Articles | Volume 25, issue 12
Hydrol. Earth Syst. Sci., 25, 6437–6463, 2021
https://doi.org/10.5194/hess-25-6437-2021
Hydrol. Earth Syst. Sci., 25, 6437–6463, 2021
https://doi.org/10.5194/hess-25-6437-2021

Research article 20 Dec 2021

Research article | 20 Dec 2021

Bending of the concentration discharge relationship can inform about in-stream nitrate removal

Joni Dehaspe et al.

Data sets

DEM over Europe from the GMES RDA project (EU-DEM, resolution 25 m) - version 1, October 2013 EEA - European Environmental Agency https://sdi.eea.europa.eu/data/66fa7dca-8772-4a5d-9d56-2caba4ecd36a

Model code and software

R codes for a stream network model and a C-Q bending metric J. Dehaspe https://doi.org/10.4211/hs.da70a09dc6074242ada756c29d12dcb3

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Short summary
Increased nitrate concentrations in surface waters can compromise river ecosystem health. As riverine nitrate uptake is hard to measure, we explore how low-frequency nitrate concentration and discharge observations (that are widely available) can help to identify (in)efficient uptake in river networks. We find that channel geometry and water velocity rather than the biological uptake capacity dominate the nitrate-discharge pattern at the outlet. The former can be used to predict uptake.