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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectives4. DISCUSSION AND CONCLUSIONSThese simulation results indicate that freshgroundwater occurs on the continental margindue to sea level fluctuations and thisgroundwater is washed out with each cycle.Transient boundary condition is also betterthan static boundary condition for evaluationof the current distribution of the groundwaterflow under the seabed. In addition, thissimulation method to evaluate groundwaterflow system under the seabed contributeseffectively research plan such as offshoreboring, electromagnetic investigation tounderstand the processes at ocean / continentboundaries. Future plan is to understand thelocal characteristics related to the volume ofgroundwater under the seabed and toconstruct the temporal-spatial map ofgroundwater under the seabed over JapanIsland.REFERENCES(1)(2)Depth(km)(3)Depth(km)(4)Depth(km)0-0.5-1.0-1.50-0.5-1.0-1.50-0.5-1.0-1.5505050606060X(km)X(km)X(km)70708080Velocity(m/year)0.208686C/C 01.000.750.500.250.000.150.100.050.00Age(ky)240Figure 3. Cross-sectional distribution map ofspecific resistivity (1) and salt concentration(2) and velocity (3) and groundwater age (4).708086180120600Goode, D. J., 1996. Direct simulation of groundwater age. Water Resources Research, vol. 32,n. 2, pp. 289–296.Guo, W., & Langevin, C. D., 2002. User’s Guide to SEAWAT: A Computer Program forSimulation of Three-Dimensional Variable-Density Ground-Water Flow. U.S. GeologicalSurvey Open-File Report 01-434.Ito, N., M. Koshigai, A. Marui, 2010. Preliminary model for simulation of groundwater flowand seawater / freshwater interface at coastal area of Horonobe, Hokkaido. Journal ofGroundwater Hydrology, vol. 52, n. 4, pp. 381-394.Japan Nuclear Cycle Development Institute (JNC), 2005. “H17: Development andManagement of the Technical Knowledge Base for the Geological Disposal of HLW”,Supporting Report 1: Geoscience study. JNC TN1400 2005-014. (in Japanese)Uchida, T., 2011. Development of electromagnetic exploration for shallow sea area. AISTToday, vol.11, n.10, pp. 22-22.244
22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesREACTIVE PORE-SCALE MODELING OF SEAWATER-FRESH WATERMIXING INTERFACERAOOF, Amir; SCHOTTING R. J., HASSANIZADEH S. M.a.raoof@uu.nlUTRECHT UNIVERSITYBudapestlaan 4, 3584 CD, Utrecht, The NetherlandsAbstract. Pore scale mixing is a key process controlling the chemistry of groundwater. Poresize heterogeneities and pore connections define the degree of transverse mixing. Thequantification of such mixing and its effects on the fate of chemicals in coastal waters are stillthe subject of debate. In this study, we examine the coupling between solute transport andreaction processes to investigate nutrient transport near a hypothetical interface betweenintruding seawater and fresh groundwater. We use a Multi-Directional Pore Network(MDPN) model to study the effect of pore scale heterogeneities on mixing between fluids withdifferent concentrations. Using MDPN we discretize the continuum porous structure as anetwork of pore bodies and pore throats orientated along various directions in 3D domains.This topological property, together with a geometrical distribution of pore sizes, enables themicrostructure of porous media to be mimicked. For each pore element, transport of solute iscalculated by solving the governing mass balance equations. Chemical reactions areincorporated through coupling with a biogeochemical reactive network simulator. Averagevalues and properties are obtained by integration over a large number of pores. Results fromthis study contribute to a better understanding of the coupling and interplay between masstransfer and reaction rates based on the pore scale information. The results showed how porescale velocity together with transversal diffusion affects the reactive mixing zone width andextends it along the main flow path.Keywords: pore scale, reaction, mixing245
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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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22 nd Salt Water Intrusion Meeting:
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Effects of sea levelrise and climat
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Hans Sulzbacher 1 ; Helga Wiederhol
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Resistivity [Ωm]0.1 1 10 100 10000
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2. METHODS Figure 1a.
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4. DISCUSSION AND CONCLUSIONSREFERE
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METHODS 51
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DISCUSSION AND CONCLUSIONS
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2. RESULTS, HOW TO GET THERE AND WH
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STUDY OF THE SALTWATER-FRESHWATER I
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4. DISCUSSION5. CONCLUSIONS67
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Hydrogeochemical and isotopicmethod
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Figure 1 Location map of study area
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Therefore, it was clarified that th
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GROUNDWATER HYPERSALINIZATION IN A
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3. RESULTS AND DISCUSSIONS
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GROUNDWATER ARTIFICIAL RECHARGE IN
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Figure 2: The modeled interface dep
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