Opportunities and challenges in using catchment-scale storage estimates from cosmic ray neutron sensors for rainfall-runoff modelling

Katya Dimitrova-Petrova*, Josie Geris, Mark E. Wilkinson, Rafael Rosolem, Lucile Verrot, Allan Lilly, Chris Soulsby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)
7 Downloads (Pure)


Adequate characterization of catchment storage dynamics is crucial in hydrological models, yet scale-representative storage measurements are rare. Recent developments in Cosmic Ray Neutron Sensor (CRNS) technology and monitoring networks provide a powerful source of more scale-appropriate soil moisture data for many modelling applications. However, the potential in rainfall-runoff modelling is undeveloped. Here we present the first application of CRNS data in conceptual rainfall-runoff modelling and explore this potential in the context of a mixed-agricultural landscape in Scotland. We deployed and calibrated a CRNS in a heterogeneous soil-land use footprint over a ∼3-year period. In this generally wet environment, the CRNS shallow sensing depth and relatively high neutron count uncertainty were identified as major challenges. However, given the better spatial coverage (up to 14 ha) and ease for maintenance, CRNS was thought to represent the simplest approach for long-term monitoring of managed mixed-agricultural sites. We used CRNS-derived, as well as single point-scale estimates, of near-surface soil storage (SNS) to explore their characterisation of storage dynamics at the catchment-scale. Inter-comparison using linear regression showed that SNS related well to catchment-scale storage dynamics, however this relationship was stronger for CRNS (R2=0.91) compared to point-scale derived estimates (R2=0.76). Based on this, we evaluated the effect of using the CRNS and point scale derived SNS data to constrain storage estimates controlling runoff generation in a common rainfall-runoff model (HBV-light). Including CRNS or point-scale field SNS data alone in model calibration was especially useful for intermediate and wet periods. A combined model calibration using discharge and either SNS storage estimates provided a better representation of catchment internal dynamics, additionally reducing uncertainty during low flows. In the context of mixed-agricultural landscapes in humid environments, this study showed the potential of using CRNS over point scale data (in terms of representativeness for single point data and practicality for point sensor networks) to characterise the catchment storage-discharge relationship and inform hydrological modelling.
Original languageEnglish
Article number124878
Number of pages15
JournalJournal of Hydrology
Early online date24 Mar 2020
Publication statusPublished - Jul 2020

Bibliographical note


We thank the Macaulay Development Trust and School of Geosciences, University of Aberdeen for KDPs scholarship. JG would like to acknowledge funding from the Royal Society and the Carnegie Trust for the Universities of Scotland (project 70112). JG and LV acknowledge funding from the UK Natural Environment Research Council (project NE/N007611/1 and CC13_080). MW was supported by the Rural & Environment Science & Analytical Services Division of the Scottish Government. RR received funding from the Natural Environment Research Council (projects NE/M003086/1, NE/R004897/1 and NE/T005645/1) and from the International Atomic Energy Agency of the United Nations (IAEA/UN) (project CRP D12014). Special thanks to Carol Taylor, Jessica Fennell, Alice Poli and many more for assistance with fieldwork. Finally, we would like to acknowledge Kenneth Loades for providing us with essential equipment for soil sampling and thank David Finlay and his team for enabling land access in Elsick.


  • Cosmic ray neutron sensor
  • rainfall-runoff modelling
  • storage-discharge relationship
  • managed landscapes
  • catchment hydrology
  • Storage-discharge relationship
  • Managed landscapes
  • Catchment hydrology
  • Rainfall-runoff modelling


Dive into the research topics of 'Opportunities and challenges in using catchment-scale storage estimates from cosmic ray neutron sensors for rainfall-runoff modelling'. Together they form a unique fingerprint.

Cite this