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On the Use of Satellite Remote Sensing to Detect Floods and Droughts at Large Scales

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Article highlights

  • Each component of the terrestrial water storage is a key hydrological variable to understand floods and drought events

  • Their monitoring at river basin scale and over long periods of time is facilitated by large scale sensors.

  • The combination of Earth observations with other datasets can be an asset for the prediction of hydrological events and for monitoring.

Abstract

Hydrological extremes, in particular floods and droughts, impact all regions across planet Earth. They are mainly controlled by the temporal evolution of key hydrological variables like precipitation, evaporation, soil moisture, groundwater storage, surface water storage and discharge. Precise knowledge of the spatial and temporal evolution of these variables at the scale of river basins is essential to better understand and forecast floods and droughts. In this article, we present recent advances on the capability of Earth observation (EO) satellites to provide global monitoring of floods and droughts. The local scale monitoring of these events which is traditionally done using high-resolution optical or SAR (synthetic aperture radar) EO and in situ data will not be addressed. We discuss the applications of moderate- to low-spatial-resolution space-based observations, e.g., satellite gravimetry (GRACE and GRACE-FO), passive microwaves (i.e. SMOS) and satellite altimetry (i.e. the JASON series and the Copernicus Sentinel missions), with supporting examples. We examine the benefits and drawbacks of integrating these EO datasets to better monitor and understand the processes at work and eventually to help in early warning and management of flood and drought events. Their main advantage is their large monitoring scale that provides a “big picture” or synoptic view of the event that cannot be achieved with often sparse in situ measurements. Finally, we present upcoming and future EO missions related to this topic including the SWOT mission.

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Acknowledgements

This paper arose from the international workshop on “Natural and man-made hazards monitoring by the Earth Observation missions: current status and scientific gaps” held at the International Space Science Institute (ISSI), Bern, Switzerland, on April 15–18, 2019. The authors wish to thank the two anonymous reviewers for their constructive suggestions which significantly improved this article; Dr. Anny Cazenave, for her invitation to prepare this paper and Anne-Marie Cousin for her help in producing Fig. 1.

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Correspondence to T. Lopez.

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Lopez, T., Al Bitar, A., Biancamaria, S. et al. On the Use of Satellite Remote Sensing to Detect Floods and Droughts at Large Scales. Surv Geophys 41, 1461–1487 (2020). https://doi.org/10.1007/s10712-020-09618-0

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  • DOI: https://doi.org/10.1007/s10712-020-09618-0

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