Hydrological Applications of Satellite AltimetryRivers, Lakes, Man-Made Reservoirs, Inundated Areas

Crétaux, Jean-François; Nielsen, Karina; Frappart, Frédéric; Papa, Fabrice; Calmant, Stéphane; Benvéniste, Jérôme

doi:10.1201/9781315151779-14

Cited by 43 publications

(56 citation statements)

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“…The spatial variations of the lake surface topography also have geodetic implications for the Earth's gravimetric geoid. Satellite altimetry has been increasingly used to monitor inland water bodies over the past decades (Crétaux et al, 2017). The water levels in lakes and rivers have been observed successfully from different radar altimeter (RA) missions (e.g., Berry et al, 2005;Birkett, 1995;Frappart et al, 2006;Jiang et al, 2017;Kleinherenbrink et al, 2015;Nielsen et al, 2015;Tseng et al, 2013), making it possible to study continental surface hydrology at global scale.…”

Section: Introductionmentioning

confidence: 99%

Lake Level and Surface Topography Measured With Spaceborne GNSS‐Reflectometry From CYGNSS Mission: Example for the Lake Qinghai

Cardellach

Fabra

et al. 2018

Geophysical Research Letters

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This paper demonstrates inland water altimetry of spaceborne Global Navigation Satellite System‐Reflectometry (GNSS‐R) using the Cyclone GNSS (CYGNSS) mission data. From 12 tracks of raw data overpassing the Lake Qinghai, the bistatic group delay and carrier phase delay are extracted from the quasi‐specular GNSS reflections. The water levels derived from the group delay observations are consistent with the Cryosat‐2 and in situ gauge measurements. The surface topography profiles from the phase delay measurements show good self‐consistence along the coincident tracks. Decimeter‐level surface height anomalies are resolved with the phase delay measurements, which can be associated with the accuracy degradation of the geoid model in this region. Systematic errors remain in both group delay and phase delay altimetry measurements, which are attributed to the receiver orbit errors and ionospheric correction residuals. These limitations can be eliminated in further GNSS‐R missions dedicated to altimetry applications.

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Section: Introductionmentioning

confidence: 99%

Lake Level and Surface Topography Measured With Spaceborne GNSS‐Reflectometry From CYGNSS Mission: Example for the Lake Qinghai

Cardellach

Fabra

et al. 2018

Geophysical Research Letters

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“…Satellite altimetry now routinely measures water level on land from which river discharge can be derived, in particular over ungauged or poorly gauged hydrological basins (Crétaux et al, 2018). River discharge for medium size basins (<10,000 km 2 ) is also indirectly estimated from satellite images in the visible and near infrared spectrum (e.g., MODerate-resolution Imaging Spectroradiometer -MODIS) (Tarpanelli et al, 2015).…”

Section: River Runoffmentioning

confidence: 99%

Requirements for a Coastal Hazards Observing System

et al. 2019

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Coastal zones are highly dynamical systems affected by a variety of natural and anthropogenic forcing factors that include sea level rise, extreme events, local oceanic and atmospheric processes, ground subsidence, etc. However, so far, they remain poorly monitored on a global scale. To better understand changes affecting world coastal zones and to provide crucial information to decision-makers involved in adaptation to and mitigation of environmental risks, coastal observations of various types need to be collected and analyzed. In this white paper, we first discuss the main forcing agents acting on coastal regions (e.g., sea level, winds, waves and currents, river runoff, sediment supply and transport, vertical land motions, land use) and the induced coastal response (e.g., shoreline position, estuaries morphology, land topography at Frontiers in Marine Science | www.frontiersin.org 1 July 2019 | Volume 6 | Article 348Benveniste et al.Requirements for a Coastal Zone Observing System the land-sea interface and coastal bathymetry). We identify a number of space-based observational needs that have to be addressed in the near future to understand coastal zone evolution. Among these, improved monitoring of coastal sea level by satellite altimetry techniques is recognized as high priority. Classical altimeter data in the coastal zone are adversely affected by land contamination with degraded range and geophysical corrections. However, recent progress in coastal altimetry data processing and multisensor data synergy, offers new perspective to measure sea level change very close to the coast. This issue is discussed in much detail in this paper, including the development of a global coastal sea-level and sea state climate record with mission consistent coastal processing and products dedicated to coastal regimes. Finally, we present a new promising technology based on the use of Signals of Opportunity (SoOp), i.e., communication satellite transmissions that are reutilized as illumination sources in a bistatic radar configuration, for measuring coastal sea level. Since SoOp technology requires only receiver technology to be placed in orbit, small satellite platforms could be used, enabling a constellation to achieve high spatio-temporal resolutions of sea level in coastal zones.

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“…Data from 10 gauge stations were found in close vicinity to altimetry virtual stations (VSs; at a distance of less than 20 km along the streams). Virtual stations are built at intersections between an orbit ground rack and a water body (lake, river and floodplain) (Crétaux et al, 2017). Besides, surface water storage variations were compared to the river flow entering the delta, summing the records from three gauge stations located in upstream part of the delta.…”

Section: In Situ Water Levels and Dischargesmentioning

confidence: 99%

“…The radar emits an electromagnetic (EM) wave towards the surface and measures the round-trip time ( t) of the EM wave. Taking into account propagation corrections caused by delays due to the interactions of electromagnetic waves in the atmosphere, and geophysical corrections, the height of the reflecting surface (h) with reference to an ellipsoid can be estimated as follows (Crétaux et al, 2017):…”

Section: Satellite-derived Water Level Time Series In the Mackenzie Dmentioning

confidence: 99%

“…If space missions of radar altimetry were mainly dedicated to estimate ocean surface topography (Fu and Cazenave, 2001), it is now commonly used for monitoring inland water levels (Birkett, 1995;Cazenave et al, 1997;Frappart et al, 2006aFrappart et al, , 2015bSantos da Silva et al, 2010;Crétaux et al, 2011aCrétaux et al, , 2017. Several studies have shown the possibility to measure water levels variations in lakes, rivers and flooding plains (Frappart et al, 2006b(Frappart et al, , 2015aSantos da Silva et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Quantification of surface water volume changes in the Mackenzie Delta using satellite multi-mission data

Normandin

Frappart

Lubac

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Quantification of surface water storage in extensive floodplains and their dynamics are crucial for a better understanding of global hydrological and biogeochemical cycles. In this study, we present estimates of both surface water extent and storage combining multi-mission remotely sensed observations and their temporal evolution over more than 15 years in the Mackenzie Delta. The Mackenzie Delta is located in the northwest of Canada and is the second largest delta in the Arctic Ocean. The delta is frozen from October to May and the recurrent ice break-up provokes an increase in the river's flows. Thus, this phenomenon causes intensive floods along the delta every year, with dramatic environmental impacts. In this study, the dynamics of surface water extent and volume are analysed from 2000 to 2015 by combining multi-satellite information from MODIS multispectral images at 500 m spatial resolution and river stages derived from ERS-2 (1995ERS-2 ( -2003, ENVISAT (2002ENVISAT ( -2010 and SARAL (since 2013) altimetry data. The surface water extent (permanent water and flooded area) peaked in June with an area of 9600 km 2 (±200 km 2 ) on average, representing approximately 70 % of the delta's total surface. Altimetrybased water levels exhibit annual amplitudes ranging from 4 m in the downstream part to more than 10 m in the upstream part of the Mackenzie Delta. A high overall correlation between the satellite-derived and in situ water heights (R > 0.84) is found for the three altimetry missions. Finally, using altimetry-based water levels and MODIS-derived surface water extents, maps of interpolated water heights over the surface water extents are produced. Results indicate a high variability of the water height magnitude that can reach 10 m compared to the lowest water height in the upstream part of the delta during the flood peak in June. Furthermore, the total surface water volume is estimated and shows an annual variation of approximately 8.5 km 3 during the whole study period, with a maximum of 14.4 km 3 observed in 2006. The good agreement between the total surface water volume retrievals and in situ river discharges (R = 0.66) allows for validation of this innovative multi-mission approach and highlights the high potential to study the surface water extent dynamics.

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Hydrological Applications of Satellite AltimetryRivers, Lakes, Man-Made Reservoirs, Inundated Areas

Cited by 43 publications

References 1 publication

Lake Level and Surface Topography Measured With Spaceborne GNSS‐Reflectometry From CYGNSS Mission: Example for the Lake Qinghai

Lake Level and Surface Topography Measured With Spaceborne GNSS‐Reflectometry From CYGNSS Mission: Example for the Lake Qinghai

Requirements for a Coastal Hazards Observing System

Quantification of surface water volume changes in the Mackenzie Delta using satellite multi-mission data

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