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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectives45 mmMAPPING OF GROUNDWATER SALINIZATION USING TIME DOMAINELECTROMAGNETIC INDUCTION IN A SMALL COASTAL SEMI-ARID AQUIFERIN CAPBON, NORTHEASTERN OF TUNISIAChekirbane Anis 1 ; Maki Tsujimura 1 ; Atsushi Kawachi 1 ; Hiroko Isoda 1 ; TarhouniJamila 2 ; Wataru Yamada 1 ; Mizuho Takahashi 1 ; Amri Faouzi 3anischkirbene@gmail.com1 - University of Tsukuba, Japan; 2 - National Institute of Agronomy (INAT), Tunisia;3 - Ministry of Agriculture and Water Resources, TunisiaUniversity of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 JapanAbstract. The study area is a small coastal plain drained by an ephemeral stream networksubject of several pollutant discharges such as oilfield brine coming from a neighboring oilcompany and wastewater from Somaa city located in the upstream of the plain. Furthermore,a hydraulic depression of more than -5 m a.s.l is observed near the coastal part of the aquifer.Associated with high salinity of groundwater, it is the proof of seawater intrusion. TimeDomain Electromagnetic method (TDEM) based on 28 soundings was conducted in Wadi AlAyn plain to delineate the saline groundwater. Basing on longitudinal and transversalresistivity 2D-pseudosections calibrated with observed boring data, resistivity values lesssaltwater plume. Measured electrical conductivity of groundwaterwas also used for calibration. In the upstream part of the plain, the saltwater plume is due tothe infiltration of oilfield brine through the sandy bed of Wadi Al Ayn. It is longitudinallyfound in depths reaching -75 m. However, in the coastal part of the aquifer, groundwatersalinization is due to seawater intrusion and the salty water is located between 30 – 60 mdepth and has an inland extent around 2 km from the shore line.Keywords: Wadi Al Ayn plain, saline intrusion, TDEM, resistivity sounding56
22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectives45 mm1. INTRODUCTIONSince the 2000s, a sudden change of groundwater salinity was registered in the wellsexploiting the shallow aquifer at Wadi Al Ayn plain in CapBon and was reported andcomplained by local farmers. However, groundwater salinization origin and processes arestill poorly understood. This study aims to investigate the spatial extent of the saline plumecontaminating the groundwater in Wadi Al Ayn plain, CapBon, northeastern of Tunisia,basing on Time Domain Electromagnetic investigation. The study area is the plain of Wadi AlAyn, a small coastal semi-arid floodplain located in CapBon peninsula, northeastern ofTunisia (Fig.1). The study area is located in the vicinity of an oilfield exploited since 1994.Oil production is accompanied by water with high salinity called oilfield brine. Since thebeginning of exploitation in Zinnia oilfield company in 1994 until its end in late 2009, theseparated brine from oil are directly rejected in the sandy bed of Wadi Al Ayn without anytreatment. In Al Ayn plain, the Quaternary sediments and the top layers of the Upper Mioceneare hosting a significant shallow aquifer used principally for irrigation and drinking purposes(Ben Salem, 1992).2. METHODOLOGYFig.1: Geological map of the study areaThe TDEM system used in the survey consisted of square transmitter (Tx) loop (50 m by 50 m)and a medium air coil receiver (Rx) antenna located inside the loop, commonly known as acentral loop array (McNeill, 1994). The current driven through the transmitter loop creates aprimary magnetic field. During the rapid current turnoff, this primary magnetic field is timevariantand in accordance with Faraday’s Law; an electromagnetic induction is produced,which in turn results in eddy current flow in the subsurface. The intensity of these currents at57
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SWIM22 - 22 nd Salt Water Intrusion
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Local Supporting Organizing TeamMar
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Peter StuyfzandKiwa Water Research,
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PrefaceWelcome to the 22 nd Salt Wa
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GROUNDWATER ARTIFICIAL RECHARGE IN
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New approaches onmodelling (general
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Ruben Caljé 1 ; Frans Schaars 1 ;
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Figure 2: The modeled interface dep
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Selected case studies
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CONCEPTUAL MODEL OF DAR ES SALAAM Q
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1. INTRODUCTION 2. HYDROGEOCHEMI
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1,61,41,210,80,60,40,20H-3 (TU)Luiz
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Saltwater intrusionsAquifer partly
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U4Quakenbrück212
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Understanding of salinewater hydrod
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Marie Perriquet 1,2 ;Tiernan Henry
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ACKNOWLEDGEMENTREFERENCES234
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1. INTRODUCTION2. EXAMPLE: UPCONING
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Figure 1. Computed density and mole
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Depth (m)22 nd Salt Water Intrusion
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