REMOTE SENSING AND GIS APPLICATIONS FOR WATER RESOURCES MANAGEMENT IN CHAD BASIN, AFRICA

摘要

The Lake Chad Basin covers an area of two million, three hundred and fifty five thousand square kilometers (2,355,000 km_3) making it the largest drainage of any single lake in the world. The conventional basin is only nine hundred and seventy six thousand square kilometers (976,000 km_3) and figure 1 shows the hydrographic and conventional basins. Several countries share this basin and they are Algeria, Cameroon, Central African Republic, Chad, Niger, Nigeria, and Sudan. However, only these four countries border the Lake Chad: Cameroon, Chad, Niger and Nigeria. Lake Chad is divided into north and south basins roughly of equal surface area. A ridge (Grange Barrier) separates the two basins with a northeast-southwest trend. The lowest portion within the lake has an altitude of 275.5 m in the south basin. The north basin is dry during low water levels of the lake as the north basin is around 276.5 m above mean sea level.