Naziano Filizola Jr

• PhD
• Professor at Federal University of Amazonas

Este estudo avaliou o uso de imagens do PlanetScope na confluência dos rios Beni e Mamoré, com o objetivo de analisar, de forma temporal e espacial, o transporte de material em suspensão na superfície. Os dados coletados em campo em 2021 abrangem a região a montante da Usina Hidrelétrica de Jirau, no rio Madeira, estendendo-se até a confluência des...

Este estudo analisou o comportamento espectral do Rio Amazonas, no trecho entre as cidades de Juruti e Óbidos, e nos lagos Curuai e Paru utilizando técnicas de sensoriamento remoto in situ. Foi coletado um conjunto de dados da reflectância de sensoriamento remoto (Rrs) da água em conjunto com a determinação da concentração do material em suspensão...

The Amazon River is the longest river in the world flowing from the Peruvian Andes to the large Amazonian floodplain. The elevation gradient has a huge role in “pushing” waters from source to sink. It transports a huge amount of water (6.62 × 1012 L/year) to the ocean, and the eroded material from the basin (>1.0 × 109 t/year as particles and >270...

In 2023, an unprecedented drought and heatwave severely impacted Amazon waters, leading to high mortality of fishes and river dolphins. Five of 10 lakes monitored showed exceptionally high daytime temperatures (>37°C), with one large lake reaching up to 41°C in the entire ~2-m deep water column, with up to 13°C of diel variation. Modeling show that...

Amazon River - Critical Zone Observatory - Hydrology - Sedimentology - Geochemistry - Climate Change - Model - Open Data

É com grande satisfação que apresentamos o mais recente número da Revista Geonorte, Volume 16, Número 48, uma edição especial que lança luz sobre a fascinante e complexa dinâmica da bacia do Rio Negro, intitulada "Rio Negro - Tempo, Água e Rocha". Esta edição tem como objetivo principal divulgar resultados inéditos de pesquisas desenvolvidas na reg...

Background Malaria is transmitted by different Anopheles species. In Brazil, the disease is concentrated in the Amazon region. Rivers play an important role in the life cycle of malaria since the vector reproduces in aquatic environments. The waters of the rivers in the Amazon have distinct chemical characteristics, which affect the colour of the w...

http://www.jornaldaciencia.org.br/seca-extrema-nos-rios-e-incendios-na-amazonia-um-chamado-a-acao/

The study aims to know the evolution of the malaria incidence in the municipalities of the state of Amazonas, during the period from 2003 to 2019, as well as to analyze the existence of seasonality of the disease. Using Pettitt's statistical test, changes in the pattern of malaria distribution were found, especially after 2011. On average, high val...

Background Malaria is an infection caused by parasites of the genus Plasmodium, which are transmitted to humans via the bite of the female Anopheles mosquito. In Brazil, approximately 99% of malaria cases are concentrated in the Amazon region. Os rios desempenham um papel importante no ciclo de vida da malária, uma vez que o vetor se reproduz em am...

The special issue “South American rivers and wetlands: Evolution, dynamics, and threats” presents 16 studies covering most South America watersheds and the large wetland (Pantanal). These studies frameworks include the water and sediments supply current and past analysis from several drainage basins, added to climate behavior analysis news methodol...

The study of the morphology and hydrodynamics of large rivers has advanced in recent decades. Nonetheless, there are a few studies with surveyed data carried out at the confluences of the mega rivers (Q > 17,000 m³s−1), especially those from the Amazon basin. The Negro River is the main river in the northwestern Amazon and is considered the sixth-l...

In Brazil, approximately 99% of malaria cases are concentrated in the Amazon region. An acute febrile infectious disease, malaria is closely related to climatic and hydrological factors. Environmental variables such as rainfall, flow, level, and color of rivers, the latter associated with the suspended sediment concentration, are important factors...

Hydrodynamic features of the confluence zone of large rivers are complicated because of their three-dimensional flow structure. The confluence between the Rio Negro and the Rio Solimões, characterised by black and white waters, respectively, ranks among the largest river junctions on Earth. An Entropy-based investigation was carried out to assess t...

The dynamics of suspended sediment production and transport in large rivers are essential geomorphological processes that can influence biodiversity. The aim of this work was to analyze the spatio-temporal variation of suspended sediment transport in the lower Negro River using Sentinel-2 images. The suspended sediment concentration (SSC) was estim...

L'observatoire HyBAm sur les grands cours d'eau amazoniens permet, par son approche pluridisciplinaire et de long terme, par sa structure en partenariat, par le libre accès aux données et une promotion active de la recherche et de la formation, de renseigner et comprendre les changements globaux et locaux (changements massifs d'occupation des sols,...

The evolution of the fluvial landscape is the result of controls and processes that can be observed by the adjustments a river makes to its hydrological regime. The Negro River is the sixth-largest river in the world by water volume and contains two complex anabranching systems, the Anavilhanas and Mariuá Archipelagos, and despite its importance, t...

The Madeira River rises in the Andes, draining the southwestern Amazon basin and contributing up to 50% of the Amazon River sediment load. The Porto Velho station monitors the Upper Madeira basin and is located just downstream of the Jirau and Santo Antonio hydropower dams. At this station, decreasing trend (p<0.10) of the surface suspended sedimen...

On the Amazon river, northwest of the basin of the Amazon river, the stream gauging station of Tamshiyacu (Peru) reports that the level goes down by 7 meters between the flood in April-May and the low water levels in September. This decline allows the cultivation of large fertile dewatered areas on the riverbanks and floodplains (varzea). Subsisten...

When two mega rivers merge the mixing of two flows results in a highly complex three- dimensional flow structure in an area known as the confluence hydrodynamic zone. In the confluence zone, substantial changes occur to the hydrodynamic and morphodynamic features which are of significant interest for researchers. The confluence of the Negro and Soli...

This study describes the impacts of refinement of hydraulic geometry (HG) relationships in the hydrological MGB model applied to an Amazonian sub-basin (Purus River basin). To this end, HG relationships were developed for the entire basin and for hydrologically homogeneous regions, and their performances were compared with observed data and a globa...

Rios amazônicos desempenham função estratégia no desenvolvimento da região. Estuda-los permite orientar na tomada de decisão em relação ao gerenciamento dos usos conflitosos dos recursos de uma bacia hidrográfica. No entanto, ainda é grande a falta de dados hidrológicos sobre eles, sobretudo em pequenas bacias. Um rio pode ter seus atributos altera...

The Tropical Atlantic is facing a massive proliferation of Sargassum since 2011, with severe environmental and socioeconomic impacts. As a contribution to this proliferation, an increase in nutrient inputs from the tropical rivers, in response to climate and land use changes or increasing urbanization, has been often suggested and widely reported i...

Monitoring suspended sediments through remote sensing data in black-water rivers is a challenge. Herein, remote sensing reflectance (Rrs) from in situ measurements and Sentinel-2 Multi-Spectral Instrument (MSI) images were used to estimate the suspended sediment concentration (SSC) in the largest black-water river of the Amazon basin. The Negro Riv...

En 'Amazonie des rivières ', au nord-ouest du bassin, le fleuve Amazonas descend de 7 m entre la crue en avril-mai et l'étiage en septembre, à la station fluviométrique de Tamshiyacu (Pérou). La décrue permet la mise en culture de vastes zones exondées et fertiles sur les berges de la rivière et dans les plaines d'inondation (varzea). Les cultures...

Historically, streamflow daily values are obtained indirectly by applying a rating curve on water level data. In several Amazon basin stations, a backwater effect impacts the flow, thereby invalidating the rating curve method. To account for this effect, we generated a daily discharge data series by applying the Manning equation to daily water leve...

No momento em que os estudos para a implantação da UHE Bem Querer avançam rapidamente [3], torna-se importante chamar atenção para resultados de pesquisas recentes que levantam preocupações sobre os impactos potenciais desta barragem. Ao menos sete barragens estão planejadas para a bacia do rio Negro, sendo quatro ao longo do rio Branco. A UHE de B...

Este estudo caracterizou os sistemas lacustres do Arquipélago de Anavilhanas e avaliou a variação espacial da superfície de água em condições próximas as médias fluviométricas interanuais para cada período, utilizando imagens do Landsat 08 e dados fluviométricos do Rio Negro. A variação sazonal observada para todo o arquipélago foi na ordem de 10%....

Confluences are common components of all riverine systems, characterized by converging flow streamlines and the mixing of separate flows. The fluid dynamics of confluences possesses a highly complex structure with several common types of flow features observed. A field study was recently conducted in the area of the confluence of the Negro and Soli...

The biodiversity and productivity of the Amazon floodplain depend on nutrients and organic matter transported with suspended sediments. Nevertheless, there are still fundamental unknowns about how hydrological and rainfall variability influence sediment flux in the Amazon River. To address this gap, we analyzed 3069 sediment samples collected every...

This article analyzes the flows of water and total suspended sediment in different reaches in the lower course of the Negro River, the largest fluvial blackwater system in the world. The area under study is the Anavilhanas Archipelago, which is a complex multichannel reach on the Negro River. Between the years 2016 and 2019, data about water discha...

Introdução: A malária é uma doença infecciosa de alta transmissão na região amazônica, porém sua dinâmica e distribuição espacial podem variar, dependendo da interação de fatores ambientais, socioculturais, econômicos e políticos e serviços de saúde. Objetivo: Verificar a existência de padrões de casos de malária em consonância com os regimes fluv...

The occurrence of hydrological extremes in the Amazon region and the associated sediment loss during rainfall events are key features in the global climate system. Climate extremes alter the sediment and carbon balance but the ecological consequences of such changes are poorly understood in this region. With the aim of examining the interactions be...

Confluences are integral features in rivers characterized by complex 3D changes in flow hydrodynamics and bed morphology and provide important ecological functions. This paper presents the first known analysis of 3D spatial habitat metrics, based on hydraulic complexity, using data from the Negro and Solimões rivers confluence in the Amazon Basin,...

Fluvial sediment dynamics plays a key role in the Amazonian environment, with most of the sediments originating in the Andes. The Madeira River, the second largest tributary of the Amazon River, contributes up to 50% of its sediment discharge to the Atlantic Ocean, most of it provided by the Andean part of the Madeira basin, in particular the Beni...

Confluences are common components of all riverine systems, and characterized by converging streamlines and potential mixing of separate flows. The fluid dynamics of confluences possess a highly complex structure with several common types of flow features observed. An investigation was carried out in both low and relatively high flow conditions at t...

Confluences are common components of all riverine systems, and characterized by converging streamlines and potential mixing of separate flows. The fluid dynamics of confluences possess a highly complex structure with several common types of flow features observed. An investigation was carried out in both low and relatively high flow conditions at t...

Informações sobre a qualidade e quantidade dos recursos hídricos são essenciais para a gestão ambiental e melhor tomada de decisão. Neste trabalho apresentamos o conjunto de dados adquiridos pelo projeto de pesquisa HIDROGEOS-NEGRO, que tem como foco investigar a variação espacial e temporal dos fluxos de água e matéria transportada nos canais do a...

The Madeira River is the second largest Amazon tributary, contributing up to 50% of the Amazon River’s sediment load. The Madeira has significant hydropower potential, which has started to be used by the Madeira Hydroelectric Complex (MHC), with two large dams along the middle stretch of the river. In this study, fine suspended sediment concentrati...

O entendimento das relações entre as variáveis de precipitação e nível d’água dos rios com os casos de malária podem fornecer indícios importantes da modulação da doença no contexto da variabilidade climática local. No intuito de demonstrar como essas relações variam no mesmo espaço endêmico, realizou-se a análise de coerência e fase de ondeletas e...

Confluences within riverine systems have important ecological and morphological functions, and ecent research is exploring how hydrodynamics might explain ecological richness about confluences. Confluences can have a highly complex three-dimensional flow structure with several common types of flow features relating to the bed morphology within the...

Core Ideas OZCAR is a network of sites studying the critical zone. OZCAR covers various disciplines. OZCAR will help disciplines to work together for a better representation and modeling of the critical zone. The French critical zone initiative, called OZCAR (Observatoires de la Zone Critique–Application et Recherche or Critical Zone Observatories...

This study focuses on the confluence of two major rivers of the world, the Solimões River (white waters) and Negro River (black waters). Surface suspended sediment samples (SSC) and spectroradiometer taken along transverse profiles at 500 m intervals over a distance of 10 km, as well as satellite images (MODIS) during the hydrological year, were us...

The behaviour and fate of copper (Cu) and zinc (Zn) at river confluences is poorly understood, although chemical and physical processes during mixing of compositionally different tributaries might condition metal availability and fluxes to the ocean. To identify and quantify the effect of such processes in river mixing zones, particulate Cu and Zn...

Confluences are a common feature of riverine systems, where are located converging flow streamlines and potential mixing of separate flows. The confluence of the Negro and Solimões Rivers ranks among the largest on Earth and its study may provide some general insights into large confluence dynamics and processes. An investigation was recently condu...

The confluence of the Negro and Solimões Rivers is an interesting study area under several points of view: it represents the second largest river confluence of the Amazon Basin; the rivers are characterised by very distinct hydrologic behaviour; and it is situated in a peculiar tectonic setting. A field investigation was undertaken to study the cha...

Nas grandes bacias hidrográficas tropicais, os efeitos conjugados da variabilidade climática e das modificaçoes da cobertura do solo são detalhadamente estudados através de várias redes de pesquisa, como o HYBAM (Guyot et al., 2005, Laraque et al., 2005, Filizola, 2003 e Filizola & Guyot, 2004). Porém, as margens dos rios e sua zona hiporreica dest...

Confluences are a classic feature in riverine networks with important ecological and morphological functions. A method to characterize the hydraulic complexity of a river based on velocity gradients was applied, for high and low flow conditions, to the Negro and Solimões Rivers confluence in the Amazon Basin. The applied metrics M1 and M2 approxima...

The Madeira River is the second largest tributary of the Amazon River. It contributes approximately 13% of the Amazon River flow and it may contribute up to 50% of its sediment discharge to the Atlantic Ocean. Until now, the suspended sediment load of the Madeira River was not well known and was estimated in a broad range from 240 to 715 Mt yr⁻¹. S...

In the last four decades a wide body of theoretical, experimental, and field research has emerged concerning the fluvial dynamics of river confluences. This abstract discusses and compares the results from three large field studies carried out in 1997, 2006/2007 and 2014/2015 at of the Negro/Solimões confluence in the Amazon Basin that ranks among...

Large hydrological systems aggregate compositionally different waters derived from a variety of pathways. In the case of continental-scale rivers, such aggregation occurs noticeably at confluences between tributaries. Here we explore how such aggregation can affect solute concentration-discharge (C-Q) relationships and thus obscure the message carr...

O uso da altimetria radar é uma forma de monitorar o nível de grandes rios e lagos da bacia Amazônica através de satélites que tem sido utilizada os últimos dez anos com grande eficiência. Embora estações fluviométricas convencionais possuam grande série histórica de dados, diversas áreas da planície amazônica ainda permanecem sem informações sobre...

Confluences are very complex fluvial networks where the combination of matter (water and sediment) and energy (flow strength) from two different channels take place. The confluence of Rio Negro, with is black waters, and the Rio Solimões, with its suspended white sediments, is one of the biggest confluences on the earth and attracts thousands of to...

The Purus River is one of the major tributaries of Solimões River in Brazil, draining an area of 370,091 km² and stretching over 2765 km. Unlike those of the other main tributaries of the Amazon River, the Purus River's sediment discharge is poorly characterized. In this study, as an alternative to the logistic difficulties and considering high mon...

Despite growing interest in urban vulnerability to climatic change, there is no systematic understanding of why some urban centers have greater social vulnerability than others. In this article, we ask whether the social vulnerability of Amazonian cities to floods and droughts is linked to differences in their spatial accessibility. To assess the a...

More than a hundred hydropower dams have already been built in the Amazon basin and numerous proposals for further dam constructions are under consideration. The accumulated negative environmental effects of existing dams and proposed dams, if constructed, will trigger massive hydrophysical and biotic disturbances that will affect the Amazon basin’...

The Amazon River sediment discharge has been estimated at between 600 and 1200 Mt/year, of which more than 50% comes from the Solimões River. Because of the area's inaccessibility, few studies have examined the sediment discharge spatial and temporal pattern in the upper Solimões region. In this study, we use MODIS satellite images to retrieve and...

Use of satellite altimeter data is an efficient way for monitoring water levels in large rivers and lakes. Although traditional gauges have large historic series, various floodplain areas in the Amazon Basin remain unseen for water level data. This paper evaluates the use of altimetry data from missions ENVISAT and JASON-2 in two rivers of Brazilia...

Restoring biogeographical richness in rivers requires establishing biophysical explanations for why species richness increases at river confluences, in a nodal pattern. This research addresses the question, does hydraulic complexity in the Amazon’s confluence of the Negro and Solimões Rivers provide a biophysical explanation of richness?

The Epidemiological Surveillance System for Malaria (SIVEP-Malaria) is the Brazilian governmental program that registers all information about compulsory reporting of detected cases of malaria by all medical units and medical practitioners. The objective of this study is to point out the main sources of errors in the SIVEP-Malaria database by apply...

Accurately measuring sediment flux in large rivers remains a challenge due to the spatial and temporal cross-sectional variability of suspended sediment concentrations in conjunction with sampling procedures that fail to accurately quantify these differences. This study presents a field campaign methodology that can be used to improve the measureme...

En "Amazonie des rivières", la période de basses eaux permet la mise en culture de vastes zones exondées et fertiles sur les berges des rivières et dans les plaines d'inondation. La variabilité des extrêmes hydrologiques et celle de la structure du cycle de décrue, facteurs réputés importants pour la qualité des récoltes sont explorés à la station...

Land production potential (LPP) was the maximum grain yield in one year that can be produced by land under the limitations of climate conditions and in the absence of pests and diseases and other factors. Whether climate change was increasing or reducing the LPP in a given region was uncertain. Therefore, Shaanxi Province was selected to analyze th...

Le Service National d’Observation HYBAM sur les grands fleuves du bassin Atlantique : un dispositif de recherche en coopération Sud-Sud-Nord

Dinámica del transporte solido grueso el la cuenca amazónica: primeros resultados

Sensibilidade dos fluxos de sedimentos na Amazônia frente a variabilidade climática

Silicate weathering budgets of continental basins and identification of the main factors that control them are major issues in geochemistry. In particular, the influence of geomorphological setting on the global weathering budget remains unclear. Dissolved silica (Si) concentration in a river can be used as an index of silicate weathering regime. G...

We present an extensive investigation of a new erosion and weathering proxy derived from the 10Be(meteoric)/9Be(stable) ratio in the Amazon River basin. This new proxy combines a radioactive atmospheric flux tracer, meteoric cosmogenic 10Be, with 9Be, a trace metal released by weathering. Results show that meteoric 10Be concentrations ([10Be]) and...

Presented herein are details of the key morphodynamic and hydrodynamic features observed during a field campaign conducted about the confluence of the Negro and Solimões Rivers, Brazil as well as some insights on the interaction of these flow and bed features. Since this confluence ranks among the largest on Earth this study aims to provide some ge...

Quantification of river dissolved and particulate fluxes is essential for understanding the role of weathering and erosion in geochemical cycles. The Amazon River is a natural laboratory where novel methods to quantify riverine fluxes can be verified, because of the density of published data on present-day sediment and dissolved loads (e.g. [1-3])...

During the low-water season, agriculture products and fish are abundant and inexpensive while wild meat is not available. Perspective: How does hydrological interannual variability in western Amazon impacts food security ? How people deal with it ? How will it impact food security under climate change ?

The Amazon Dense Global Navigational Satellite System (GNSS) Meteorological Network ((ADGMN) provides high spatiotemporal resolution, all-weather precipitable water vapor for studying the evolution of continental tropical and sea-breeze convective regimes of Amazonia. The ADGMN campaign consisted of two experiments: a 6-week campaign in and around...