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Llopis-Albert, C.; Merigó, J.M.; Xu, Y. |
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A coupled stochastic inverse/sharp interface seawater intrusion approach for coastal aquifers under groundwater parameter uncertainty |
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2016 |
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Journal of Hydrology |
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540 |
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774-783 |
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This paper presents an alternative approach to deal with seawater intrusion problems, that overcomes some of the limitations of previous works, by coupling the well-known SWI2 package for MODFLOW with a stochastic inverse model named GC method. On the one hand, the SWI2 allows a vertically integrated variable-density groundwater flow and seawater intrusion in coastal multi-aquifer systems, and a reduction in number of required model cells and the elimination of the need to solve the advective-dispersive transport equation, which leads to substantial model run-time savings. On the other hand, the GC method allows dealing with groundwater parameter uncertainty by constraining stochastic simulations to flow and mass transport data (i.e., hydraulic conductivity, freshwater heads, saltwater concentrations and travel times) and also to secondary information obtained from expert judgment or geophysical surveys, thus reducing uncertainty and increasing reliability in meeting the environmental standards. The methodology has been successfully applied to a transient movement of the freshwater-seawater interface in response to changing freshwater inflow in a two-aquifer coastal aquifer system, where an uncertainty assessment has been carried out by means of Monte Carlo simulation techniques. The approach also allows partially overcoming the neglected diffusion and dispersion processes after the conditioning process since the uncertainty is reduced and results are closer to available data. |
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0022-1694 |
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THL @ christoph.kuells @ Llopis-Albert2016 |
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30 |
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Sebben, M.L.; Werner, A.D.; Graf, T. |
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Title |
Seawater intrusion in fractured coastal aquifers: A preliminary numerical investigation using a fractured Henry problem |
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2015 |
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Advances in Water Resources |
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85 |
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93-108 |
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Despite that fractured coastal aquifers are widespread, the influence of fracture characteristics on seawater intrusion (SWI) has not been explored in previous studies. This research uses numerical modelling in a first step towards understanding the influence of fracture orientation, location and density on the extent of seawater and accompanying patterns of groundwater discharge in an idealised coastal aquifer. Specifically, aquifers containing single fractures or networks of regularly spaced fractures are studied using modified forms of the Henry SWI benchmark problem. The applicability of equivalent porous media (EPM) models for representing simple fracture networks in steady-state simulations of SWI is tested. The results indicate that the influence of fractures on SWI is likely to be mixed, ranging from enhancement to reduction in seawater extent and the width of the mixing zone. For the conceptual models considered here, vertical fractures in contact with the seawater wedge increase the width of the mixing zone, whereas vertical fractures inland of the wedge have minimal impact on the seawater distribution. Horizontal fractures in the lower part of the aquifer force the wedge seaward, whereas horizontal fractures located within the zone of freshwater discharge enhance the wedge. Inclined fractures roughly parallel to the seawater-freshwater interface increase the landward extent of seawater and fractures perpendicular to the interface inhibit the wedge. The results show that EPM models are likely inadequate for inferring salinity distributions in most of the fractured cases, although the EPM approach may be suitable for orthogonal fracture networks if fracture density is high and appropriate dispersivity values can be determined. |
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0309-1708 |
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THL @ christoph.kuells @ Sebben2015 |
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37 |
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Shyu*, G.; Cheng, B.; Chiang, C.; Yao, P.; Chang, T. |
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Applying factor analysis combined with kriging and information entropy theory for mapping and evaluating the stability of groundwater quality variation in Taiwan |
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2011 |
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Int. J. Environ. Res. Public Health |
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8 |
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1084-1109 |
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CUT @ phaedon.kyriakidis @ Shyu2011 |
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123 |
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Xu, J.; Li, W.; Hong, Y.; Wei, C.; Tang, J. |
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A quantitative assessment on groundwater salinization in the Tarim River lower reaches, Northwest China |
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2014 |
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Sci. Cold Arid. Reg. |
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6(1) |
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44-51 |
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CUT @ phaedon.kyriakidis @ Xu2014 |
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126 |
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Mehrjardi, R.T.; Jahromi, M.Z.; Mahmodi, S.; Heidari, A. |
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Spatial distribution of groundwater quality with geostatistics (Case Study: Yazd-Ardakan Plain) |
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2008 |
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World Appl. Sci. J. |
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4(1) |
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9-17 |
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1818-4952 |
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CUT @ phaedon.kyriakidis @ Mehrjardi2008 |
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131 |
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