Sly Wongchuig

Verified

Sly verified their affiliation via an institutional email.

Learn more

Verified

Sly verified their affiliation via an institutional email.

Learn more

• PhD in Water Resources and Environmental Sanitation
• PostDoc Position at Laboratory of Space Geophysical and Oceanographic Studies

This technical note presents a comparative analysis between the heavy rainfall that occurred in Rio Grande do Sul, between April and May 2024, with the heaviest rainfall events ever observed in Brazil, between 1961 and 2022. The comparative analysis was performed using the Depth Area Duration technique, suitable for the analysis of heavy rainfall o...

Esta nota técnica apresenta uma análise comparativa entre as chuvas intensas ocorridas no Rio Grande do Sul, entre abril e maio de 2024, com os maiores eventos de chuva já observados no Brasil, entre 1961 e 2022. A análise comparativa foi realizada utilizando a técnica Depth Area Duration, que é adequada para a análise de chuvas intensas em grande...

In late 2023, the Amazon River Basin experienced its most extreme drought, putting its population and ecosystem at major risks. Gauges that were still functioning measured the lowest river water levels (RWL) on record. Here, satellite observations, including Surface Water Ocean Topography (SWOT), reveal the spread and timing of extremely low RWL ac...

Satellite remote sensing enhances model predictions by providing insights into terrestrial and hydrological processes. While data assimilation techniques have proven promising, there is a lack of standardized and effective approaches for integrating multiple observations simultaneously. This study presents a novel assimilation framework, the multi‐...

Presented at session 6: Organization of convection: from process understanding to high-impact weather and lightning warning. This work explores the impacts of Amazonian deforestation on the shallow and deep convection during the dry-to-wet transition season in the southern Amazon using the regional climate model RegIPSL.

The Amazon River Basin’s extraordinary social–ecological system is sustained by various water phases, fluxes, and stores that are interconnected across the tropical Andes mountains, Amazon lowlands, and Atlantic Ocean. This “Andes–Amazon–Atlantic” (AAA) pathway is a complex hydroclimatic system linked by the regional water cycle through atmospheric...

Accessibility to reliable historical hydro-climatological data with adequate spatial and temporal scales is challenging for water security analysis, especially in data-scarce regions such as the Amazon. Solutions to obtain these kinds of data can be outlined through climate and hydrological reanalysis studies, even with limited inventories. The pre...

O livro Hidrologia da Amazônia vista do espaço: avanços científicos e desafios futuroso é uma tradução do artigo de revisão não sistemática publicado em 2021 na Review of Geophysics (https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020RG000728). O livro apresenta uma extensa revisão das conquistas de mais de três décadas de avanços científicos...

Study region: The Congo River basin (CRB), the world's second-largest river system, is subject to extreme hydrological events that strongly impact its ecosystems and population. Study focus: Here we present an improved 40-year (1981-2020) hydrological reanalysis of daily CRB discharge and analyze the spatiotemporal dynamics of recent major CRB floo...

Resumen El proyecto "Origen, frecuencia y magnitud de los repiquetes, su impacto en la agricultura amazónica y en el transporte de sedimentos, utilizando sensoramiento remoto", financiado por PROCIENCIA, tuvo como objetivo estudiar las características climatológicas e hidrológicas que producen inundaciones repentinas (conocidos como repiquetes) en...

The Amazon forest has a complex interaction with climate at different spatial and temporal scales. This means that alterations in land use could modify the regional water cycle, including the surface and atmospheric water budget. However, little is known about how these changes occur seasonally and in a spatially distributed manner in the most vuln...

The spatio-temporal variation of surface water storage (SWS) in the Congo River basin (CRB), the second-largest watershed in the world, remains widely unknown. In this study, satellite-derived observations are combined to estimate SWS dynamics at the CRB and sub-basin scales over 1992–2015. Two methods are employed. The first one combines surface w...

Study region The western Amazon basin at Tamshiyacu gauging station (near the Iquitos City) hosts floodplain agriculture that can be affected by the sudden reversal in direction of water levels known as “repiquetes” that produce intermittent flooding. Study focus This study assesses repiquete flooding risk in riparian crop areas based on statistic...

Continued Amazonian deforestation perturbs the surface turbulent fluxes which are important for building the conditions for the wet season onset in the southern Amazon. This work evaluates the impacts of tropical deforestation on the onset and development of the Amazonian rainy season using a weather typing approach. We use 19-year simulations (200...

The lake level dynamics of the Qinghai–Tibetan Plateau (QTP, also called the ‘Third Pole’) are a crucial indicator of climate change and human activities; however, they remain poorly measured due to extremely high elevation and cold climate. The existing satellite altimeters also suffer from relatively coarse temporal resolution or low spatial cove...

Extensive floodplains throughout the Amazon basin support important ecosystem services and influence global water and carbon cycles. A recent change in the hydroclimatic regime of the region, with increased rainfall in the northern portions of the basin, has produced record-breaking high water levels on the Amazon River mainstem. Yet, the implicati...

The spatio-temporal variation of surface water storage (SWS) in the Congo River basin (CRB), the second largest watershed in the world, remains widely unknown. In this study, satellite-derived observations are combined to estimate SWS dynamics at the CRB and sub-basin scales over 1992–2015. Two methods are employed. The first one combines surface w...

The Amazon River basin harbors some of the world's largest wetland complexes, which are of major importance for biodiversity, the water cycle and climate, and human activities. Accurate estimates of inundation extent and its variations across spatial and temporal scales are therefore fundamental to understand and manage the basin's resources. More...

Analyzing historical droughts is essential to improve the assessment of future hydrological risks and to understand the effects of climate variability on streamflow. However, prolonged and consistent hydrological time series are scarce in the Brazilian savanna region. This study aimed to analyze the performance of climate reanalysis products in pre...

Una de las zoonosis de gran impacto es la Leishmaniasis visceral causada por el parásito protozoario Leishmania infantum, transmitida por el vector hembra hematófaga infectada denominada Lutzomyia longipalpis siendo el principal reservorio el perro doméstico, considerada una patología tropical olvidada en 98 países a nivel mundial especialmente en...

Satellite observations offer invaluable insights into hydrological processes and environmental change in the Amazon. The Amazon Basin is the largest river basin in the world. It covers roughly six million square kilometers, which is about one third of South America. While the sheer scale and difficulty of access makes field observations challengin...

The majority of deforestation modelling studies analyze the impacts of forest loss on atmospheric processes at climatological time scales. How deforestation can alter the atmospheric circulation patterns and related rainfall at synoptic intra-seasonal time scale is the main question of this work.

The Southern Amazon forest (south of 8°S) has shown changes in the spatial and temporal patterns of its hydroclimatic components due to a complex interaction between climate and deforestation, which could probably lead to a biophysical transition. Previous research on these interactions either has a large-scale or global focus, or is based on limit...

In the last four decades, the Southern Amazon (south of 8°S) has shown changes in the spatial and temporal patterns of its hydro‐climatic components, leading to drier conditions. Due to climate and land‐use changes, this region is considered as a zone under biophysical transition processes. Previous studies have documented a complex interaction bet...

We analyze the characteristics of atmospheric variations over tropical South America using the pattern recognition framework of weather typing or atmospheric circulation patterns (CPs). During 1979-2020, nine CPs are defined in the region, using a k-means algorithm based on daily unfiltered 850 hPa winds over 0035°N-30°S, 90°W-30°W. CPs are primari...

As the largest river basin on Earth, the Amazon is of major importance to the world's climate and water resources. Over the past decades, advances in satellite‐based remote sensing (RS) have brought our understanding of its terrestrial water cycle and the associated hydrological processes to a new era. Here, we review major studies and the various...

As the largest river basin on Earth, the Amazon is of major importance to the world's climate and water resources. Over the past decades, advances in satellite-based remote sensing (RS) have brought our understanding of its terrestrial water cycle and the associated hydrological processes to a new era. Here, we review major studies and the various...

The southern Amazonia is undergoing a major biophysical transition, involving changes in land use and regional climate. This study provides new insights on the relationship between hydroclimatic variables and vegetation conditions in the upper Madeira Basin (~1 × 10 ⁶ km ² ). Vegetative dynamics are characterised using the normalized difference veg...

Estimating discharges is a major challenge in water resources management, and techniques such as Data Assimilation (DA) can be used to improve these estimates. This study assesses the application of the local ensemble Kalman filter (LEnKF) DA scheme within a large scale hydrological-hydrodynamic model to improve discharge estimates. Different scena...

River floodplains and reservoirs interact throughout a basin drainage network, defining a coupled human-water system with multiple feedbacks. Recent modeling developments have aimed to improve the representation of such processes at regional to continental scales. However, most large-scale hydrological models adopt simplified lumped reservoir schem...

Global estimates of river dynamics are necessary to manage water resources, mainly in developing countries where in-situ observation is limited. Remote sensors such as nadir altimeters can complement ground data. However current altimeters miss a large number of continental surface water bodies, what is expected to be surpassed by the future Surfac...

Global estimates of river dynamics are needed in order to manage water resources, mainly in developing countries where in-situ observation is limited. Remote sensors such as nadir altimeters can complement ground data. Current altimeters miss however a large number of continental surface water bodies. This issue will be largely resolved by the futu...

We analyze the observed relationship between sea surface temperatures (SSTs) over the Atlantic Ocean and Normalized Difference Vegetation Index (NDVI) in the Orinoco and Amazon basins. Monthly correlations between anomalies of NDVI and SSTs are computed for different regions of the Atlantic Ocean. We also use a mixture of observations and reanalysi...

Animated GIF of daily rainfall in South America during the 1983 year.

Animated GIF of return period of daily discharges in South American rivers during the 1983 year.

Large evidences support the strong impacts on rainfall amount and the increasing of dry-season length on the Amazonian forest. All of these effects are usually attributed to large scale atmospheric circulation and to land cover changes as part of anthropogenic effects. In this research we assess statistical and modeling approaches to investigate th...

This study provides a spatio-temporal analysis of the great floods that occurred in South America in 1983 using hydrometeorological data and outputs from a continental-scale hydrological-hydrodynamic model. In the extreme year 1983, there were three main flooding periods (February, June and July) in many South American river basins, such as the Ara...

RESUMO-Modelos hidrológicos regionais têm sido desenvolvidos recentemente de modo a representar, de forma acoplada, processos hidrodinâmicos em rios e planícies de inundação, bem como o efeito de reservatórios. Apresenta-se a aplicação do modelo MGB para a bacia do Alto Paraná (~947.000 km²), considerando propagação hidrodinâmica nas planícies de i...

Study region: Upper Madeira Basin (975,500 km 2) in Southern Amazonia, which is suffering a biophysical transition, involving deforestation and changes in rainfall regime. Study focus: The evolution of the runoff coefficient (Rc: runoff/rainfall) is examined as an indicator of the environmental changes (1982-2017). New hydrological insights for the...

Study region: Upper Madeira Basin (975,500 km2) in Southern Amazonia, which is suffering a biophysical transition, involving deforestation and changes in rainfall regime. Study focus: The evolution of the runoff coefficient (Rc: runoff/rainfall) is examined as an indicator of the environmental changes (1982–2017). New hydrological insights for the...

The identification and estimation of extreme precipitation events is a fundamental step in many hydrologic applications, as for the design of hydraulic structures. For the estimation of Probable-Maximum-Precipitation (PMP) and Probable-Maximum-Flood (PMF) two main methods are typically adopted: the statistical method and the hydrometeorological one...

Estimates of hydrological variables (discharge Q, water surface elevation WSE and flooded water extent FWE) over both space and time are still lacking over most world basins despite their great value for water management. Therefore, Data assimilation (DA) of different present and future remote sensing sources can be an alternative to improve hydrol...

The availability of accurate, distributed spatially and temporally hydroclimatic records, has been a challenge for water resources management worldwide, mainly in developing countries, where in situ observations are limited. Hydrological models have been used to overcome this problem by estimating spatially distributed hydrological and hydraulic va...

In this paper, we present a methodology to map inland water in tropical areas under dense vegetation at high spatial and temporal resolution using multi-source remote sensing data. A new inundation product (SWAF-HR) is presented. It is characterized by a high spatial resolution (30′, 1 km) and high temporal resolution (3 days). The SWAF-HR product...

The availability of adequate and accurate long term hydroclimatic records has been a challenge for water management around the world, especially in developing countries where such information is limited. In recent years, global reanalysis datasets have been developed to provide these records in hydrologic fields. However, many efforts have been lim...

Adequate and accurate hydrological data is necessary to manage water resources, which are critical in developing countries where such information is limited. In recent years, global reanalysis datasets have been developed to provide this information in climatic fields and, more recently, in hydrologic fields. Nevertheless, these latest efforts have...

Estimates of hydrological variables such as discharge (Q), water surface elevation (WSE) and surface water extent (A) over both space and time are still lacking over most world basins despite their great value for water management. Despite several attempts using hydrologic and hydrodynamic models have been carried out to produce such estimates, the...

The technological advance has allowed the cheapening of devices capable of capturing the hydrological impacts generated by disasters, emphasizing here specifically the Unmanned Aerial Vehicles (UAVs) and photographic cameras embarked. In addition, the near-immediate sharing of disasters filmed by UAVs from YouTube posts allows hydrologists to have...

Over the decades, maximum extreme hydrological events have reached Brazilian municipalities causing tangible and intangible damage. To understand these events, the hydrological and hydrodynamic reconstruction aims to represent the past event in order to study the importance of the forcing agents involved and their interactions, as well as the catch...

Over the decades, maximum extreme hydrological events have reached Brazilian municipalities causing tangible and intangible damage. To understand these events, the hydrological and hydrodynamic reconstruction aims to represent the past event in order to study the importance of the forcing agents involved and their interactions, as well as the catch...

Projections of climate change are essential to guide sustainable development plans in the tropical Andean countries such as Peru. This study assessed the projections of precipitation and potential evaporation, rain erosive potential, and precipitation concentration in the Mantaro River Basin, in the Peruvian Andes, which is important for agricultur...

Resumo-A América do Sul é responsável por 30% da vazão afluente aos oceanos, apresenta ampla diversidade hidrológica, importantes ecossistemas e seus recursos hídricos são compartilhados por diversos países, e diferentes setores econômicos, mas que também sofrem com impactos de cheias e secas. Avanços em modelos de simulação e sensoriamento remoto...

Precipitation is one of the hydrological variables that has high difficulty level to estimate and has a great importance to many applications. Trying to solve this limitation, many products have been produced to estimate rainfall over quasi global coverage and usually used in places without data. The most recent of them is provided by Multi-Source...

Recent studies have reported an increase in intensity and frequency of hydrological extreme events in many regions of the Amazon basin over last decades, these events such as seasonal floods and droughts have originated a significant impact in human and natural systems. Recently, methodologies such as climatic reanalysis are being developed in orde...

Recently developed methodologies such as climate reanalysis make it possible to create a historical record of climate systems. This paper proposes a methodology called Hydrological Retrospective (HR), which essentially simulates large rainfall datasets, using this as input into hydrological models to develop a record of past hydrology, making it po...

Soil degradation by water erosion has been accelerated by human activities. This process is aggravated in the Andes region due to steep slopes, sparse vegetation cover, and sporadic but high intensity rainfall, which together with a shallow soil depth, increases soil erosion risk. The objective of this study was to analyze the soil erosion risk, as...