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Downscaling a national hydrological model to subgrid scale

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  • S. L. Noorduijn, Geological Survey of Denmark and Greenland
  • ,
  • J. C. Refsgaard, Geological Survey of Denmark and Greenland
  • ,
  • R. J. Petersen
  • A. L. Højberg, Geological Survey of Denmark and Greenland

The resolution of nation scale hydrological models is often considered a limitation with respect to providing useful management information on local scale issues. Use of these coarse scale models to inform both the structure and parameterisation of local scale models could potentially enhance their utility and in some cases provide initial estimates to local scale water resource issues such as nitrate transport. This study explores whether a finer resolution model, whose conceptualization and parameterisation are based upon a nation scale model, can replicate local scale water balance observations and in this way expand the utility of large-scale models. We use the Danish National Water Resources model (DK-model) as a template to model a small 5 km2 subcatchment in Denmark and compare the flows at four transect locations to those observed in a previous field investigation. The resolution of the DK-model is 500 m, and this model was refined to create four additional models of the subcatchment with 100 m, 50 m, 20 m, and 10 m resolutions. Results suggest that none of the refined models could accurately capture the daily overland and groundwater flow conditions. However, for the finer resolution models (10 m and 20 m), the annual overland and groundwater flows agreed well with the observed flows.

TidsskriftJournal of Hydrology
NummerPart A
StatusUdgivet - dec. 2021

Bibliografisk note

Funding Information:
This research was supported by Future Cropping (Innovation Fund Denmark project no. 5107-00002B; https://futurecropping.dk/ ) and T-Rex (GUDP project nr. 34009-18-1453) projects. The field data was collected as part of the TReNDS project (Innovation Fund Denmark project no. 4106-00027B; trends.nitrat.dk), cut-off drain flow data was provided by the iDRAEN project (GUDP project no. 3405-10-0142; https://idraen.dk/ ). We gratefully acknowledge Raphael Schneider and Simon Stisen for the valuable discussions and comments to earlier versions of the manuscript. Thanks to W.J. de Lange and an anonymous reviewer for providing valuable feedback on this work.

Publisher Copyright:
© 2021 Elsevier B.V.

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