Noureddine GAALOUL

... Pollution of some shallow aquifers by nitrates constitutes also a major risk for domestic requirements. ... Page 10. 248 • The coastal zone between ... The fact, that groundwater is a part of total water resources is the most important in estimating perspectives of fresh ground-water use. ...

-Report card, a management tool for migratory fishes: concept and thought about indicators to be developed for the Allis shad population in Gironde-Garonne-Dordogne catchment (France) by Woillez, M.((Cemagref Institut de Recherche pour l'Ingénierie de l'Agriculture ...

-Report card, a management tool for migratory fishes: concept and thought about indicators to be developed for the Allis shad population in Gironde-Garonne-Dordogne catchment (France) by Woillez, M.((Cemagref Institut de Recherche pour l'Ingénierie de l'Agriculture ...

Tunisia is one of the countries in the Mediterranean basin least well endowed with water resources. Water resources in Tunisia are characterized by scarcity and a pronounced irregularity. By adopting an integrated strategy for the use of water based on scientific and ...

... Foued El Ayni·Semia Cherif·Amel Jrad· Malika Trabelsi-Ayadi ... F. El Ayni · M. Trabelsi-Ayadi Laboratoire d'application de la chimie aux ressources et substances naturelles et à l'environnement, Faculté des Sciences de Bizerte, Bizerte, Tunisia ...

... Ces méthodes ont été appliquées, à la modélisation de ressources en eau du bassin versant ... Une base de données sur la gestion des ressources en eau (hydrologie et hydrogéologie) (1963 ... Le bilan hydrologique de la région a été déterminé suivant les conditions du calage du ...

A research has been carried out to investigate the effects of below sea level mining on the cement raw material quality of a limestone quarry located adjacent to the shoreline near Darica-Kocaeli-Turkey. Field studies involved rock mass characterization through discontinuity surveys performed at the working benches of the quarry as well as on the core samples, monitoring of groundwater levels, performance of water pressure tests, and in-situ hydrochemical measurements. Hydrogeological data suggest that the carbonate sequence forms a poor unconfined aquifer having hydraulic conductivity values ranging between 10(-6) m/s and 10(-8) m/s. In the quarry, water seepages can only be observed at the shear zones. Electrical conductivity profiles taken from the boreholes located at various distances from the shore line indicated the present position of the salt water wedge.

ABSTRACT During the last few decades, the Grombalia shallow, an unconfined aquifer, had been under stress by groundwater pumping due to the increasing population and development of agricultural activity. Recently, the aquifer has displayed an important decline in the water level of boreholes and wells, and considerable deterioration of groundwater quality due to saltwater intrusion. A groundwater numerical model for the Grombalia aquifer has been developed based on the Visual Modflow 3.1 code to simulate the groundwater changes under steady state regime and transient conditions. The results of the model show reasonable agreement between observed and estimated groundwater levels in the observation wells. Sebkaht Soliman wetland aquifer connection has been identified. This paper presents the effect of different groundwater management scenarios and pumping discharge on groundwater resources in the Grombalia aquifer (Cap-Bon peninsula, Tunisia).

""L’objet principal de cette communication est de faire un constat sur l’état actuel de l’invasion marine ‎après cinq ans de suivi de la recharge artificielle par les eaux usées traités de la nappe Korba -Mida du ‎Cap Bon au Nord Est de Tunisie.
contacter Mr Gaaloul par e-mail pour plus d'information
ngaaloul2003@yahoo.fr
gaaloul.noureddine@iresa.agrinet.tn

Une modélisation d’écoulement au niveau du site de recharge artificielle Korba-Mida a été réalisée afin ‎d'étudier et de prévoir l'impact de l’alimentation par les eaux usées traitées issues de la station de Korba. Le ‎calage du modèle est effectué en régime permanent (2008) avant recharge  puis en régime transitoire (2008-‎‎2013).‎
contacter Mr Gaaloul par e-mail pour plus d'information
ngaaloul2003@yahoo.fr
gaaloul.noureddine@iresa.agrinet.tn

The Korba aquifer on the east coast of Cape Bon has been overexploited since the 1960s with a resultant reversal of the hydraulic gradient and a degradation of the quality due to seawater intrusion. In 2008 the authorities introduced integrated water resources planning based on a managed aquifer recharge with treated wastewater. Water quality monitoring was implemented in order to determine the different system components and trace the effectiveness of the artificial recharge. Groundwater samples taken from recharge control piezometers and surrounding farm wells were analyzed for their chemical contents, for their B isotopes, a proven tracer of groundwater salinization and domestic sewage, and their carbamazepine content, an anti-epileptic known to pass through wastewater treatment and so recognized as a pertinent tracer of wastewater contamination. The system equilibrium was permanently disturbed by the different temporal dynamics of continuous processes such as cation exchange, and by threshold processes linked to oxidation–reduction conditions. The B isotopic compositions significantly shifted back-and-forth due to mixing with end-members of various origin. Under the variable contribution of meteoric recharge, the Plio-Quaternary groundwater (δ11B of 35–40.6‰, a mean B concentration of 30 μmol/L, no carbamazepine, n = 7) was subject to seawater intrusion that induced a high δ11B level (δ11B of 41.5–48.0‰, a mean B concentration of 36 μmol/L, and n = 8). Fresh groundwater (δ11B of 19.89‰, B concentration of 2.8 μmol/L, no carbamazepine) was detected close to the recharge site and may represent the deep Miocene pole which feeds the upper Plio-Quaternary aquifer. The managed recharge water (δ11B of 10.67–13.8‰, n = 3) was brackish and of poor quality with a carbamazepine content showing a large short term variability with an average daily level of 328 ± 61 ng/L. A few piezometers in the vicinity of the recharge site gradually acquired a B isotopic composition close to the wastewater signature and showed an increasing carbamazepine content (from 20 to 910 ng/L). The combination of B isotopic signatures with B and carbamazepine contents is a useful tool to assess sources and mixing of treated wastewaters in groundwaters. Effluent quality needs to be greatly improved before injection to prevent further degradation of groundwater quality.

ABSTRACT Mediterranean coastal aquifers are highly stressed, partly because of intensive agricultural activities in semi-arid or arid context. Water quality of groundwater is often degraded by different processes: salt water intrusion, diffuse pollution... In this context, the Korba aquifer on the eastern coast of Cape Bon (Tunisia) undergoes overexploitation. Since the 60's, reversal of hydraulic gradient and saline intrusion were studied (Ennabli, 1980; Kouzana et al. 2009a , 2009b; Kouzana et al., 2010) and the groundwater hydrogeological functioning was modeled (Kerrou et al., 2010; Panicoti et al. 2001a, 2001b; Zghibi et al., 2011). Crucial for local agriculture, aquifer management led to the implementation of artificial recharge with treated wastewaters at the end of 2008. Since then, groundwater quality was monitored to trace the effectiveness of artificial recharge, based on boron isotopes, to better determine the different system components. Samples were taken from recharge control piezometers and in farmers' wells. Cation exchange was demonstrated to be one of the main processes controlling the groundwater quality. Sodium, potassium and boron were clearly in deficit compared to a mixing line with seawater, whereas calcium, strontium and bicarbonates were in excess. Treated wastewaters were concentrated in chloride and sodium and sometimes more than in wells, equivalent to a mixing of 6 to 14 % with sea water. The 2009 isotopic signatures in wells were clearly distributed on a mixing line between a nitrate-polluted and salinized pole especially constituted by abandoned wells and which had already reached equilibrium governed by cation exchange or sorption processes, and fresh groundwater. This mixing line explained the intermediate composition of a less salinized groundwater pole of intensively pumped wells. In 2010, in a context of low rainwater inputs, a general decrease of δ11B in the same wells may indicate mixing with deeper groundwaters and a continuous isotopic re-equilibration between the two previous end-members according to the different inputs, e. g. rainwater recharge or river flows. δ11B increased between 2010 and 2011 up to their 2009 value. Such a variation between 2010 and 2011 cannot be linked to a simple cation exchange but appear more reasonably linked to a higher rainfall recharge after a rainy winter. The mixing of treated wastewater was estimated at a maximum of 30 % with groundwaters and seemed very local. According to fluxes directions, artificial recharge could clearly not influence some wells composition. The impact of artificial recharge seemed thus very limited in terms of quality: recharge waters were salted and poorly contribute to refresh the system. Ultimately, the degradation of irrigated soils and crops diversity, currently limited by salt tolerance, will not improve. Moreover, B isotopes showed that artificial recharge seemed to influence some piezometers at vicinity but had low impact, if any, on close farmers' wells.

ABSTRACT This paper focuses on the work done through the INRGREF to collect and analyse available information on water resources in Tunisia. It presents the quantity and quality of surface and groundwater resources data. Water resources in Tunisia are characterised by scarcity and a pronounced irregularity. Tunisia has been able to develop a complex and diverse water infrastructure allowing the country to mobilise and exploit available water resources. This paper is intended to provide an overview of the current water situation in Tunisia by presenting its water potential with a focus on its regime and spatial variability, water demand trends for the different economic sectors, the choices made to manage the water balance deficits, and the various problems and challenges faced in managing this resource.

La disponibilité des ressources en eau dans les régions côtières est très affectée par l'intrusion marine dans les systèmes aquifères. En effet, durant les périodes de sécheresse prolongées et pour des opérations excessives de pompage, l'équilibre naturel de la surface ...

... 1) : le lac-réser-voir de Pannecière (82.5 M de m3) sur l'Yonne, le lac-réser-voir SEINE ou Lac d'Orient (219.5 M de m3), le lac-réser-voir MARNE ou Lac du Der-Chantecoq (364.5 M de m3) et le lac-réservoir AUBE formé par le lac Amance et lac du Temple (183.5 M de m3). ...

Ressources en Eau & Changement Climatique en Région Méditerranéenne. 3éme Colloque International Eau–Climat’2014 : REGARDS CROISES NORD – SUD, 21, 22 & 23 Octobre 2014 Hammamet (Tunisie). Les Actes du séminaire Eau-Climat’2014. Volume 1: Eau de surface en région Méditerranéenne 300 pages. Volume II: Eau souterraine en région Méditerranéenne 271 pages. Volume III: Changement climatique en région Méditerranéenne 205 pages

Ressources en Eau & Changement Climatique en Région Méditerranéenne. 3éme Colloque International Eau–Climat’2014 : REGARDS CROISES NORD – SUD, 21, 22 & 23 Octobre 2014 Hammamet (Tunisie). Les Actes du séminaire Eau-Climat’2014. Volume 1: Eau de surface en région Méditerranéenne 300 pages. Volume II: Eau souterraine en région Méditerranéenne 271 pages. Volume II1: Changement climatique en région Méditerranéenne 205 pages

Ressources en Eau & Changement Climatique en Région Méditerranéenne. 3éme Colloque International Eau–Climat’2014 : REGARDS CROISES NORD – SUD, 21, 22 & 23 Octobre 2014 Hammamet (Tunisie). Les Actes du séminaire Eau-Climat’2014. Volume 1: Eau de surface en région Méditerranéenne 300 pages. Volume II: Eau souterraine en région Méditerranéenne 271 pages. Volume II1: Changement climatique en région Méditerranéenne 205 pages