium ratios, suggest deposition during the Bashkirian to Kasimovian stages, with similarities to marine deposits from the Carboniferous period.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geography, Physical
Afonso Cesar Rodrigues Nogueira, Cleber Eduardo Neri Rabelo, Ana Maria Goes, Alexandre Ribeiro Cardoso, Jose Bandeira, Gabriel Leal Rezende, Renan Fernandes dos Santos, Werner Truckenbrodt
Summary: The study of the intertrap deposits in the western Parnaiba Basin in northern Brazil reveals the volcanic and sedimentary characteristics related to the CAMP, showcasing a wet desert system. These deposits, sandwiched between basalts, consist of fluvial and shallow lake sediments, highlighting the interaction between lava and sediment.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Isaac Salem A. A. Bezerra, Afonso C. R. Nogueira, Marcelo B. Motta, Andre O. Sawakuchi, Thays D. Mineli, Arnaldo de Q. Silva, Antonio G. Silva Jr, Fabio H. G. Domingos, Giovanni A. T. Mata, Felipe J. Lima, Silvio R. L. Rike
Summary: This study analyzes the fluvial deposits associated with the Amazon River in central-eastern Amazonia and improves the chronostratigraphic framework of the region through geomorphological and sedimentary facies analyses, age dating, and sediment provenance data. The results show that the Amazon River has gradually eroded the valley in central-eastern Amazonia since the Late Miocene, forming abandoned fluvial terraces and an active floodplain.
Article
Geosciences, Multidisciplinary
Edinei Koester, Ana Karina Scomazzon, Koji Kawashita, Moacir Jose Buenano Macambira, Luciane Profs Moutinho, Sara Nascimento, Valesca Brasil Lemos, Afonso Cesar Rodrigues Nogueira, Pedro Augusto Santos da Silva, Andres Felipe Rojas Mantilla
Summary: The isotopic signatures analyzed in carbonates and fossils from the Early-Middle Pennsylvanian of the Itaituba epeiric sea provide Sr and Nd data, offering insights into the paleoseawater and paleotectonic conditions of the Amazonas Basin. The Sr-87/Sr-86 data range and epsilon Nd values indicate marine sedimentation and post-depositional alterations, while the Nd isotopic signature suggests a diverse origin of seawater sources during this time period. The Nd-143/Nd-144 isotopic values support an old continental Nd provenance for the ancient seawater in the Amazonian Craton.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geography, Physical
Gabriel Ribeiro Moizinho, Lucieth Cruz Vieira, Roberto Ventura Santos, Afonso Cesar Rodrigues Nogueira, Elton Luiz Dantas, Martin Roddaz
Summary: The deposition of siliciclastic sediments along the Eastern Amazonia coast during the middle Miocene was not related to the transcontinental Amazon River or Andean influence. Instead, the primary sources were reworked sedimentary rocks from the Eastern Marajó Basin and Bragantina Platform, indicating different depositional histories controlled by sea level fall and tectonic reactivations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Pedro Augusto Santos da Silva, Afonso Cesar Rodrigues Nogueira, Joelson Lima Soares, Jose Bandeira, Ana Karina Scomazzon, Sara Nascimento, Luciane Profs Moutinho, Sanmya Karoline Dias
Summary: This passage discusses the geological features and facies analysis results of the shallow seas in the central Amazonas Basin during the late Carboniferous, including three main facies associations: coastal aeolian deposits, mixed tidal flat setting, and carbonate epicontinental platform deposits.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
David Dominguez-Santos, Daniel Valderrama, Ahmet Utku Yazgan
Summary: This document presents a study comparing the spectra of large-magnitude seismic records in Chile between 2012 and 2022 with the design spectra of NCh433 and D. S 61. The aim is to determine if Chile's seismic-resistant regulations are updated to the existing reality and propose new design spectra that better represent the seismic activity in Chile during the last decade.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Prabhu Palanisamy, Vivek Sivakumar, Priya Velusamy, Logesh Natarajan
Summary: Shoreline changes in the southern coast of Rio de Janeiro, Brazil, were analyzed from 1986 to 2018. The study found that both natural and human factors significantly impact shoreline changes. The findings provided important insights into predicting future shoreline positions and identifying vulnerable regions. Additionally, human activities were found to influence shoreline change models, emphasizing the need for effective management strategies to protect ecosystems and communities.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Irina Salgado Bernal, Periyasamy Sivalingam, Armando Martinez Sardina, Michel Manduca Artiles, Maria E. Carballo Valdes, John Pote
Summary: This study investigated the presence of 15 toxic metals in surface sediment in a tropical river ecosystem in Cuba. The results showed that the sediments had higher concentrations of four metals compared to Cuban norms. Various contamination indices were calculated, and correlations analysis revealed the main sources of contamination. The study provides important information for the management of the river and emphasizes the need for metal pollution control and monitoring.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Camila Morgan, Eduardo Morgado, Miguel-Angel Parada, Raimundo Brahm, Francisca Mallea-Lillo
Summary: Lanin volcano is a composite volcano in the Andes, which has erupted lava flows with different compositions. The volcano's magma reservoir contains a crystal mush, and the pre-eruptive conditions include temperature, pressure, and oxygen fugacity. Fractional crystallisation has led to the evolution of the magma with different compositions.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Benjamin Idini, Sergio Ruiz, Jean-Paul Ampuero, Felipe Leyton, Efrain Rivera
Summary: This study investigates the role of wedge integrity on the frequency content of strong ground motion produced by subduction earthquakes in Northern Chile. The results show that the frequency characteristics of seismic waves vary with hypocentral distance, indicating lateral variations in anelastic attenuation due to the heterogeneous tectonic structure.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)