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| Titel |
Combining high-resolution satellite images and altimetry to estimate the volume of small lakes |
| VerfasserIn |
F. Baup, F. Frappart, J. Maubant |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 5 ; Nr. 18, no. 5 (2014-05-27), S.2007-2020 |
| Datensatznummer |
250120371
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| Publikation (Nr.) |
 copernicus.org/hess-18-2007-2014.pdf |
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| Zusammenfassung |
| This study presents an
approach to determining the volume of water in small lakes (<100 ha) by
combining satellite altimetry data and high-resolution (HR) images. In spite
of the strong interest in monitoring surface water resources on a small scale
using radar altimetry and satellite imagery, no information is available
about the limits of the remote-sensing technologies for small lakes mainly
used for irrigation purposes. The lake being studied is located in the
south-west of France and is only used for agricultural irrigation purposes.
The altimetry satellite data are provided by an RA-2 sensor onboard Envisat,
and the high-resolution images (<10 m) are obtained from optical
(Formosat-2) and synthetic aperture radar (SAR) antenna (Terrasar-X and
Radarsat-2) satellites. The altimetry data (data are obtained every 35 days)
and the HR images (77) have been available since 2003 and 2010, respectively.
In situ data (for the water levels and volumes) going back to 2003 have been
provided by the manager of the lake. Three independent approaches are
developed to estimate the lake volume and its temporal variability. The first
two approaches (HRBV and ABV) are empirical and use synchronous ground
measurements of the water volume and the satellite data. The results
demonstrate that altimetry and imagery can be effectively and accurately used
to monitor the temporal variations of the lake (R2ABV = 0.98,
RMSEABV = 5%, R2HRBV = 0.90, and
RMSEABV = 7.4%), assuming a time-varying triangular shape
for the shore slope of the lake (this form is well adapted since it implies a
difference inferior to 2% between the theoretical volume of the lake and
the one estimated from bathymetry). The third method (AHRBVC) combines
altimetry (to measure the lake level) and satellite images (of the lake
surface) to estimate the volume changes of the lake and produces the best
results (R2AHRBVC = 0.98) of the three methods, demonstrating
the potential of future Sentinel and SWOT missions to monitor small lakes and
reservoirs for agricultural and irrigation applications. |
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