Preprints
https://doi.org/10.5194/hess-2021-168
https://doi.org/10.5194/hess-2021-168

  21 Apr 2021

21 Apr 2021

Review status: this preprint is currently under review for the journal HESS.

Robustness of a parsimonious subsurface drainage model at the French national scale

Alexis Jeantet1, Hocine Henine1, Cédric Chaumont1, Lila Collet1,a, Guillaume Thirel1, and Julien Tournebize1 Alexis Jeantet et al.
  • 1INRAE, University of Paris Saclay, UR HYCAR, Centre Jouy en Josas-Antony, 1 rue Pierre Gilles de Gennes, Antony, France
  • anow at: EDF R&D, OSIRIS Department, 7 boulevard Gaspard Monge, 91120 Palaiseau, France

Abstract. Drainage systems are currently implemented on agricultural plots subjected to temporary or permanent waterlogging issues. Drained plots account for 9 % of all arable soils in France. As such, the need for accurate hydrological modeling is crucial, especially in an unstable future context affected by climate change. The aim of this paper is to assess the capacity of the SIDRA-RU hydrological drainage model in representing the variability of pedoclimatic conditions within French metropolitan areas, as well as to demonstrate the utility of this model as a long-term management tool. The model is initially calibrated using the KGE' criterion as an Objective Function (OF) on a large and unique database encompassing 22 plots spread across France and classified according to three main soil textures (silty, silty-clayey and clayey). The performance of SIDRA-RU is evaluated by monitoring the KGE' calibration values, as well as the quality of the simulations of both high and low discharges and the annual drained water balance on each plot. Next, the temporal robustness of the model is assessed by conducting the split-sample test on the selected plots that satisfy the data requirements. Results show that the SIDRA-RU model accurately simulates the drainage discharge, especially on silty soils. The performance on clayey soils is slightly weaker than that on silty soils yet remains acceptable. Similarly, the split-sample test indicates that SIDRA-RU is temporally robust on all three soil textures. Consequently, the SIDRA-RU model closely represents the diversity of French drained soil and could be used for its long-term management.

Alexis Jeantet et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-168', Nicholas Jarvis, 16 May 2021
  • RC2: 'Comment on hess-2021-168', Anonymous Referee #2, 18 May 2021

Alexis Jeantet et al.

Alexis Jeantet et al.

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Short summary
The hydrological subsurface drainage model SIDRA-RU is assessed at the French national scale using a unique database representing the large majority of the French drained areas. The model is evaluated following its capacity to simulate the drainage discharge variability and the annual drained water balance. Eventually, the temporal robustness of SIDRA-RU is assessed to demonstrate the utility of this model as a long-term management tool.