Marie-Paule Bonnet

Institute of Research for Development | IRD · Environment and Resources Department

Soil salinization will affect 50% of global cropland areas by 2050 and represents a major threat to agricultural production and food sovereignty. As soil salinity monitoring is costly and time consuming, many regions of the world undertake very limited soil salinity observation (in space and time), preventing the accurate assessment of soil salinit...

Several recent studies have evidenced the relevance of machine-learning for soil salinity mapping using Sentinel-2 reflectance as input data and field soil salinity measurement (i.e., Electrical Conductivity-EC) as the target. As soil EC monitoring is costly and time consuming, most learning databases used for training/validation rely on a limited...

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...

Although Brazil is among the world's largest consumers of pesticides, their impacts on local populations have struggled to emerge as a public problem due to a political context that is particularly favourable to industrial agriculture. In this article, we investigate how the knowledge produced on the impact of pesticides contributes (or not) to the...

Theoretical trends in agent-based modeling (ABM) draw sharp lines that usually limit the expressiveness of models to fit their methodological box: KISS puts emphasis on parsimonious and tractable model for systematic simulation analysis, KIDS focuses on the use of data for model specification and simulation validation, while KILT highlights the inv...

The Amazon floodplains are complex systems influenced by the annual hydrological regime with an effect on the structuring of physical, chemical and biological processes. Thus, we evaluated the relationship of environmental factors with the composition and variation of functional groups based on morphology (MBFG) during the hydrological year in an A...

In this study, 16 satellite-based precipitation products (SPPs) comprising satellite, gauge and reanalysis datasets were assessed on a monthly time step using precipitation data from 11 gauge stations across Nigeria within the 2000–2012 period as reference. Despite the ability of some of the SPPs to reproduce the salient north–south pattern of the...

Understanding the mechanisms that generate organism distribution patterns from the beta diversity perspective can assist in environmental monitoring strategies. In this study, we emphasized the limnic zooplankton due to the ability of these organisms to respond quickly to environmental variations. Therefore, we evaluated the following questions: (i...

The contamination of coastal environments by metallurgical wastes involves multiple biogeochemical processes; accordingly, understanding metal behavior and risk evaluation of contaminated areas, such as Sepetiba Bay (Rio de Janeiro, Brazil), remains challenging. This study coupled Zn isotopic analyses with sequential extractions (BCR) to investigat...

Scarcity of water temperature data in rivers may limit a diversity of studies considering this property, which regulates many physical, chemical, and biological processes. We present a robust method to generate a consistent, continuous daily river water temperature (RWT) data series for medium and large rivers using the combined techniques of remot...

In the Lago Grande de Curuaí, a floodplain of the Amazon River, located close to the city of Santarem (Brazil), the inhabitants have always adapted their activities (centered on agriculture, fishing, cattle raising) to the seasonal fluctuations of the water level. Historically, strong floods occurred about every 20 years, but recently, they have oc...

O lago Poópo é o segundo maior lago da Bolívia e atualmente vem passando por uma forte crise hídrica que alguns autores associam diretamente a mudança de ocupação da terra. Neste trabalho foi realizada a classificação do uso e ocupação do solo na sub-bacia P6 do lago entre os anos de 1985 e 2017. Foi analisado o desempenho dos classificadores SVM (...

Canadian Water Quality Index (CWQI) provides protection for freshwater life promoting healthy ecosystems and safeguarding human health. Biological Diatom Index (BDI) was developed to indicate the ecological status and water quality of freshwater systems. This paper evaluates the relations between the two different indices. During rising and falling...

[This corrects the article DOI: 10.1371/journal.pone.0220695.].

Flooding dynamics across a medium‐size (Janauacá Lake, 786 km2) floodplain system along the Amazon/Solimões River over a 9‐years period (2006–2015) is studied through integration of remote sensing and limited in situ data in hydrologic‐hydrodynamic modelling based on Telemac‐2D model. We firstly detail the methodological approach and the modelling...

This study aims reporting on 23 gridded precipitation datasets (P-datasets) reliability across West Africa through direct comparisons with rain gauges measurement at the daily and monthly time scales over a 4 years period (2000-2003). All P-datasets reliability vary in space and time. The most efficient P-dataset in term of Kling–Gupta Efficiency (...

In three-dimensional simulations of free-surface flow where the vertical velocities are relevant, such as in lakes, estuaries, reservoirs, and coastal zones, a nonhydrostatic hydrodynamic approach may be necessary. Although the nonhydrostatic hydrodynamic approach improves the physical representation of pressure, acceleration and velocity fields, i...

Amazonian floodplains ensure fundamental hydro-ecological functions and support a high level of biodiversity. Transformation in the Amazon basin, land use changes, dam construction and climate variability, increasingly threaten these emblematic ecosystems. In view of supporting their conservation, it is important to monitor the spatiotemporal distr...

During the last decades, agriculture has drastically increased over the South American Andean Plateau (Altiplano), resulting in extensive changes in land cover from native vegetation to essentially Quinoa crop. Along with climatic variability, these land use changes appear as a catalyst in worsening the already existing drought events and water sca...

Amazonian floodplains form complex hydrological networks that play relevant roles in global biogeochemical cycles, and bacterial degradation of the organic matter in these systems is key for regional carbon budget. The Amazon undergoes extreme seasonal variations in water level, which produces changes in landscape and diversifies sources of organic...

Many trophic indices have been constructed for temperate aquatic environments, but few have proved reliable for tropical environments. Indices constructed on the basis of nutrients may not be effective for describing the trophic state because the fractions of nitrogen and phosphorus differ in their potential to predict the nutrient limitation in tr...

Amazonian aquatic environments are complex, and their interaction promotes heterogeneous environments that in turn make it difficult to describe the development of patterns. Amazonian floodplain lakes have different environmental and biological responses in similar water periods due to the interannual variation. We evaluated if the interannual vari...

Lake Titicaca is a crucial water resource in the central part of the Andean mountain range, and it is one of the lakes most affected by climate warming. Since surface evaporation explains most of the lake's water losses, reliable estimates are paramount to the prediction of global warming impacts on Lake Titicaca and to the region's water resource...

This paper proposes a protocol to assess the space–time consistency of 12 satellite-based precipitation products (SPPs) according to various indicators, including (i) direct comparison of SPPs with 72 precipitation gauges; (ii) sensitivity of streamflow modelling to SPPs at the outlet of four basins; and (iii) the sensitivity of distributed snow mo...

The processes in tropical floodplain lakes enable maintaining phytoplankton nutrient requirements over a hydrological year. The nutrients such as nitrogen, phosphorus and carbon compounds play an essential role in phytoplankton growth. However, the way that nutrients and phytoplankton interact and how this relationship varies seasonally in tropical...

This paper presents the interest of a highly sensitive biosensor coated with a TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mesoporous film as a sensitive layer. The main novelty is related to the modeling of the device and simulation by using the finite element method with a COMSOL mult...

This paper proposes a protocol to assess the space-time consistency of satellite precipitation estimates (SPEs) according to various indicators including: (i) direct comparison of SPEs with 72 precipitation gauges; (ii) sensitivity of streamflow modelling to SPEs at the outlet of four basins; and (iii) the sensitivity of distributed snow models to...

Launched in 2014, the Global Precipitation Measurement (GPM) mission aimed at ensuring the continuity with the Tropical Rainfall Measuring Mission (TRMM) launched in 1997 that has provided unprecedented accuracy in Satellite Precipitation Estimates (SPEs) on the near-global scale. Since then, various SPE versions have been successively made availab...

Lake Titicaca is an important water ecosystem of South America. Due to uncertainties in estimating the evaporation losses from the lake, surface water storage calculations are uncertain. In this paper, we try to improve evaporation loss estimations by comparing different methods to calculate daily and monthly evaporation from Lake Titicaca. These w...

The present study aims at the assessment of six satellite rainfall estimates (SREs) in Pakistan. For each assessed products, both real-time (RT) and post adjusted (Adj) versions are considered to highlight their potential benefits in the rainfall estimation at annual, monthly, and daily temporal scales. Three geomorphological climatic zones, i.e.,...

Resumo. A augmentacao do poder computaçional e dos dados de sensoriamento remoto abriram 4 novos horizontes para monitorar hidrológicos eventos. Tambem, existe uma necessidade no 5 monitoramento da bacia amazônica que enfrenta uma antropização crescente e eventos hidrológicos 6 extremos. A modelagem hidrodinâmica gera novas informações. Utilizamos...

In the world richest biotope, wetlands, and specially floodplains, remain particularly active zones in terms of nutrients, biodiversity, flows spreading, sediment transfer and human activities. Today, these sensitive zones are facing increasing human pressures and augmentation in frequency and intensity of extreme events. The impact of such extreme...

In the world’s richest biotope, wetlands, and especially floodplains, remain particularly active zones in terms of nutrients, biodiversity, flows spreading, sediment transfer, and human activities. Today, these sensitive zones are facing increasing human pressures and augmentation in frequency and intensity of extreme hydrological events. The impac...

The new IMERG and GSMaP-v6 satellite rainfall estimation (SRE) products from the GPM mission have been available since January 2015. With a finer spatial resolution of 0.1°, these products should provide more accurate information than their latest widely adapted (relatively coarser spatial scale, 0.25°) counterpart (TMPA product). The present study...

In May 2016, a new Digital Elevation Model (DEM) called ALOS-DEM was made available by the Japan Aerospace Exploration Agency (JAXA). With a resolution of 30 m the ALOS-DEM bring valuable information over remote regions. The ALOS-DEM is assessed for the first time and over the South American Andean Plateau considering both vertical and relative acc...

The new IMERG and GSMaP-v6 satellite rainfall estimation (SRE) products from the Global Precipitation Monitoring (GPM) mission have been available since January 2015. With a finer grid box of 0.1°, these products should provide more detailed information than their latest widely-adapted (relatively coarser spatial scale, 0.25°) counterpart. Integrat...

In 2015, an emergency state was declared in Bolivia when Poopó Lake dried up. Climate variability and the increasing need for water are potential factors responsible for this situation. Because field data are missing over the region, no statements are possible about the influence of mentioned factors. This study is a preliminary step toward the und...

In the Amazon Basin, floodplains form a complex mosaic of freshwater systems with differing morphologies, resulting in varied inundation patterns and heterogeneous chemical and ecological characteristics. In this study, we focused on the Janauacá floodplain, a medium-sized system (786 km2, including the local watershed) located along the Solimões R...

In the low Amazonian basin, interactions between floodplains and river channels are important in terms of water exchanges, sediments, or nutrients. These floodplains and wetlands are considered as hotspot of biodiversity.They are among the most productive in the world. However, they are threatened by climatic changes and anthropic activities. Hence...

Rainfall is considered to be a prime driver in triggering of climate extremes (flooding and droughts) throughout the globe. For the management of economic, social and environmental impacts of these extremes, various Hazard Assessment Models (HAMs) available and proposed. Major barrier in the use of such HAMs lies in the preparation of their input d...

Poster

Previously available only over the Continental United States (CONUS), the 1 arc-second mesh size (spatial resolution) SRTM-GL1 (Shuttle Radar Topographic Mission – Global 1) product has been freely available worldwide since November 2014. With a relatively small mesh size, this digital elevation model (DEM) provides valuable topographic information...

In this study, rating curves (RCs) were determined by applying satellite altimetry to a poorly gauged basin. This study demonstrates the synergistic application of remote sensing and watershed modeling to capture the dynamics and quantity of flow in the Amazon River Basin, respectively. Three major advancements for estimating basin-scale patterns i...

The large floodplains associated with the Amazon River and its main tributaries affect water transport, influence sediment and chemical budgets and support highly diverse ecosystems and productive fisheries. Approximately 25% of the Amazon River discharge is routed through these systems along a 2,000 km reach between Sao Paulo de Olivença and Óbido...

The large floodplains associated with the Amazon River and its main tributaries affect water transport, influence sediment and chemical budgets and support highly diverse ecosystems and productive fi sheries. Approximately 25% of the Amazon River discharge is routed through these systems along a 2,000 km reach between Sao Paulo de Olivença and 6bid...

In the Amazon basin, the recently released SRTM Global 1 arc-second (SRTMGL1) remains the best topographic information for hydrological and hydrodynamic modeling purposes. However, its accuracy is hindered by errors, partly due to vegetation, leading to erroneous simulations. Previous efforts to remove the vegetation signal either did not account f...

Resumo-Previamente disponível sobre os Estados Unidos continentais, o Modelo Digital de Elevação (DEM) SRTM-GL1, foi recentemente disponibilizado em âmbito mundial gratuitamente. Com uma resolução espacial de 30 m esse modelo deveria fornecer informações topográficas precisas nas regiões isoladas. Essas informações são essências para a caracterizaç...

Resumo. Modelos Digitais de Elevação (MDEs) são atualmente utilizados em modelagem hidrológica e hidrodinâmica. Na bacia Amazônica, o SRTM-GL1 ainda é o único e a melhor informação topográfica disponível em escala adequada para estudos de várzea. Entretanto, sua precisão é dificultada por vários erros em parte devido ao dossel florestal. No caso de...

Digital Elevation Models (DEMs) are currently used for hydrological and hydrodynamic modeling purposes. In the Amazon basin, the SRTM-GL1 is still the only and best available topographic information at a scale suitable for floodplain studies. Its accuracy is however hindered by various errors partly due to vegetation canopy. In the case of floodpla...

Previamente avaliado sobre os Estados Unidos Continentais (CONUS), os Modelo Digital de Elevação (DEM) SRTM-GL1 foi recentemente disponibilizado em âmbito mundial gratuitamente. Com uma alta resolução espacial, esse modelo fornece informações de valores topográficos também em regiões remotas. SRTM-GL1 foi utilizado para estudo em termos de exatidão...

O uso de grupos substitutos em programas de biomonitoramento tem sido proposto para minimizar os altos custos financeiros e tempo para processamento das amostras. Os objetivos deste estudo foram avaliar a correlação entre (i) a distribuição espacial nos principais grupos zooplanctônicos (cladóceros, copépodes, protozoários testáceos e rotíferos), (...

Nine satellite rainfall estimations (SREs) were evaluated for the first time over the South American Andean plateau watershed by comparison with rain gauge data acquired between 2005 and 2007. The comparisons were carried out at the annual, monthly and daily time steps. All SREs reproduce the salient pattern of the annual rain field, with a marked...

Resumo: Six products of satellite rainfall estimation were evaluated by comparison with rainfall gauges data acquired between 2005 and 2007 in the Andean Altiplano watershed. Comparisons were done on annual, monthly, 15 days and daily time scales. The results differ from one product to another and in function of the considered time scale. The evalu...

A set of altimetry-based rating curves have been obtained by polynomial fit of ENVISAT water stages and discharges obtained from MGB-IPH model, with constraints on parameters values. The rated discharges, e.g. the discharge obtained from ENVISAT heights through the rating curves were successfully validated towards simulated discharges (meanEns = 0,...

The new Global Digital Elevation Model (GDEM v2) has been available since 17 October 2011. With a resolution of approximately 30 m, this model should provide more accurate information than the latest version of Shuttle Radar Topographic Mission (SRTM v4) with a resolution of 90 m outside of the USA. The accuracies of these two recently released dig...

One critical concern for Thailand reservoirs which are used for irrigated agriculture (mainly paddy rice) and aquaculture is the lack of information on contamination from trace metal element (TME) in waters and biological compartments of the reservoirs. TME are both from natural and anthropogenic origins and may affect the quality of lake waters an...

Diurnal variations in surface circulation, heat budget and thermal structure were investigated in a tropical reservoir using a synergistic approach that combines in situ observations, remote-sensing data and numerical modelling. The study area, the Itumbiara Reservoir (Brazil) at the beginning of the austral winter, is characterized by the presence...

The Amazonian basin is the largest hydrological basin all over the world. Over the past few years, it has experienced an unusual succession of extreme droughts and floods, which origin is still a matter of debate. One of the major issues in understanding such events is to get discharge series distributed over the entire basin. Satellite altimetry c...

[1] Groundwater plays a fundamental role in rainforest environments, as it is connected with rivers, lakes and wetlands, and helps to support wildlife habitat during dry periods. Groundwater reservoirs are however excessively difficult to monitor, especially in large and remote areas. Using concepts from groundwater-surface water interactions and E...

Resumo – O objetivo deste estudo é relacionar o comportamento da altura da lâmina de água com episódios de precipitação no lago Curupira, baseados em dados altimétricos (intervalos de 35 dias) e pluviométricos (diários), durante o período de 2002 a 2010, obtidos utilizando-se dados de precipitação do satélite TRMM e dados altimétricos do satélite E...

Resumo – Apresenta-se o desenvolvimento e avaliação de um esquema de assimilação de dados de vazão e níveis d'água aplicado em um modelo hidrológico-hidrodinâmico para previsão de vazões na bacia Amazônica. Utilizou-se o modelo hidrológico MGB-IPH acoplado a um modelo hidrodinâmico nos rios. A técnica Ensemble Kalman Filter-EnKF foi utilizada para...