Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
<p>The comprehension of water level fluctuations and the sustainability of the Inner Niger River Delta (IND) is a major concern for the scientific community, but also for the local population. Located in the centre of Mali, the heart of the Sahel, the delta is characterised by a floodable area...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/c8e14479d0504006ab985c1286fbe526 |
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| Sumario: | <p>The comprehension of water level fluctuations and the
sustainability of the Inner Niger River Delta (IND) is a major concern for
the scientific community, but also for the local population. Located in the
centre of Mali, the heart of the Sahel, the delta is characterised by a
floodable area of more than 32 000 km<span class="inline-formula"><sup>2</sup></span> during the rainy season, which
contributes very strongly to the vitality of local ecosystem, and is
consequently classified as a Ramsar site under the international Convention
for Wetlands. In addition, the Delta acts as an environmental and
socio-economic development barometer for the entire sub-region. Nowadays, we
can observe an increasing fragility of the delta due to climate change,
desertification and human activities, and justifies the need for permanent
monitoring. The present study is based on the recent successes of radar
altimetry, originally designed to monitor the dynamics topography of the
ocean, and now very frequently used to retrieve inland water levels, of
lakes, rivers, and wetlands. Previous studies evaluated the performances of
several radar altimetry missions including Low Resolution Mode (LRM)
(Topex-Poseidon, Jason-1/2/3, ERS-2, ENVISAT, and SARAL, and Synthetic
Aperture Radar (SAR) Sentinel-3A missions for water level retrievals over
1992–2017. More than 50 times series of water levels were build at the
crossing between water bodies and Sentinel-3A and 3B over 2016–2020.
Twenty-four comparisons between in-situ and altimetry-based time-series of
water levels were achieved over the IND. RMSE generally lower than 0.7 m and
<span class="inline-formula"><i>r</i></span> higher than 0.9 were obtained.</p> |
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