Clément Duvert

Charles Darwin University

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Lindsay B. Hutley

Charles Darwin University

Christian Birkel

Universidad de Costa Rica

Nicolas Gratiot

Institut des Géosciences de l'Environnement

Julien Némery

Centre National de la Recherche Scientifique

Diοni I. Cendón

Australian Nuclear Science and Technology Organisation

Samantha A. Setterfield

University of Western Australia

Matthias Raiber

Commonwealth Scientific and Industrial Research Organisation

Niels C. Munksgaard

James Cook University

Danlu Guo

Australian National University

Oldřich Navrátil

Environnement, ville, société

Cooperative Institutions

Centre National de la Recherche Scientifique

Charles Darwin University

Institut de Recherche pour le Développement

National Centre for Groundwater Research and Training

Université Grenoble Alpes

University of Western Australia

Flinders University

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

University of Melbourne

James Cook University

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Seasonal and spatial variations in rare earth elements to identify inter-aquifer linkages and recharge processes in an Australian catchment

Chemical Geology (2015)

Clément Duvert Diοni I. Cendón Matthias Raiber Jean‐Luc Seidel Malcolm Cox

Bedrock

10.1016/j.chemgeo.2014.12.022

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Citations (36)

Measuring Gas Transfer Velocity in a Steep Tropical Stream: Method Evaluation and Implications for Upscaling

Journal of Geophysical Research Biogeosciences (2025)

Adam T. Rexroade Marcus B. Wallin Clément Duvert

Abstract Greenhouse gas emission estimates from streams rely, in part, on accurate measurements or estimates of the gas transfer velocity, which describes the physical efficiency for gas exchange across the water‐air interface. Numerous methods for measuring or modeling gas transfer velocity exist, yet few studies compare these different methods. Additionally, current models of gas transfer velocity in streams are predominantly derived from measurements in low‐gradient, temperate, or boreal streams. Here, we measured gas transfer velocity using four different methods in a high‐energy, tropical headwater stream under a range of flow conditions, and compared these measurements to indirect estimates from four empirical models. Our results show that, when compared to the use of a biologically inert gas tracer (propane), floating chambers produced lower gas transfer velocity values. Using carbon dioxide (CO 2 ) as a tracer gas was unreliable without considering other natural sources and sinks of CO 2 and yielded gas transfer velocities lower than when using propane. Existing empirical models tended to underestimate gas transfer velocity, compared to the inert tracer gas. When using empirical models to upscale the emission flux along an entire stream reach, choice of model was more influential than the spatial resolution of model implementation. We also highlight the extreme spatial variability of gas transfer velocity across small spatial scales, which contrasts with its relative stability across changing hydrological conditions. The discrepancies between methods highlight the need for further research in measuring and upscaling gas transfer velocity, particularly in very turbulent steep streams.

10.1029/2024jg008420

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Hydrochemical processes in a shallow coal seam gas aquifer and its overlying stream–alluvial system: implications for recharge and inter-aquifer connectivity

Applied Geochemistry (2015)

Clément Duvert Matthias Raiber Daniel D.R. Owen Diοni I. Cendón Christelle Batiot‐Guilhe

10.1016/j.apgeochem.2015.05.021

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Citations (18)

End member and Bayesian mixing models consistently indicate near‐surface flowpath dominance in a pristine humid tropical rainforest

Hydrological Processes (2021)

Christian Birkel Alicia Correa Clément Duvert Sebastián Granados Bolaños Andres Chavarría Palma

Abstract The impacts of forest conversion on runoff generation in the tropics have received much interest, but scientific progress is still hampered by challenging fieldwork conditions and limited knowledge about runoff mechanisms. Here, we assessed the runoff generation, flow paths and water source dynamics of a pristine rainforest catchment in Costa Rica using end member mixing analysis (EMMA) and a Bayesian mixing model (MixSIAR). Geochemical tracer data collected over a 4‐week field campaign were combined with tritium data used to assess potential deeper groundwater flow pathways to the perennial stream. The streamflow composition was best captured using three end‐members, namely throughfall, shallow (5–15 cm) and deeper (15–50 cm) soil water. We estimated the end‐member contributions to the main stream and two tributaries using the two mixing approaches and found good agreement between results obtained from EMMA and MixSIAR. The system was overwhelmingly dominated by near‐surface sources, with little evidence for deeper and older groundwater as tritium‐derived baseflow mean transit time was between 2.0 and 4.4 years. The shallow soil flow pathway dominated streamflow contributions in the main stream (median 39% and 49% based on EMMA and MixSIAR, respectively), followed by the deeper soil (32% and 31%) and throughfall (25% and 19%). The two tributaries had even greater shallow soil water contributions relative to the main stream (83% and 74% for tributary A and 42% and 63% for tributary B). Tributary B had no detectable deep soil water contribution, reflecting the morphology of the hillslope (steeper slopes, shallower soils and lower vegetation density compared to hillslope A). Despite the short sampling campaign and associated uncertainties, this study allowed to thoroughly assess runoff generation mechanisms in a humid tropical catchment. Our results also provide a first comparison of two increasingly used mixing models and suggest that EMMA and MixSIAR yield comparable estimates of water source partitioning in this tropical, volcanic rainforest environment.

Base flow

Dominance (genetics)

Perennial stream

10.1002/hyp.14153

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Citations (24)

Baseflow control on sediment flux connectivity: Insights from a nested catchment study in Central Mexico

CATENA (2011)

Clément Duvert Nicolas Gratiot Roberto Anguiano-Valencia Julien Némery Manuel E. Mendoza

Base flow

Deposition

Aggradation

10.1016/j.catena.2011.05.021

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Citations (17)

Preface special issue: “Processes and patterns in tropical hydrology”

Hydrological Processes (2023)

Christian Birkel Clément Duvert Alicia Correa A. Brena

This is the preface to an SI.

10.1002/hyp.14931

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Citations (1)

The use of regional and alluvial groundwater by riparian trees in the wet‐dry tropics of northern Australia

Hydrological Processes (2021)

Caroline A. Canham Clément Duvert Leah Beesley Michael M. Douglas Samantha A. Setterfield

Abstract Riparian trees play a critical role in the ecological function of rivers, yet are threatened by anthropogenic change to the hydrological cycle. Identifying the sources of water used by riparian trees can inform sustainable water policy. We used isotopic analysis complemented by measurements of plant water relations to assess water sources for riparian trees at two sites with contrasting hydrogeological processes; one with an alluvial aquifer overlaying an aquitard, and one where fault‐induced preferential pathways in the aquitard allowed the flow of deeper, older groundwater from a regional aquifer to the alluvium. At both sites, plant water potential, stomatal conductance, and plant water isotope composition in the xylem sap of riparian trees were collected from two landscape positions, the riverbank and floodplain. We used a Bayesian mixing model (MixSIAR) to assess differences in the proportion of water sources for sites and landscape positions. We found that xylem water isotope values differed between the two sites in line with their hydrogeological characteristics, with trees at the regional aquifer site using water sourced from the regional groundwater and trees at the site with only an alluvial aquifer present using a mixture of water sources, with no dominant source identified. Higher plant predawn water potential values at the regional site indicated greater water availability and support the inference that plants were using more groundwater at the regional site compared to the alluvial site. Trees closer to the river had higher isotope values, indicative of surficial water sources i.e. shallow soil water and river water. Our findings show that the water sources used by riparian trees reflect local hydrogeology and resource availability. Water managers should identify and protect plant water sources to ensure maintenance of riparian trees.

10.1002/hyp.14180

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Citations (15)

Drivers of erosion and suspended sediment transport in three headwater catchments of the Mexican Central Highlands

Geomorphology (2010)

Clément Duvert Nicolas Gratiot Olivier Evrard Oldřich Navrátil Julien Némery

Siltation

Sedimentary budget

10.1016/j.geomorph.2010.07.016

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Citations (103)

Spatial and temporal dynamics of sediment in contrasted mountainous watersheds (Mexican transvolcanic belt and French Southern Alps) combining river gauging, elemental geochemistry and fallout radionuclides

AGUFM (2009)

Olivier Evrard Oldřich Navrátil Nicolas Gratiot Julien Némery Clément Duvert

Source

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Controls on Spatial Variability in Mean Concentrations and Export Patterns of River Chemistry Across the Australian Continent

Water Resources Research (2022)

Shuci Liu Rémi Dupas Danlu Guo Anna Lintern Camille Minaudo

Abstract The state and dynamics of river chemistry are influenced by both anthropogenic and natural catchment characteristics. However, understanding key controls on catchment mean concentrations and export patterns comprehensively across a wide range of climate zones is still lacking, as most of this research is focused on temperate regions. In this study, we investigate the catchment controls on mean concentrations and export patterns (concentration – discharge relationship, C–Q slope) of river chemistry, using a long‐term data set of up to 507 sites spanning five climate zones (i.e., arid, Mediterranean, temperate, subtropical, tropical) across the Australian continent. We use Bayesian model averaging (BMA) and hierarchical modeling (BHM) approaches to predict the mean concentrations and export patterns and compare the relative importance of 26 catchment characteristics (e.g., topography, climate, land use, land cover, soil properties and hydrology). Our results demonstrate that mean concentrations result from the interaction of catchment indicators and anthropogenic factors (i.e., land use, topography and soil), while export patterns are influenced by topography. We also found that incorporating the effects of climate zones in a BHM framework improved the predictability of both mean concentrations and C–Q slopes, suggesting the importance of climatic controls on hydrological and biogeochemical processes. Our study provides insights into the contrasting effects of catchment controls across different climate zones. Investigating those controls can inform sustainable water quality management strategies that consider the potential changes in river chemistry state and export behavior.

Biogeochemical Cycle

Land Cover

Representative Concentration Pathways

10.1029/2022wr032365

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Citations (10)