Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2018-57
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Development and technical paper
12 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
ORCHIDEE-ROUTING: A new river routing scheme using a high resolution hydrological database
Trung Nguyen-Quang1, Jan Polcher1, Agnès Ducharne2, Thomas Arsouze1, Xudong Zhou1,3, Ana Schneider2, and Lluís Fita4 1Laboratoire de Météorologie Dynamique, École Polytechnique, 91128 Palaiseau, France
2Sorbonne Université, CNRS, EPHE, Unité Mixte de Recherche METIS, 75005 Paris, France
3State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China
4Centro de Investigaciones del Mar y la Atmósfera, CONICET, UBA, CNRS UMI-IFAECI, C. A. Buenos Aires, Argentina
Abstract. This study presents a revised river routing scheme (RRS) for the Organising Carbon and Hydrology in Dynamic Ecosystems (ORCHIDEE) land surface model. The revision is carried out to benefit from the high resolution topography provided the Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales (HydroSHEDS), processed to a resolution of approximately 1 kilometer. The RRS scheme of the ORCHIDEE uses a unit-to-unit routing concept which allows to preserve as much of the hydrological information of the HydroSHEDS as the user requires. The evaluation focuses on 12 rivers of contrasted size and climate which contribute freshwater to the Mediterranean Sea. First, the numerical aspect of the new RRS is investigated, to identify the practical configuration offering the best trade-off between computational cost and simulation quality for ensuing validations. Second, the performance of the revised scheme is evaluated against observations at both monthly and daily timescales. The new RRS captures satisfactorily the seasonal variability of river discharges, although important biases come from the water budget simulated by the ORCHIDEE model. The results highlight that realistic streamflow simulations require accurate precipitation forcing data and a precise river catchment description over a wide range of scales, as permitted by the new RRS. Detailed analyses at the daily timescale show promising performances of this high resolution RRS for replicating river flow variation at various frequencies. Eventually, this RRS is well adapted for further developments in the ORCHIDEE land surface model to assess anthropogenic impacts on river processes (e.g. damming for irrigation operation).
Citation: Nguyen-Quang, T., Polcher, J., Ducharne, A., Arsouze, T., Zhou, X., Schneider, A., and Fita, L.: ORCHIDEE-ROUTING: A new river routing scheme using a high resolution hydrological database, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-57, in review, 2018.
Trung Nguyen-Quang et al.
Trung Nguyen-Quang et al.
Trung Nguyen-Quang et al.

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This study presents a revised river routing scheme for the Organising Carbon and Hydrology in Dynamic Ecosystems (ORCHIDEE) land surface model. The revision is carried out to benefit from the high resolution topography provided the Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales (HydroSHEDS). We demonstrate that the finer description of the catchments allows to improve the simulated river discharge of ORCHIDEE in a area with complex topography.
This study presents a revised river routing scheme for the Organising Carbon and Hydrology in...
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