Articles | Volume 26, issue 1
Hydrol. Earth Syst. Sci., 26, 1–16, 2022
https://doi.org/10.5194/hess-26-1-2022

Special issue: Frontiers in the application of Bayesian approaches in water...

Hydrol. Earth Syst. Sci., 26, 1–16, 2022
https://doi.org/10.5194/hess-26-1-2022
Research article
03 Jan 2022
Research article | 03 Jan 2022

Synthesizing the impacts of baseflow contribution on concentration–discharge (CQ) relationships across Australia using a Bayesian hierarchical model

Danlu Guo et al.

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Cited articles

Ator, S. W., Brakebill, J. W., and Blomquist, J. D.: Sources, fate, and transport of nitrogen and phosphorus in the Chesapeake Bay watershed: An empirical model, Vol. 5167, US Department of the Interior, US Geological Survey, Baltimore, MD 21228, 2011. 
Beck, H. E., van Dijk, A. I. J. M., Miralles, D. G., de Jeu, R. A. M., Bruijnzeel, L. A., McVicar, T. R., and Schellekens, J.: Global patterns in base flow index and recession based on streamflow observations from 3394 catchments, Water Resour. Res., 49, 7843–7863, https://doi.org/10.1002/2013WR013918, 2013. 
Bende-Michl, U., Verburg, K., and Cresswell, H. P.: High-frequency nutrient monitoring to infer seasonal patterns in catchment source availability, mobilisation and delivery, Environ. Monit. Assess., 185, 9191–9219, https://doi.org/10.1007/s10661-013-3246-8, 2013. 
Cartwright, I.: Concentration vs. streamflow (C-Q) relationships of major ions in south-eastern Australian rivers: Sources and fluxes of inorganic ions and nutrients, Appl. Geochem., 120, 104680, https://doi.org/10.1016/j.apgeochem.2020.104680, 2020. 
Dupas, R., Abbott, B. W., Minaudo, C., and Fovet, O.: Distribution of Landscape Units Within Catchments Influences Nutrient Export Dynamics, Front. Environ. Sci., 7, p. 43, https://doi.org/10.3389/fenvs.2019.00043, 2019. 
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Short summary
We investigate the impact of baseflow contribution on concentration–flow (CQ) relationships across the Australian continent. We developed a novel Bayesian hierarchical model for six water quality variables across 157 catchments that span five climate zones. For sediments and nutrients, the CQ slope is generally steeper for catchments with a higher median and a greater variability of baseflow contribution, highlighting the key role of variable flow pathways in particulate and solute export.