Solr Search · GéoProdig, portail d'information géographique

Fishing and farming at Lake Chad : responses to lake-level fluctuations
Agricultural calender ; Chad Lake ; Farming system ; Fishing ; Impact ; Irrigation ; Lacustrine basin ; Lake ; Lake level ; Lake shore ; Nigeria ; Remote sensing ; Rural community ; Rural development

Cultivation of the floor of Lake Chad : a response to environmental hazard in Eastern Borno, Nigeria

Meteosat-based evapotranspiration and thermal inertia mapping for monitoring transgression in Lake Chad region and Niger delta

Some new insights on fluvial dynamics and Holocene landscape evolution in the Nigerian Chad Basin
The paper features some recent results on the Young Quaternary floodplain development in the middle to lower catchment of the Komadugu Yobe, a main northeast-Nigerian tributary to Lake Chad. The major aim of the study was the reconstruction
of spatio-temporal changes in the fluvial response, the assessment of the system as one of the last untapped regional palaeo-ecological archives, and the chronological integration into the existing climato-stratigraphic models of the southwestern Chad Basin

Socio-economic dislocations resulting from agro-technical transformations in the Lake Chad Basin in Africa

Estimates of past climate at paleolake Chad, North Africa, based on a hydrological and energy-balance model
Two versions of the model are developed. The first version is one in which precipitation and lake area are linearly related. This version requires specification first of the area, net radiation, and Bowen ratio of the lake and second
of the paleovegetation, net radiation, and Bowen ratio of the surrounding basin. In the second version of the model the relationship between precipitation and lake area is nonlinear because the run off ratio and Bowen ratio of the basin are made functions
of precipitation. As the lake increases in area in response to increased precipitation, this version of the model allows for further increases in run off (from the basin into the lake) as the vegetation changes from steppe to savanna and swamp. This nonlinear

Africa ; Arid area ; Chad ; Desertification ; Drought ; Lake ; Watershed
basin of lake Chad, that is responsible of most of the water of four wide countries, in one of the most dry region of the world. - (NF)

Bilan hydrologique mensuel et modélisation sommaire du régime hydrologique du lac Tchad. (Monthly water balance and modelling of the water regime of the Lake Chad)

Aeolian features ; Cameroon ; Chad ; Dune ; Lake level ; Palaeogeography ; Palaeolake ; Quaternary ; Sand bar

Atlas d'élevage du Bassin du Lac Tchad

Livestock atlas of the Lake Chad Basin
Africa ; Agro-pastoralism ; Atlas ; Cameroon ; Chad ; Desertification ; Fauna ; Fish breeding ; Hydrogeology ; Lake ; Lake Chad ; Livestock ; Livestock farming ; Niger ; Nigeria ; Nomadism ; Pastoral ; Poverty ; Regional economy ; Remote sensing

Nature and distribution of Harmettan dust

Harmettan dust deposition rates measured at Kano northern Nigeria during 1976-1979 range from 137 to 181 t/km/y. The characteristics and geomorphic history of the Chad Basin source deposits are inferred from the broad particle-size range
, and the mineralogical and geochemical characteristics of the deposited dust. Sediment supply to the lake source deposits involves fluvio-lacustrine transport of clays, with fluvial transport and salt weathering of silts and aeolian transport of sands. Subsequent aeolian

MAN and the LAKE

MAN and the LAKE
Africa ; Agro-pastoralism ; Boundary ; Cameroon ; Chad ; Climatic change ; Decision making process ; Environmental management ; Lacustrine basin ; Lake ; Livestock farming ; Local economy ; Man-environment relations ; Migration ; Nigeria

Natural hazards in the Chad basin region

Natural hazards in the Chad basin region
The processes of desertization and desertification especially under condition of climatic deterioration in the Chad Basin Region have been found to precipitate natural disasters. These have led to repeated crop failures as well as the loss

Atlantic Ocean ; Chad ; Interannual variability ; Lake ; Lake level ; Ocean atmosphere interaction ; Precipitation ; Surface temperature ; Teleconnection ; Time series

Alluvial plain ; Chad ; Floodplain ; Geochronology ; Holocene ; Lake ; Lake level ; Quaternary ; Surface deposits ; Terrace

Approaches to the study of food and prestige in Savannah tribes: Massa and Mussey of northern Cameroon and Chad

Politics and marriage in South Kanem (Chad)| a statistical presentation of endogamy from 1895 to 1975

Agricultural land use ; Archaeology ; Chad ; Climate ; Egypt ; Geology ; Holocene ; Libya ; Sahara ; Settlement history ; Sudan
Geological and archaeological data from the now hyper-arid Eastern Sahara of Egypt, Sudan, Libya and Chad reveal close links between climatic variations and prehistoric occupation during the Holocene. At about 8,500 B.C.E., the Sahara´s margin
shifted up to 800 km north to latitude 24° N within a few centuries, bringing monsoonal rainfall to most of the former desert. Savannah-type vegetation and the formation of lakes and temporary rivers resulted in the rapid dissemination of wild fauna

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