An evapotranspiration model driven by remote sensing data for assessing groundwater resource in karst watershed

Ollivier, Chloé; Olioso, Albert; Carrière, Simon Damien; Boulet, Gilles; Chalikakis, Konstantinos; Chanzy, André; Charlier, Jean‐Baptiste; Combemale, David; Davi, Hendrik; Emblanch, Christophe; Marloie, Olivier; Martin‐StPaul, Nicolas; Mazzilli, Naomi; Simioni, Guillaume; Weiss, Marie

doi:10.1016/j.scitotenv.2021.146706

Cited by 18 publications

(8 citation statements)

References 98 publications

(158 reference statements)

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“…We studied the June–September 2020 period in detail as it is a period of increased ET and low rainfall. Under these favorable conditions, we were able to relate a) mass changes measured by gravimeters minus water discharge (Q) measured at the karst system outlet to b) ET modeled using the SimpKcET model (Ollivier et al., 2021).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The SimpKcET model was developed by Ollivier et al. (2021) to quantify ET over large karst areas. It was coupled to the KaRaMel model, which simulates water flow within karst systems (Ollivier et al., 2020), to improve the simulation of karst aquifer processes.…”

Section: Methodsmentioning

confidence: 99%

“…Meteorological inputs, such as precipitation and reference ET, were obtained from SAFRAN reanalysis at a spatial resolution of 8 km (Vidal et al., 2010). SimpKcET was favorably evaluated over three (3) flux towers on two (2) typical Mediterranean forested fields and one crop field in southeastern France (Ollivier et al., 2021).…”

Section: Methodsmentioning

confidence: 99%

“…(b) We consider local hydrological effects by using measured discharges at the outlet of the karst hydrosystem (Fontaine‐de‐Vaucluse spring). (c) We explore the direct link between the gravity signal and the daily ET dynamic calculated with the SimpKcET model validated on three (3) flux towers near the site (Ollivier et al., 2021). For the first time, these conditions make it possible to relate gravity directly to ET signals at the daily time step.…”

Section: Introductionmentioning

confidence: 99%

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First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

Carrière

Loiseau

Champollion

et al. 2021

Geophysical Research Letters

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Evapotranspiration (ET) is a key variable to understanding eco-hydrosystems because it links water, carbon, and energy cycles (Fisher, 2014). ET is a major component of the water cycle, accounting for approximately 70% of precipitated water at the continental scale (Fisher et al., 2017;Oki & Kanae, 2006). Several approaches exist for estimating ET, but large uncertainties persist and estimates remain difficult to validate, particularly at large scale (Müller & Bolte, 2009;Verstraeten et al., 2008). New approaches for estimating ET are crucially needed to improve our understanding of related processes.Gravimetry is a geophysical method that measures the gravitational acceleration field (g). During the last decades, progress has led to the development of devices that can now achieve precision of a few nm/s 2 and obtain highly accurate temporal monitoring (Van Camp et al., 2006). These advances now allow to study the dynamics of ET. Data from the GRACE (Gravity Recovery and Climate Experiment) satellite have been used to study ET (Long

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Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

Carrière

Loiseau

Champollion

et al. 2021

Geophysical Research Letters

Self Cite

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“…interception and evapotranspiration, mainly results from the spatial variability of soil properties. Moreover, Ollivier et al (2021) underline that this sensitivity is further related to often missing information about spatially distributed and vegetation-dependent evapotranspiration dynamics. In cases where snowmelt represents a controlling factor in the water balance of karst areas, Doummar et al (2018) showed that groundwater recharge estimations are most sensitive to temperature variations.…”

Section: Introductionmentioning

confidence: 97%

Unraveling the time-dependent relevance of input model uncertainties for a lumped hydrologic model of a pre-alpine karst system

2021

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Uncertainties in hydrologic model outputs can arise for many reasons such as structural, parametric and input uncertainty. Identification of the sources of uncertainties and the quantification of their impacts on model results are important to appropriately reproduce hydrodynamic processes in karst aquifers and to support decision-making. The present study investigates the time-dependent relevance of model input uncertainties, defined as the conceptual uncertainties affecting the representation and parameterization of processes relevant for groundwater recharge, i.e. interception, evapotranspiration and snow dynamic, on the lumped karst model LuKARS. A total of nine different models are applied, three to compute interception (DVWK, Gash and Liu), three to compute evapotranspiration (Thornthwaite, Hamon and Oudin) and three to compute snow processes (Martinec, Girons Lopez and Magnusson). All the input model combinations are tested for the case study of the Kerschbaum spring in Austria. The model parameters are kept constant for all combinations. While parametric uncertainties computed for the same model in previous studies do not show pronounced temporal variations, the results of the present work show that input uncertainties are seasonally varying. Moreover, the input uncertainties of evapotranspiration and snowmelt are higher than the interception uncertainties. The results show that the importance of a specific process for groundwater recharge can be estimated from the respective input uncertainties. These findings have practical implications as they can guide researchers to obtain relevant field data to improve the representation of different processes in lumped parameter models and to support model calibration.

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Advances in Karst Geomorphology and Hydrogeology Research in the Last Decade and Its Future Direction for Karst Land Use Planning

Haryono

2023

Advances in Geographical and Environmental Sciences

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An evapotranspiration model driven by remote sensing data for assessing groundwater resource in karst watershed

Cited by 18 publications

References 98 publications

First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

Unraveling the time-dependent relevance of input model uncertainties for a lumped hydrologic model of a pre-alpine karst system

Advances in Karst Geomorphology and Hydrogeology Research in the Last Decade and Its Future Direction for Karst Land Use Planning

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