Tramblay et al. (2020) Trends in flow intermittence for European rivers

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Identification

• Journal: Hydrological Sciences Journal
• Year: 2020
• Authors: Yves Tramblay, Agnieszka Rutkowska, Éric Sauquet, Catherine Sefton, Gregor Laaha, Marzena Osuch, Teresa Albuquerque, Maria Helena Alves, Kazimierz Banasik, Aurélien Beaufort, Luca Brocca, Stefania Camici, Zoltán Csabai, Hamouda Dakhlaoui, Anna Maria De Girolamo, Gerald Dörflinger, Francesc Gallart, Tobias Gauster, Lahoucine Hanich, Silvia Kohnová, Luis Mediero, Plamen Ninov, Simon Parry, Pere Quintana Seguí, Ourania Tzoraki, Thibault Datry
• DOI: 10.1080/02626667.2020.1849708

Research Groups

Not specified in the provided text, likely a collaboration of European hydrological and climatological institutions.

Short Summary

Analysis of 452 European intermittent rivers (1970–2010) reveals a widespread trend of increasing and earlier zero-flow days, strongly correlated with long-term drought conditions (SPEI 12–24 months), suggesting increased water stress across the continent, particularly in Southern Europe.

Objective

• To analyze the temporal evolution and trends (1970–2010) in flow intermittence, including the annual and seasonal number of zero-flow days, maximum duration of dry spells, and the mean date of zero-flow events, across 452 European rivers.
• To investigate the relationships between river flow intermittence and climate variability using the Standardized Precipitation Evapotranspiration Index (SPEI) and indices describing large-scale atmospheric circulation.

Study Configuration

• Spatial Scale: 452 intermittent rivers across Europe.
• Temporal Scale: 41 years (1970 to 2010).

Methodology and Data

• Models used: Trend analysis (for annual/seasonal zero-flow days, dry spell duration, and mean date of zero-flow events); Correlation analysis.
• Data sources: Database of flow records for 452 intermittent rivers; Standardized Precipitation Evapotranspiration Index (SPEI); large-scale atmospheric circulation indices.

Main Results

• Flow intermittence patterns exhibit strong spatial variability, indicating significant control by local catchment properties.
• Most detected trends show an increasing number of zero-flow days annually and seasonally across the study area.
• Zero-flow events tend to occur earlier in the year, a trend particularly pronounced in Southern Europe.
• The SPEI is strongly related to the annual and seasonal zero-flow day occurrence in more than 50% of the stations, with the strongest relationships found for accumulation times between 12 months and 24 months.
• River intermittence shows a weaker dependence on large-scale atmospheric circulation indices compared to the SPEI.

Contributions

• Provides a comprehensive, large-scale assessment (452 rivers over 41 years) of the temporal evolution of flow intermittence across Europe, establishing a baseline for future hydrological studies.
• Quantifies the strong influence of long-term water balance deficits (represented by SPEI 12–24 months) on the increasing frequency of zero-flow events.
• Highlights the increasing water stress in European intermittent rivers, providing crucial evidence for policymakers regarding potential impacts on aquatic biota, biochemistry, and regional water resource availability.

Funding

Not specified in the provided text.

Citation

@article{Tramblay2020Trends,
  author = {Tramblay, Yves and Rutkowska, Agnieszka and Sauquet, Éric and Sefton, Catherine and Laaha, Gregor and Osuch, Marzena and Albuquerque, Teresa and Alves, Maria Helena and Banasik, Kazimierz and Beaufort, Aurélien and Brocca, Luca and Camici, Stefania and Csabai, Zoltán and Dakhlaoui, Hamouda and Girolamo, Anna Maria De and Dörflinger, Gerald and Gallart, Francesc and Gauster, Tobias and Hanich, Lahoucine and Kohnová, Silvia and Mediero, Luis and Ninov, Plamen and Parry, Simon and Quintana‐Seguí, Pere and Tzoraki, Ourania and Datry, Thibault},
  title = {Trends in flow intermittence for European rivers},
  journal = {Hydrological Sciences Journal},
  year = {2020},
  doi = {10.1080/02626667.2020.1849708},
  url = {https://doi.org/10.1080/02626667.2020.1849708}
}

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