2020
DOI: 10.1002/hyp.13863
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Investigation of the elevation of saltwater wedge due to subsurface dams

Abstract: Subsurface dams are rather effective and used for the prevention of saltwater intrusion in coastal regions around the world. We carried out the laboratory experiments to investigate the elevation of saltwater wedge after the construction of subsurface dams. The elevation of saltwater wedge refers to the upward movement of the downstream saltwater wedge because the subsurface dams obstruct the regional groundwater flow and reduce the freshwater discharge. Consequently, the saltwater wedge cannot further extend … Show more

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Cited by 25 publications
(8 citation statements)
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“…The subsurface dam was widely used to mitigate SWI, and normally it should be taller than the thickness of saltwater wedge at a specified position (Chang et al., 2019, 2020; Zhang et al., 2019). The thickness of saltwater wedge can be determined with field monitoring wells as well as experimental and numerical modeling methods (Abdoulhalik & Ahmed, 2017a, 2017b; Chang et al., 2019).…”
Section: Resultsmentioning
confidence: 99%
“…The subsurface dam was widely used to mitigate SWI, and normally it should be taller than the thickness of saltwater wedge at a specified position (Chang et al., 2019, 2020; Zhang et al., 2019). The thickness of saltwater wedge can be determined with field monitoring wells as well as experimental and numerical modeling methods (Abdoulhalik & Ahmed, 2017a, 2017b; Chang et al., 2019).…”
Section: Resultsmentioning
confidence: 99%
“…The seawater was prepared by dissolving 34.5 g of sodium chloride (NaCl, AR grade) and 1.5 g of red food dye (Sinopharm Chemical Reagent, Co., Ltd) per liter of deionized water. Previous studies have examined that food dyes can permeate synchronously with saltwater in a sand flume and have an inert relationship (adsorption and reaction) with the porous medium (Chang et al, 2019(Chang et al, , 2020Goswami & Clement, 2007). The seawater and freshwater densities were measured using a densitometer (AlfaMirage SD-200L) to be 1.025 g/mL and 1.0 g/mL, respectively.…”
Section: Methodsmentioning
confidence: 99%
“…In the model, the isoline of 50% seawater salinity was located by visualizing the 18 000 mg/L isoline. While in the experiment, the 50% isoline was located by directly observing the shape of the saltwater wedge (Chang et al, 2020; Luyun Jr. et al, 2011). In order to reduce the error caused by this method, the experimental conditions should be kept stable and the angle should be consistent when observing the position of the saltwater wedge toe.…”
Section: Methodsmentioning
confidence: 99%
“…The average hydraulic conductivity (K) of the porous media measured by Darcy's law was 0.0048 m/s and the porosity (n) measured by the volume method was 0.4. The longitudinal dispersivity (α L ) of porous media obtained by fitting the breakthrough curves in an onedimensional column experiment was 0.15 cm, which represents a value common for laboratory-scale experiments (Chang et al, 2020;Sun et al, 2019). The transverse dispersivity (α T ) was set to be 1/10 of the longitudinal dispersivity, as same as the previous studies (Lu et al, 2013;Luyun Jr. et al, 2011;Walther et al, 2017).…”
Section: Experimental Methodsmentioning
confidence: 99%
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