Application of Meteosat thermal data to map soil infiltrability in the central part of the Lake Chad basin, Africa.
Identifieur interne : 00AF58 ( Main/Exploration ); précédent : 00AF57; suivant : 00AF59Application of Meteosat thermal data to map soil infiltrability in the central part of the Lake Chad basin, Africa.
Auteurs : Marc Leblanc [France, Royaume-Uni, Australie] ; Moumtaz Razack [France] ; Dominique Dagorne [France] ; Linus Mofor [Royaume-Uni] ; Chris Jones [Royaume-Uni]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2003-10.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Tchad.
- topic : Eau souterraine, Interprétation.
English descriptors
- KwdEn :
- Africa, Aquifer, August, Brightness temperature, Brightness temperatures, Cardiff university, Central part, Chad, Chad Basin, Coastal aquifers, Composite images, Cooler ground, Deakin university, General rule, Groundwater, Groundwater recharge, Heavy rainfall, Human extractions, Infiltrability, Lake Chad, Lake chad basin, Land surface temperature, Large part, Leblanc, Main water resource, Manga area, Meteosat, Meteosat tmax data, Piezometric, Piezometric depressions, Poitiers cedex, Qualitative information, Quaternary, Quaternary aquifer, Rainwater infiltrability, Rainy season, Recharge, Satellite data, September, Soil infiltrability, Soil moisture, Soil moisture distribution, Solar insolation, Space time, Spatial resolution, Surface phenomenon, Surface temperature, Temporal resolution, Tmax, Tmax data, Tmax data show, Water resources management, Water table, aquifers, depressions, interpretation, rain water, rainfall, soil moisture, soils, soils maps, water resources.
- Teeft :
- Aquifer, August, Brightness temperature, Brightness temperatures, Cardiff university, Central part, Chad, Coastal aquifers, Composite images, Cooler ground, Deakin university, General rule, Groundwater, Groundwater recharge, Heavy rainfall, Human extractions, Infiltrability, Lake chad basin, Land surface temperature, Large part, Leblanc, Main water resource, Manga area, Meteosat, Meteosat tmax data, Piezometric, Piezometric depressions, Poitiers cedex, Qualitative information, Quaternary, Quaternary aquifer, Rainwater infiltrability, Rainy season, Recharge, Satellite data, September, Soil infiltrability, Soil moisture, Soil moisture distribution, Solar insolation, Spatial resolution, Surface temperature, Temporal resolution, Tmax, Tmax data, Tmax data show, Water resources management, Water table.
Abstract
In the central part of the Lake Chad Basin, Africa, the superficial Quaternary aquifer (500,000 km2) forms the main water resource. Little is known about the aquifer recharge processes. Large piezometric depressions affect the aquifer and are still unexplained. Meteosat thermal composite data were used to infer qualitative information about time‐space variations of soil moisture. Over the aquifer, Meteosat data reveal that after heavy rainfall, the piezometric depressions (Kadzell, Chari‐Baguirmi) appear cooler than the surrounding areas (Manga and Harr). The interpretation is that above the depressions, rainwater accumulates at the surface and does not infiltrate deep into the ground, leading to the observed cooler ground. Accordingly, the depressions are characterized by low rainwater infiltrability, which presumably results in a small rainfall recharge. As far as we know, this is the first time that an observed surface phenomenon is directly related to the origin of some piezometric depressions.
Url:
DOI: 10.1029/2003GL018094
Affiliations:
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Cardiff</wicri:regionArea><wicri:noRegion>Cardiff</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Geophysical Research Letters</title><title level="j" type="alt">GEOPHYSICAL RESEARCH LETTERS</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><biblScope unit="vol">30</biblScope><biblScope unit="issue">19</biblScope><biblScope unit="page-count">4</biblScope><date type="published" when="2003-10">2003-10</date></imprint><idno type="ISSN">0094-8276</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Africa</term><term>Aquifer</term><term>August</term><term>Brightness temperature</term><term>Brightness temperatures</term><term>Cardiff university</term><term>Central part</term><term>Chad</term><term>Chad Basin</term><term>Coastal aquifers</term><term>Composite images</term><term>Cooler ground</term><term>Deakin university</term><term>General rule</term><term>Groundwater</term><term>Groundwater recharge</term><term>Heavy rainfall</term><term>Human extractions</term><term>Infiltrability</term><term>Lake Chad</term><term>Lake chad basin</term><term>Land surface temperature</term><term>Large part</term><term>Leblanc</term><term>Main water resource</term><term>Manga area</term><term>Meteosat</term><term>Meteosat tmax data</term><term>Piezometric</term><term>Piezometric depressions</term><term>Poitiers cedex</term><term>Qualitative information</term><term>Quaternary</term><term>Quaternary aquifer</term><term>Rainwater infiltrability</term><term>Rainy season</term><term>Recharge</term><term>Satellite data</term><term>September</term><term>Soil infiltrability</term><term>Soil moisture</term><term>Soil moisture distribution</term><term>Solar insolation</term><term>Space time</term><term>Spatial resolution</term><term>Surface phenomenon</term><term>Surface temperature</term><term>Temporal resolution</term><term>Tmax</term><term>Tmax data</term><term>Tmax data show</term><term>Water resources management</term><term>Water table</term><term>aquifers</term><term>depressions</term><term>interpretation</term><term>rain water</term><term>rainfall</term><term>soil moisture</term><term>soils</term><term>soils maps</term><term>water resources</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Afrique</term><term>Aquifère</term><term>Bassin Tchad</term><term>Carte pédologique</term><term>Dépression</term><term>Eau pluie</term><term>Espace temps</term><term>Humidité sol</term><term>Interprétation</term><term>Lac Tchad</term><term>Phénomène surface</term><term>Pluie</term><term>Quaternaire</term><term>Ressource eau</term><term>Sol</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Aquifer</term><term>August</term><term>Brightness temperature</term><term>Brightness temperatures</term><term>Cardiff university</term><term>Central part</term><term>Chad</term><term>Coastal aquifers</term><term>Composite images</term><term>Cooler ground</term><term>Deakin university</term><term>General rule</term><term>Groundwater</term><term>Groundwater recharge</term><term>Heavy rainfall</term><term>Human extractions</term><term>Infiltrability</term><term>Lake chad basin</term><term>Land surface temperature</term><term>Large part</term><term>Leblanc</term><term>Main water resource</term><term>Manga area</term><term>Meteosat</term><term>Meteosat tmax data</term><term>Piezometric</term><term>Piezometric depressions</term><term>Poitiers cedex</term><term>Qualitative information</term><term>Quaternary</term><term>Quaternary aquifer</term><term>Rainwater infiltrability</term><term>Rainy season</term><term>Recharge</term><term>Satellite data</term><term>September</term><term>Soil infiltrability</term><term>Soil moisture</term><term>Soil moisture distribution</term><term>Solar insolation</term><term>Spatial resolution</term><term>Surface temperature</term><term>Temporal resolution</term><term>Tmax</term><term>Tmax data</term><term>Tmax data show</term><term>Water resources management</term><term>Water table</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Tchad</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Eau souterraine</term><term>Interprétation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">In the central part of the Lake Chad Basin, Africa, the superficial Quaternary aquifer (500,000 km2) forms the main water resource. Little is known about the aquifer recharge processes. Large piezometric depressions affect the aquifer and are still unexplained. Meteosat thermal composite data were used to infer qualitative information about time‐space variations of soil moisture. Over the aquifer, Meteosat data reveal that after heavy rainfall, the piezometric depressions (Kadzell, Chari‐Baguirmi) appear cooler than the surrounding areas (Manga and Harr). The interpretation is that above the depressions, rainwater accumulates at the surface and does not infiltrate deep into the ground, leading to the observed cooler ground. Accordingly, the depressions are characterized by low rainwater infiltrability, which presumably results in a small rainfall recharge. As far as we know, this is the first time that an observed surface phenomenon is directly related to the origin of some piezometric depressions.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Royaume-Uni</li></country></list><tree><country name="France"><noRegion><name sortKey="Leblanc, Marc" sort="Leblanc, Marc" uniqKey="Leblanc M" first="Marc" last="Leblanc">Marc Leblanc</name></noRegion><name sortKey="Dagorne, Dominique" sort="Dagorne, Dominique" uniqKey="Dagorne D" first="Dominique" last="Dagorne">Dominique Dagorne</name><name sortKey="Razack, Moumtaz" sort="Razack, Moumtaz" uniqKey="Razack M" first="Moumtaz" last="Razack">Moumtaz Razack</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Leblanc, Marc" sort="Leblanc, Marc" uniqKey="Leblanc M" first="Marc" last="Leblanc">Marc Leblanc</name></noRegion><name sortKey="Jones, Chris" sort="Jones, Chris" uniqKey="Jones C" first="Chris" last="Jones">Chris Jones</name><name sortKey="Mofor, Linus" sort="Mofor, Linus" uniqKey="Mofor L" first="Linus" last="Mofor">Linus Mofor</name></country><country name="Australie"><noRegion><name sortKey="Leblanc, Marc" sort="Leblanc, Marc" uniqKey="Leblanc M" first="Marc" last="Leblanc">Marc Leblanc</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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