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Therefore, it was clarified that the brine below the depth of 800m bgs was palaep-seawater.CONCLUDING REMARKSExistence of five hydrological zones with different origin was identified from the verticalprofile of Cl - and existed up to 300m bgs and was storedunder the seabed. The fresh-groundwater recharged by present-rainwater existed only in upperpart of alluvium. Water salinization in deep aquifer was caused by the diffusion processbetween palaeo-fresh water and palaeo-seawater. Verification between groundwater age andgeological age is necessary in the future.REFERENCESHathaway, J.C., W.P.P.C. Valentine, R.E. Miller, D.M. Schultz, & F.T. Manheim, 1979. U. S. Geological SurveyCore Drilling on the Atlantic Shelf. Science, 206 (4418), pp515-527HRISE, 2007. Heisei17year. Annual working papers, pp258. (in Japanese)Maekawa, T., Igari, S & Kaneko, N. 2006. Chemical and isotopic compositions of brines fromdissolved-in-water type natural gas fields in Chiba,Japan. Geochemical Journal, 40. 475-484.76
22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesEVALUATION OF SALINISATION PROCESSES THROUGH ISOTOPICANALYSIS AND HYDROCHEMISTRY OF THE AQUIFER KARST SALITRE, THESTATE OF BAHIA, BRAZILTereza Cristina Bittencourt Nossa 1 ; Luiz Rogério Bastos Leal 2 & Maria do Rosário Zucchi 3& Antônio Expedito Gomes de Azevedo 41Htereza.nossa@cprm.gov.brH - 1 Serviço Geológico do Brasil (CPRM);2,3,4 Universidade Federal da Bahia (UFBA) .1 Av. Ulysses Guimarães, 2862, CAB. CEP: 41.213-000. Salvador-BA. Brasil.Abstract - The study area is located in the microregion of Irecê, located in the north centralpart of Bahia state, including a pilot area of the karst aquifer Salitre, defined in themunicipalities of Irecê and Lapão, part of the hydrogeological basin of the Green river andAlligator river. It makes up a total area of approximately 250km², consisting ofNeoproterozoic carbonate rocks of the Salitre Formation. This geological unit is the karstaquifer Salitre, which is the main source of water for irrigation purposes. A risk assessmentof salinization and sodification was carried out by a study of groundwater quality used forirrigation, with analysis of 40 physical-chemical parameters and isotope characterizationthrough deuterium, excess of deuterium, oxygen-18 and dissolved inorganic carbon (D, d, 18 O, 13 C CID ) in water samples collected from wells in the Salitre aquifer. Samples collectedin the eastern sector of the area, upstream, have a lower isotopic enrichment than thoseobtained from wells located in the area north-northwest, downstream flow, which showedhigher isotopic oxygen-18 ( 18 O) and deuterium (D) values, demonstrating that more wateris evaporated and subjected to interactions with the limestone throughout time. Theincreasing values of dissolved inorganic carbon ( 13 C CID ) highlight the fact that the isotopicenrichment occurs preferentially in the E-W direction, consistent with preferential flowdirections obtained in the area. The analyses of the water used for irrigation purposesshowed that in both periods of 89% of water samples are brackish and 11% saline. Coupledwith this, 89% of the groundwater analyzed were classified as C 3 S 1 , can normally be used forirrigation and only 11% of the samples were classified as C 4 S 1 , which are water should not beused for irrigation according to the danger salinization of soils.Keywords: hydrochemistry, isotopic analysis, water quality for irrigation, karst aquifer.77
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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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SUMMARYKeynote Lectures pg 13Coasta
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Groundwater hypersalinization in a
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Hydrostratigraphic Study of Itaipua
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Keynote Lectures
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GROUNDWATER ARTIFICIAL RECHARGE IN
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2. GEOLOGICAL SETTING 3. H
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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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1,61,41,210,80,60,40,20H-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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