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:	A. T. Diepkilé, F. Egon, F. Blarel, E. Mougin, F. Frappart
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/c8e14479d0504006ab985c1286fbe526
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spelling	oai:doaj.org-article:c8e14479d0504006ab985c1286fbe5262021-11-16T06:47:20ZValidation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta10.5194/piahs-384-31-20212199-89812199-899Xhttps://doaj.org/article/c8e14479d0504006ab985c1286fbe5262021-11-01T00:00:00Zhttps://piahs.copernicus.org/articles/384/31/2021/piahs-384-31-2021.pdfhttps://doaj.org/toc/2199-8981https://doaj.org/toc/2199-899X<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>A. T. DiepkiléF. EgonF. BlarelE. MouginF. FrappartCopernicus PublicationsarticleEnvironmental sciencesGE1-350GeologyQE1-996.5ENProceedings of the International Association of Hydrological Sciences, Vol 384, Pp 31-35 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental sciences GE1-350 Geology QE1-996.5 A. T. Diepkilé F. Egon F. Blarel E. Mougin F. Frappart Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
description	<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>
format	article
author	A. T. Diepkilé F. Egon F. Blarel E. Mougin F. Frappart
author_facet	A. T. Diepkilé F. Egon F. Blarel E. Mougin F. Frappart
author_sort	A. T. Diepkilé
title	Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
title_short	Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
title_full	Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
title_fullStr	Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
title_full_unstemmed	Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta
title_sort	validation of the altimetry-based water levels from sentinel-3a and b in the inner niger delta
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/c8e14479d0504006ab985c1286fbe526
work_keys_str_mv	AT atdiepkile validationofthealtimetrybasedwaterlevelsfromsentinel3aandbintheinnernigerdelta AT fegon validationofthealtimetrybasedwaterlevelsfromsentinel3aandbintheinnernigerdelta AT fblarel validationofthealtimetrybasedwaterlevelsfromsentinel3aandbintheinnernigerdelta AT emougin validationofthealtimetrybasedwaterlevelsfromsentinel3aandbintheinnernigerdelta AT ffrappart validationofthealtimetrybasedwaterlevelsfromsentinel3aandbintheinnernigerdelta
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Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta

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