Laurie Boithias

Université Toulouse III - Paul Sabatier

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Co-Authors

Olivier Ribolzi

Université de Toulouse

Norbert Silvera

Université Paris-Est Créteil

Sabine Sauvage

Laboratoire Écologie Fonctionnelle et Environnement

J.M. Sánchez-Pérez

Centre National de la Recherche Scientifique

Emma Rochelle‐Newall

Centre National de la Recherche Scientifique

Alain Pierret

Institut de Recherche pour le Développement

Bounsamay Soulileuth

Rural Development Agency

Chanthamousone Thammahacksa

Institut de Recherche pour le Développement

Keooudone Latsachack

Institut d'écologie et des sciences de l'environnement de Paris

Oloth Sengtaheuanghoung

Ministry of Agriculture and Forestry

Cooperative Institutions

Centre National de la Recherche Scientifique

193

Institut de Recherche pour le Développement

130

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

Université Toulouse III - Paul Sabatier

Université de Toulouse

Université Grenoble Alpes

Sorbonne Université

Université de Montpellier

Institut des Géosciences de l'Environnement

Institut polytechnique de Grenoble

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Papers

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Effect of land use and hydrological processes on Escherichia coli concentrations in streams of tropical, humid headwater catchments

Scientific Reports (2016)

Emma Rochelle‐Newall Olivier Ribolzi Marion Viguier Chanthamousone Thammahacksa Norbert Silvera

Abstract Lack of access to clean water and adequate sanitation continues to be a major brake on development. Here we present the results of a 12-month investigation into the dynamics of Escherichia coli , a commonly used indicator of faecal contamination in water supplies, in three small, rural catchments in Laos, Thailand and Vietnam. We show that land use and hydrology are major controlling factors of E. coli concentrations in streamwater and that the relative importance of these two factors varies between the dry and wet seasons. In all three catchments, the highest concentrations were observed during the wet season when storm events and overland flow were highest. However, smaller peaks of E. coli concentration were also observed during the dry season. These latter correspond to periods of intense farming activities and small, episodic rain events. Furthermore, vegetation type, through land use and soil surface crusting, combined with mammalian presence play an important role in determining E. coli loads in the streams. Finally, sampling during stormflow revealed the importance of having appropriate sampling protocols if information on maximum contamination levels is required as grab sampling at a fixed time step may miss important peaks in E. coli numbers.

Wet season

Dry season

10.1038/srep32974

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Citations (63)

Assessment of the water supply:demand ratios in a Mediterranean basin under different global change scenarios and mitigation alternatives

The Science of The Total Environment (2013)

Laurie Boithias Vicenç Acuña Laura Vergoñós Guy Ziv Rafael Marcé

Provisioning

Scarcity

Water use

Mediterranean Basin

10.1016/j.scitotenv.2013.10.003

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Citations (203)

Environmental fate and ecotoxicological risk of the antibiotic sulfamethoxazole across the Katari catchment (Bolivian Altiplano): Application of the GREAT-ER model

The Science of The Total Environment (2017)

D. Archundia Laurie Boithias Céline Duwig Marie‐Christine Morel Gabriela Patricia Flores Avilés

Dry season

10.1016/j.scitotenv.2017.12.026

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Citations (39)

Featured Series Conclusion: SWAT Applications for Emerging Hydrologic and Water Quality Challenges

JAWRA Journal of the American Water Resources Association (2017)

Venkatesh Merwade Claire Baffaut Katrin Bieger Laurie Boithias Hendrik Rathjens

Research center

10.1111/1752-1688.12601

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Citations (2)

Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Water (2017)

Laurie Boithias Sabine Sauvage Anneli Lenica Hélène Roux Karim C. Abbaspour

Flash floods are natural phenomena with environmental, social and economic impacts. To date, few numerical models are able to simulate hydrological processes at catchment scale at a reasonable time scale to describe flash events with accurate details. Considering a ~810 km2 Mediterranean river coastal basin (southwestern France) as a study case, the objective of the present study was to assess the ability of the sub-daily module of the lumped Soil and Water Assessment Tool (SWAT) to simulate discharge (1) time-continuously, by testing two sub-basin delineation schemes, two catchment sizes, and two output time-steps; and (2) at flood time-scale, by comparing the performances of SWAT to the performances of the event-based fully distributed MARINE model when simulating flash flood events. We showed that there was no benefit of decreasing the size of the minimum drainage area (e.g., from ~15 km2 down to ~1 km2) when delineating sub-basins in SWAT. We also showed that both the MARINE and SWAT models were equally able to reproduce peak discharge, flood timing and volume, and that they were both limited by rainfall and soil data. Hence, the SWAT model appears to be a reliable modelling tool to predict discharge over long periods of time in large flash-flood-prone basins.

Flash flood

SWAT model

Hydrological modelling

10.3390/w9120929

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Citations (90)

Evaluation of precipitation products for small karst catchment hydrological modeling in data-scarce mountainous regions

Journal of Hydrology (2024)

Ibrahim Al Khoury Laurie Boithias Vianney Sivelle Ryan T. Bailey Salam A. Abbas

Catchment hydrology

10.1016/j.jhydrol.2024.132131

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Citations (0)

Modeling the Fate and Transport of Malathion in the Pagsanjan-Lumban Basin, Philippines

Water (2017)

Mayzonee Ligaray Minjeong Kim Sang‐Soo Baek Jin‐Sung Ra Jong Ahn Chun

Exposure to highly toxic pesticides could potentially cause cancer and disrupt the development of vital systems. Monitoring activities were performed to assess the level of contamination; however, these were costly, laborious, and short-term leading to insufficient monitoring data. However, the performance of the existing Soil and Water Assessment Tool (SWAT model) can be restricted by its two-phase partitioning approach, which is inadequate when it comes to simulating pesticides with limited dataset. This study developed a modified SWAT pesticide model to address these challenges. The modified model considered the three-phase partitioning model that classifies the pesticide into three forms: dissolved, particle-bound, and dissolved organic carbon (DOC)-associated pesticide. The addition of DOC-associated pesticide particles increases the scope of the pesticide model by also considering the adherence of pesticides to the organic carbon in the soil. The modified SWAT and original SWAT pesticide model was applied to the Pagsanjan-Lumban (PL) basin, a highly agricultural region. Malathion was chosen as the target pesticide since it is commonly used in the basin. The pesticide models simulated the fate and transport of malathion in the PL basin and showed the temporal pattern of selected subbasins. The sensitivity analyses revealed that application efficiency and settling velocity were the most sensitive parameters for the original and modified SWAT model, respectively. Degradation of particulate-phase malathion were also significant to both models. The rate of determination (R2) and Nash-Sutcliffe efficiency (NSE) values showed that the modified model (R2 = 0.52; NSE = 0.36) gave a slightly better performance compared to the original (R2 = 0.39; NSE = 0.18). Results from this study will be able to aid the government and private agriculture sectors to have an in-depth understanding in managing pesticide usage in agricultural watersheds.

Pesticide application

SWAT model

10.3390/w9070451

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Citations (22)

Distribution of Burkholderia pseudomallei within a 300-cm deep soil profile: implications for environmental sampling

Scientific Reports (2022)

Khemngeun Pongmala Alain Pierret Priscia Oliva Anne Pando Viengmon Davong

Abstract The environmental distribution of Burkholderia pseudomallei , the causative agent of melioidosis, remains poorly understood. B. pseudomallei is known to have the ability to occupy a variety of environmental niches, particularly in soil. This paper provides novel information about a putative association of soil biogeochemical heterogeneity and the vertical distribution of B. pseudomallei . We investigated (1) the distribution of B. pseudomallei along a 300-cm deep soil profile together with the variation of a range of soil physico-chemical properties; (2) whether correlations between the distribution of B. pseudomallei and soil physico-chemical properties exist and (3) when they exist, what such correlations indicate with regards to the environmental conditions conducive to the occurrence of B. pseudomallei in soils. Unexpectedly, the highest concentrations of B. pseudomallei were observed between 100 and 200 cm below the soil surface. Our results indicate that unravelling the environmental conditions favorable to B. pseudomallei entails considering many aspects of the actual complexity of soil. Important recommendations regarding environmental sampling for B. pseudomallei can be drawn from this work, in particular that collecting samples down to the water table is of foremost importance, as groundwater persistence appears to be a controlling factor of the occurrence of B. pseudomallei in soil.

Burkholderia pseudomallei

Melioidosis

Biogeochemical Cycle

10.1038/s41598-022-12795-0

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Citations (11)

Intermittent rivers and ephemeral streams: Perspectives for critical zone science and research on socio‐ecosystems

Wiley Interdisciplinary Reviews Water (2021)

Ophélie Fovet Axel Belemtougri Laurie Boithias Isabelle Braud Jean‐Baptiste Charlier

Abstract Intermittent rivers and ephemeral streams (IRES) are now recognized to support specific freshwater biodiversity and ecosystem services and represent approximately half of the global river network, a fraction that is likely to increase in the context of global changes. Despite large research efforts on IRES during the past few decades, there is a need for developing a systemic approach to IRES that considers their hydrological, hydrogeological, hydraulic, ecological, and biogeochemical properties and processes, as well as their interactions with human societies. Thus, we assert that the interdisciplinary approach to ecosystem research promoted by critical zone sciences and socio‐ecology is relevant. These approaches rely on infrastructure—Critical Zone Observatories (CZO) and Long‐Term Socio‐Ecological Research (LTSER) platforms—that are representative of the diversity of IRES (e.g., among climates or types of geology. We illustrate this within the French CZO and LTSER, including their diversity as socio‐ecosystems, and detail human interactions with IRES. These networks are also specialized in the long‐term observations required to detect and measure ecosystem responses of IRES to climate and human forcings despite the delay and buffering effects within ecosystems. The CZO and LTSER platforms also support development of innovative techniques and data analysis methods that can improve characterization of IRES, in particular for monitoring flow regimes, groundwater‐surface water flow, or water biogeochemistry during rewetting. We provide scientific and methodological perspectives for which this interdisciplinary approach and its associated infrastructure would provide relevant and original insights that would help fill knowledge gaps about IRES. This article is categorized under: Water and Life > Stresses and Pressures on Ecosystems Science of Water > Hydrological Processes Water and Life > Conservation, Management, and Awareness

Ephemeral key

Biogeochemistry

River ecosystem

Biogeochemical Cycle

10.1002/wat2.1523

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Citations (79)

Assessing the hydrological response from an ensemble of CMIP5 climate projections in the transition zone of the Atlantic region (Bay of Biscay)

Journal of Hydrology (2017)

Maite Meaurio Ane Zabaleta Laurie Boithias Ane Miren Epelde Sabine Sauvage

Baseline (sea)

Peninsula

10.1016/j.jhydrol.2017.02.029

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Citations (62)