By Mohamed Tahar, Lamia Boureboune (auth.), Alberto Marini, Mohamed Talbi (eds.)
This booklet collects the result of a pragmatic adventure of survey, in the course of the direct keep an eye on of satellite tv for pc photographs from excessive to medium solution, over parts subjected to desertification difficulties. the issues of the neighborhood inhabitants are heavily tied to the equilibrium within the administration of the territory, that's compromised by means of the problems of protecting conventional methodologies of administration. the hot survey applied sciences, in keeping with the distant Sensing and Geographic info method, let studying the main points of the current state of affairs and indicate the dynamism of the phenomena and the affects with anthropogenic activities.
Training has been conducted within the Tozeur sector, in crucial Tunisia, the place contributors had the opportunity to research at the box a sequence of alternative elements. It has additionally been attainable to debate related stories in far away territories and the significance of the actual procedures of desertification. through the improvement of the extensive education at the activity, visits to entrepreneurial truths in regards to the administration of the territory were performed. The analyzed region reveals in tourism a solution to the prerequisites of bettering the dwelling stipulations of the population.
Specialists from twelve countries offered activities of administration of the territory, with exact cognizance on environmental safeguard and the stipulations of the territory. From the observations performed the fragility of the panorama of the oases has emerged, that are subjected to overall anthropogenic administration and accordingly heavily associated with the provision of the really good employees within the conventional methodologies. it truly is common that the administration of the lands alterations based on glossy applied sciences, yet, with a too quickly speed, this evolution dangers to dissatisfied the administration of the territory. The trade of knowledge, the facility to map the differences, the discussion among the components, will want the upkeep of the political safeguard within the Mediterranean area. This adventure of cooperation and organization constitutes a precedent for the advance of a process of excessive schooling classes to be supplied to the neighborhood groups for the typical wellbeing.
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Additional resources for Desertification and Risk Analysis Using High and Medium Resolution Satellite Data: Training Workshop on Mapping Desertification
27–29 décembre 1972. Rapport de synthèse, Gabès. 24 p. Mzabi H. 1988. La Tunisie du Sud-Est: géographie d’une région fragile, marginale et dépendante, thèse de Doctorat d’Etat. Université de Tunis I. 2 tomes. 941 p. Nasr N. 1993. Systèmes agraires et organisations spatiales en milieu aride: cas d’ElFerch et du Dahar de Chenini – Guermessa, thèse de Doctorat en Géographie. Université Paul Valery, Montpellier III, 1993. 217 p. Novikoff G. 1983. Essai de lutte contre l’érosion éolienne dans les parcours à Rhanterium suaveolens de la Jeffara et leur application.
Conversely, desertification aggravates carbon dioxide (CO2)-induced climate change through the release of CO2 from cleared and dead Climate Change and the Need for Renewable Energy Sources 21 vegetation and reduction of the carbon sequestration potential of desertified land. Although the relative importance of climatic and anthropogenic factors in causing desertification remains unresolved, evidence shows that certain arid, semi-arid, and dry subhumid areas have experienced declines in rainfall, resulting in decreases in soil fertility and agricultural, livestock, forest, and rangeland production.
The analysis of the satellite image of 1996 shows that, near areas irrigated by drillings (which can be recognized by their specific spectral signature), there are a “gallery” vegetation (especially reeds) that grows along the water course to Sebkahs and that is colonizing more and more areas, as well as many “lakes” that results from enormous amounts of artesian water coming from hundreds of “hand-drillings”. In the southern Nefzaoua region, there is the following chain reaction due to this huge amount of water that pours out and then evaporates: • • • Because there are so many artesian “hand-drillings” there is an unprecedented over-exploitation of resources and a quick drawdown of the water table.