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Accueil du site → Doctorat → Italie → Quantitative status, vulnerability and pollution of groundwater resources in different environmental and climatic contexts in Sardinia and in Ethiopia

Universita’ degli Studi di Cagliari (2012)

Quantitative status, vulnerability and pollution of groundwater resources in different environmental and climatic contexts in Sardinia and in Ethiopia

Bushra, Abdelwassie Hussien

Titre : Quantitative status, vulnerability and pollution of groundwater resources in different environmental and climatic contexts in Sardinia and in Ethiopia

Auteur : Bushra, Abdelwassie Hussien

Université de soutenance : Universita’ degli Studi di Cagliari

Grade : Doctoral Thesis 2012

Résumé _ The Raya Valley is located in the northern part of Ethiopia within the Regional State of Tigray. The valley is part of the series of grabens at the western margins of the Afar Depression. Rainfall in this area is erratic both in time and space ; hence it has suffered from a number of severe droughts and associated famines, and is chronically food-insecure. The surface water resources are characterized by streams, which flow strongly during the short rainy season and no perennial flow of surface water there is during the dry period, except the minor seepages that die out within a short distance in the valley. Therefore, groundwater is the only source for both domestic and irrigational development. Previous studies were confined to developing these resources. Hence, the objective of this research, in the Raya Valley, is to understand and to characterize the groundwater system of Raya Valley, using hydrogeology, groundwater chemistry and isotope hydrology tools and to come up with different options that may help to monitor for efficient management of the groundwater. In the meantime, this work incorporated water balance evaluation and identification of the degree of vulnerability to contaminants of the Rio Mannu di Pabillonis Basin in the central part of Sardinia, Italy. Finally corresponding results were compared in relation to their climatic differences. Field traverses have been undertaken to collect relevant information regarding geology, hydrology, and hydrogeology in the Raya Valley (in 2009, 2010 and 2011) and in the Rio Mannu di Pabillonis Basin (in 2010 and 2011). An inventory of groundwater levels of boreholes and springs was made. Land-use was also investigated during field visits to be used as ground truth for the verification of existing maps. The isopiezometric/static water level contour maps show that the groundwater flow toward the centre and then all flow to the south in a similar fashion to the surface water, in the Raya Valley. In the Rio Mannu Basin, the groundwater flow direction is also to the centre of the basin and finally toward the north, following the topographic gradient. Water samples, from Raya Valley and Rio Mannu Basin, were collected and analyzed and results were compared with Ethiopian and Italian drinking water standards, respectively.

Mots clés : Recharge, groundwater temperature, stable isotopes, vulnerability to pollution

Présentation (UniCA Eprints)

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Page publiée le 29 octobre 2016, mise à jour le 22 avril 2020