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Article Dans Une Revue Tecnología y ciencias del agua Année : 2021

Rainfall-runoff modelling in dryland catchments, Sauce Grande, Argentina

Modelación precipitación-escorrentía en cuencas de zonas secas, Sauce Grande, Argentina

Résumé

The poor understanding on the hydrological functioning of many dryland catchments challenges hydrological modelling on both a discrete and a continuous basis. This paper implements a simple yet robust conceptual rainfall-runoff model, GR2M, to predict long-term monthly runoff in the Sauce Grande catchment (Argentina). It aims at determining whether (i) simple rainfall-runoff models perform satisfactory on dryland catchments, and (ii) the parameter transfer from calibration to validation works in the context of climate-driven flow variability. Two model versions are evaluated and compared considering similar and contrasting catchment cnditions along the period of record. Calibration results showed from 88% to 90% efficiency on runoff predictions (on average), with variations along calibration periods linked to prevailing flow conditions (magnitude, variability and constancy). From both, the model version separating the part of direct runoff from subsurface flow showed greater sensitivity to extreme flow conditions and greater structure adaptability to the full range of flows. Efficiency losses from calibration to validation were yet marked (22%, on average), and responded primarily to runoff overestimations on periods of low flow. Parameters were allowed to evolve over time along with hydroclimatic conditions based on decision tree learning. Through this modification, the predictive efficiency of GR2M improved by 97%. In addition to validating the robustness of simple rainfall-runoff models on drylands once parameters may evolve over time, this paper yields new hydrological data that constitutes an important platform to underpin further water resources planning and management in this highly regulated catchment.

Domaines

Hydrologie
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Dates et versions

hal-04010508 , version 1 (01-03-2023)

Licence

Paternité - Pas d'utilisation commerciale - Partage selon les Conditions Initiales

Identifiants

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Ana Casado. Rainfall-runoff modelling in dryland catchments, Sauce Grande, Argentina. Tecnología y ciencias del agua, 2021, 12 (5), pp.254-303. ⟨10.24850/j-tyca-2021-05-06⟩. ⟨hal-04010508⟩
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