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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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Author |
Huang*, P.; Y.Chiu |
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Title |
A simulation-optimization model for seawater intrusion management at Pingtung Coastal Area, Taiwan |
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Journal Article |
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2018 |
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Water |
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10 |
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251 |
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seawater intrusion; SEAWAT; management model; artificial neural networks; differential evolution; Pingtung Plain; Taiwan |
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The coastal regions of Pingtung Plain in southern Taiwan rely on groundwater as their main source of fresh water for aquaculture, agriculture, domestic, and industrial sectors. The availability of fresh groundwater is threatened by unsustainable groundwater extraction and the over-pumpage leads to the serious problem of seawater intrusion. It is desired to find appropriate management strategies to control groundwater salinity and mitigate seawater intrusion. In this study, a simulation–optimization model has been presented to solve the problem of seawater intrusion along the coastal aquifers in Pingtung Plain and the objective is using injection well barriers and minimizing the total injection rate based on the pre-determined locations of injection barriers. The SEAWAT code is used to simulate the process of seawater intrusion and the surrogate model of artificial neural networks (ANNs) is used to approximate the seawater intrusion (SWI) numerical model to increase the computational efficiency during the optimization process. The heuristic optimization scheme of differential evolution (DE) algorithm is selected to identify the global optimal management solution. Two different management scenarios, one is the injection barriers located along the coast and the other is the injection barrier located at the inland, are considered and the optimized results show that the deployment of injection barriers at the inland is more effective to reduce total dissolved solids (TDS) concentrations and mitigate seawater intrusion than that along the coast. The computational time can be reduced by more than 98% when using ANNs to replace the numerical model and the DE algorithm has been confirmed as a robust optimization scheme to solve groundwater management problems. The proposed framework can identify the most reliable management strategies and provide a reference tool for decision making with regard to seawater intrusion remediation. |
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CUT @ phaedon.kyriakidis @ Huang2018 |
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141 |
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Krige*, D.G. |
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A statistical approach to some basic mine valuation problems on the Witwatersrand |
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1951 |
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Jour. Chem. Metall. and Mining Soc. So. Africa |
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52 (6) |
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119-139 |
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0038-223x |
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CUT @ phaedon.kyriakidis @ Krige1951 |
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157 |
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Hussain*, M.S.; Javadi, A.A.; Asr, A.A.; Farmani, R. |
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A surrogate model for simulation-optimization of aquifer systems subjected to seawater intrusion |
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2015 |
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J. Hydrol. |
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523 |
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542-554 |
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CUT @ phaedon.kyriakidis @ hussain2015 |
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114 |
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Di Lorenzo, T.; Galassi, D.M.P. |
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Agricultural impact on Mediterranean alluvial aquifers: do groundwater communities respond? |
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2013 |
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Fundamental and Applied Limnology/Archiv für Hydrobiologie |
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182 |
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4 |
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271-282 |
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alluvial aquifers, groundwater, stygobiont, nitrate, overexploitation |
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In Mediterranean countries agricultural development heavily depends on groundwater availability due
to arid and semi-arid climate and poor surface-water resources. Agriculture represents one of the most relevant
pressures which generate impacts in alluvial aquifers by means of fertilizers and pesticides usage and groundwater
overexploitation. Until now, very few studies have addressed the ecological response of groundwater fauna to
groundwater contamination and overexploitation due to agricultural practices. We investigated a Mediterranean
alluvial aquifer heavily affected by nitrates contamination and groundwater abstraction stress due to crop irrigation. The aim of this study was to evaluate the sensitivity of groundwater communities to (a) groundwater nitrate
contamination, (b) groundwater abstraction due to irrigation practices, and (c) saltwater intrusion. The present
work suggests that nitrate concentration lower than 150 mg l
–1 is not an immediate threat to groundwater biodiversity in alluvial aquifers. This conclusion must be carefully considered in the light of the total lack of knowledge
of the effects of long-term nitrate pollution on the groundwater biota. Moreover, local extinctions of less tolerant
species, prior to monitoring, cannot be ruled out. Conversely, species abundances in ground water are affected by
groundwater withdrawal, but species richness may be less sensitive. This result is attributable to the disappearance
of saturated microhabitats and to the depletion of fine unconsolidated sediments, reducing the surface available
to bacterial biofilm, which represent the trophic resource for several groundwater invertebrates and where the
main aquifer self-purification processes, such as denitrification, take place. Saltwater intrusion seems not to affect
groundwater species at the values measured in this coastal aquifer. |
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E. Schweizerbart'sche Verlagsbuchhandlung |
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1863-9135 |
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THL @ luqianxue.zhang @ DiLorenzo2013 |
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43 |
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