Evaluation of parameterisation approaches for estimating soil hydraulic parameters with HYDRUS-1D in the groundnut basin of Senegal

Diongue Djim M.L., Roupsard Olivier, Do Frédéric C., Stumpp Christine, Orange Didier, Sow Sidy, Jourdan Christophe, Faye Serigne. 2022. Evaluation of parameterisation approaches for estimating soil hydraulic parameters with HYDRUS-1D in the groundnut basin of Senegal. Hydrological Sciences Journal, 67 (15) : 2327-2342.

Résumé : Soil hydraulic parameters (SHPs) required as inputs for numerical models are scarce in Sahelian regions. Instead, they are estimated using pedotransfer functions (PTFs), but their ability to simulate soil water dynamics has not been evaluated. This study aims to parameterize SHPs with seven different PTFs and inverse modelling to examine their ability to simulate water fluxes in Senegal's Groundnut basin. We used four years of field measurements of soil water content (SWC) and actual evapotranspiration (ETa) under pearl millet and groundnut crop rotation for model evaluation. Inverse modelling for SWC (root mean square error [RMSE] ≤ 0.015 cm3 cm−3) and ETa (RMSE ≤ 0.62 mm d−1) yielded the best model performance compared to PTFs (0.024–0.175 cm3 cm−3 and 0.68–0.96 mm d−1, respectively). Where field measurements are lacking for inverse estimation, three of the seven tested PTFs yielded good modelling results and could be used as a parsimonious approach for cultivated Sahelian soils.

Mots-clés Agrovoc : hydrologie, propriété hydraulique du sol, teneur en eau du sol, évapotranspiration, hydrologie des sols

Mots-clés géographiques Agrovoc : Sénégal

Mots-clés libres : Soil hydraulic parameters, Soil moisture, Evapotranspiration, HYDRUS-1D, Loamy sand soil, Sahelian cropping system

Classification Agris : P10 - Ressources en eau et leur gestion

Champ stratégique Cirad : CTS 5 (2019-) - Territoires

Agences de financement européennes : European Commission

Agences de financement hors UE : Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Agropolis Fondation, Total Foundation, Consortium of International Agricultural Research Centers

Programme de financement européen : H2020

Projets sur financement : (EU) RAMSES, (EU) Sequestration and Green-house Gas Emissions in (Agro) Sylvopastoral Ecosystems in the Sahelian CILSS States

Auteurs et affiliations

• Diongue Djim M.L., UCAD (SEN)
• Roupsard Olivier, CIRAD-PERSYST-UMR Eco&Sols (SEN)
• Do Frédéric C., IRD (FRA)
• Stumpp Christine, BOKU (AUT)
• Orange Didier, IRD (FRA)
• Sow Sidy, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Jourdan Christophe, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0001-9857-3269
• Faye Serigne, UCAD (SEN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603671/)

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