Dettaglio del documento
Le bilan hydrologique à l’échelle nationale : Etude de cas de la Tunisie
Abstract
The shortage of water resources in Tunisia, their fragility and unequal distribution originate a scarcity hazard that increases conflicts between the different uses of a resource, which is already limited.Assessing the hydrologic balances of all large catchments of Tunisia is an essential step in a process directed towards a better and more efficient management of water resources. In this framework, the rainfall supply is determined using two methods (isohyetal lines and Thiessen) ; potential evapotranspiration is calculated by Hargreaves’ equation. Lastly, crop water requirements are determined based on soil properties using the pedo-transfer function ( PTF). Results have shown that evapotranspiration increases in the North-South direction. It ranges from 25% of rainfal supply in the North to 80% in the South where it is associated with low rainfall. This results in an overall water deficit all over the country.