Glaser et al. (2026) Assessing Causal Drivers of Diurnal Streamflow Fluctuations Using Convergent Cross Mapping

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Identification

• Journal: Hydrological Processes
• Year: 2026
• Date: 2026-07-01
• Authors: Clarissa Glaser, Philipp Schultze, Heye Bogena, Julian Klaus
• DOI: 10.1002/hyp.70617

Research Groups

• Institute for Water and River Basin Management (iwrbm), RWTH Aachen University
• Department of Hydrology, University of Potsdam

Short Summary

This study applies convergent cross mapping (CCM) to investigate the causal relationships between evapotranspiration, riparian soil moisture, and riparian water viscosity on diurnal streamflow fluctuations in a temperate region. The results reveal that these drivers simultaneously affect streamflow fluctuations with varying effect strengths.

Objective

• Investigate the causal relationships among evapotranspiration, riparian soil moisture, and riparian water viscosity on diurnal streamflow fluctuations using convergent cross mapping (CCM).

Study Configuration

• Spatial Scale: Catchment scale, focusing on the Wüstebach headwater catchment in Germany.
• Temporal Scale: Diurnal to seasonal timescales, comparing dormant and growing seasons.

Methodology and Data

• Models used: Convergent Cross Mapping (CCM)
• Data sources: Field measurements from the Wüstebach headwater catchment

Main Results

• Evapotranspiration, riparian soil moisture, and riparian water viscosity simultaneously affect diurnal streamflow fluctuations with different effect strengths.
• Riparian water viscosity has the strongest effect on streamflow fluctuations, followed by evapotranspiration and then riparian soil moisture.
• The strength of causal effects varies between dormant and growing seasons.

Contributions

• This study provides new insights into the complex ecohydrologic interactions in temperate regions, highlighting the importance of explicitly assessing causality in hydrologic studies.
• The results demonstrate that non-causal relationships among drivers can occur, emphasizing the need for careful analysis of causal relationships.

Funding

• This research was funded by the German Research Foundation (DFG) within the Collaborative Research Centre (SFB 1293) and the European Union's Horizon 2020 research and innovation program under grant agreement No. [insert reference code].

Citation

@article{Glaser2026Assessing,
  author = {Glaser, Clarissa and Schultze, Philipp and Bogena, Heye and Klaus, Julian},
  title = {Assessing Causal Drivers of Diurnal Streamflow Fluctuations Using Convergent Cross Mapping},
  journal = {Hydrological Processes},
  year = {2026},
  doi = {10.1002/hyp.70617},
  url = {https://doi.org/10.1002/hyp.70617}
}