Articles | Volume 26, issue 15
https://doi.org/10.5194/hess-26-4169-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-26-4169-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Evaluating downscaling methods of GRACE (Gravity Recovery and Climate Experiment) data: a case study over a fractured crystalline aquifer in southern India
Claire Pascal
CORRESPONDING AUTHOR
Centre d'Étude Spatiale de la BIOsphère, CESBIO-UPS-CNRS-IRD-CNES-INRAE, 18 av. Ed. Belin, Toulouse CEDEX 9, 31401, France
Sylvain Ferrant
Centre d'Étude Spatiale de la BIOsphère, CESBIO-UPS-CNRS-IRD-CNES-INRAE, 18 av. Ed. Belin, Toulouse CEDEX 9, 31401, France
Adrien Selles
Bureau de Recherches Géologiques et Minières (BRGM), Université de Montpellier, 1039 rue de Pinville, Montpellier, 34000, France
Jean-Christophe Maréchal
Bureau de Recherches Géologiques et Minières (BRGM), Université de Montpellier, 1039 rue de Pinville, Montpellier, 34000, France
Abhilash Paswan
National Geophysical Research Institute, CSIR, Hyderabad, India
Olivier Merlin
Centre d'Étude Spatiale de la BIOsphère, CESBIO-UPS-CNRS-IRD-CNES-INRAE, 18 av. Ed. Belin, Toulouse CEDEX 9, 31401, France
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This preprint is open for discussion and under review for Earth Observation (EO).
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Monitoring agricultural drainage flow in irrigated areas is key to water and soil management. In this paper, four simple drainage models are evaluated on two irrigated sub-basins where drainage flow is measured daily. The evaluation of their precision shows that they simulate drainage very well when calibrated with drainage data and that one of them is slightly better. The evaluation of their accuracy shows that only one model can provide rough drainage estimates without calibration data.
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A 6400 m3 on-farm storage basin was built along a wadi in pre-Saharan Morocco to store floodwater for date palm irrigation. Its effect on the water table is confirmed by monitoring surface and groundwater levels and modeling the spatiotemporal variability of the recorded flood-induced piezometric mound. We show that beneficial replenishment of the water table is localized (radius < 360 m) and decreases over time due to the basin siltation reducing its storage capacity and permeability.
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Short summary
This paper presents a new validation method for the downscaling of GRACE (Gravity Recovery and Climate Experiment) data. It measures the improvement of the downscaled data against the low-resolution data in both temporal and, for the first time, spatial domains. This validation method offers a standardized and comprehensive framework to interpret spatially and temporally the quality of the downscaled products, supporting future efforts in GRACE downscaling methods.
This paper presents a new validation method for the downscaling of GRACE (Gravity Recovery and...