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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectiveswas performed by switching every second recharge drip to another color. Hence, it waspossible to investigate distinct freshwater flow paths, which were also revealed to remain incontact with the outflow zones at all times. Moreover, we were able to measure different flowvelocities of freshwater migrating from the surface through the lens to the outflow zones by acombination of the previously described spatial and temporal tracer color variations.Measuring the time and flow path length of a triple point to travel from the top of the island tothe outflow zone, we determined flow velocities that differed of at least a factor of ten,depending on the start location. It must be mentioned that observation accuracy in ourphysical model is the dominant limiting factor, which might be improved in future byincreasing the amount of recharge drips. Flow paths and travel times find their practicalapplication in the delineation of protection zones, e.g. the 50-day zone, which is intended toprevent fecal bacteria from entering a well.Fig. 2: Visualization of age stratification by temporal variation of different tracer colors(uranine, indigotine, eosine) in recharge waters.REFERENCESChesnaux, R., Allen, D.M., 2008. Groundwater travel times for unconfined island aquifersbounded by freshwater or seawater. Hydrogeology Journal, vol. 16, pp. 437–445.Diersch, H.-J.G., 2005. FEFLOW: Finite element subsurface flow and transport simulationsystem. WASY GmbH Institute for Water Resources Planning and Systems Research,Berlin, 292 p.Fetter, C.W., 1972. Position of the saline water interface beneath oceanic islands. WaterResources Research, vol. 8, pp. 1307-1314.222
22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesA PRECAUTIONARY NOTE ON THE INTERPRETATION OF COASTALAQUIFER WATER LEVEL TRENDS AND WATER BALANCESMORGAN, Leanne Kaye; WERNER, Adrian D.; SIMMONS, C. T.leanne.morgan@flinders.edu.auFLINDERS UNIVERSITYGPO Box 2100, Adelaide SA AUSTRALIA 5001, Rm 237 Earth Sciences BuildingAbstract. A precautionary note on the interpretation of coastal aquifer water level trends andwater balances Leanne K. Morgan1,2*, Adrian D. Werner1,2, Craig T. Simmons1,21National Centre for Groundwater Research and Training, Flinders University, GPO Box2100, Adelaide, SA 5001, Australia. 2School of the Environment, Flinders University,Adelaide, Australia. *Corresponding author Abstract In many cases, seawater intrusioninducedinterface movements and associated changes in seawater volume are not consideredin coastal aquifer management studies. The conditions under which this simplified approachmay result in incorrect estimates of freshwater volumes and flawed interpretations of waterlevel trend analyses are not well understood. We address this gap using a simple steady-state,sharp-interface, analytic modelling approach to generate idealised relationships betweenseawater volume, freshwater volume and water levels. The results demonstrate that seawatervolume changes impart significant influence on water level trends within coastal aquiferswhen compared to the corresponding non-coastal aquifer situation, particularly within deepaquifers with high hydraulic conductivity and low net recharge. Changes in seawater volume(over an assumed timescale) were found to be significant relative to freshwater discharge tothe sea for a number of cases, especially within deep aquifers with low hydraulic conductivity,low net recharge and low water levels, at least for the idealised conditions of the analysis.These results highlight the importance of considering changes in seawater volumes withincoastal aquifer water balances. The results also demonstrate that temporal trends in coastalaquifer water levels may not provide an adequate measure of freshwater storage trends, andrather, rapid assessment of coastal aquifer condition should consider groundwater levelsrelative to the hydraulic forcing of the ocean using an appropriate equivalent freshwater headfor the ocean boundary condition. The analytic solution used for this study involves anassumption of quasi-equilibrium conditions between the water table and interface. Thisassumption was evaluated using a selection of transient simulations, and preliminary resultswill be presented.Keywords: coastal aquifer; water balances; water level trends223
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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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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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