Perfiles de concentración del cloruro reconstruidos debajo del lecho marino en Hong Kong (China) y sus implicancias en los recursos de agua subterránea mar adentro

Jiao, Jiu Jimmy; Shi, Lei; Kuang, Xingxing; Lee, Chun Ming; Yim, Wyss W. -S.; Yang, Shouye

doi:10.1007/s10040-014-1201-6

Cited by 38 publications

(31 citation statements)

References 27 publications

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“…Sedimentation is actually a moving boundary problem with the moving rate being equal to the sedimentation rate. It was simulated by successively adding blocks to the existing sediment column (Paul et al, 2001;Schrag et al, 2002;Beekman et al, 2011;Jiao et al, 2015). In the numerical model, a block with thickness equal to Δz was added to the model when the product of sedimentation rate and simulation time equals to Δz, which is calculated as the following:…”

Section: Numerical Modelmentioning

confidence: 99%

“…In numerical studies, sedimentation has been incorporated into several numerical models to reconstruct the observed Cl − concentration profiles (Beekman, ; Beekman et al ., ; Tokunaga et al ., ; Jiao et al ., ). Beekman () and Beekman et al .…”

Section: Introductionmentioning

confidence: 99%

“…In numerical studies, sedimentation has been incorporated into several numerical models to reconstruct the observed Cl À concentration profiles (Beekman, 1991;Beekman et al, 2011;Tokunaga et al, 2011;Jiao et al, 2015). Beekman (1991) and Beekman et al (2011) developed the numerical model EMSD (Erosion-Mixing-Sedimentation-Diffusion) to simulate the evolution of Cl À concentration profiles.…”

Section: Introductionmentioning

confidence: 99%

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Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China

2015

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Abstract:Sedimentation may have a significant effect on the transport of solutes and environmental isotopes in sediment. The depth profiles of the Cl À , δ 2 H and δ 18 O in a borehole in the aquifer-aquitard system in the Pearl River Delta (PRD), China, were obtained by centrifuging the core sediment samples. A one-dimensional model based on the sedimentation and sea level changes of the PRD during the Holocene was built to investigate numerically the transport mechanisms of Cl À , δ 2 H and δ 18O. The sedimentation process was modelled as a moving boundary problem with the moving rate equal to the sedimentation rate. The model was calibrated and the parameters were obtained by comparing simulated and measured data. Very good agreement between all the three observed profiles and the simulated ones demonstrates the reliability of the model and the parameters. Simulation results show that the shapes of the curves are controlled by the combination of sedimentation and upper boundary conditions. Diffusion solely is adequate to reconstruct the observed profiles, which indicates that diffusion is the dominant vertical transport mechanism. The effective diffusion coefficients of the aquitard and the aquifer equal to 5.0 × 10 À11 and 2.0 × 10 À10 m 2 /s, respectively. The results of this study will help in understanding the transport mechanisms of solutes and environmental tracers in deltas with geology and hydrogeology similar to the PRD.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China

2015

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“…Freshened groundwater has been detected tens to hundreds of kilometers offshore of coastlines worldwide (Post et al, ), and simulations indicate that this could be common across a range of geologic systems (Michael et al, ). Offshore groundwater resources can potentially be exploited for uses such as drinking, agriculture, and oil recovery (Bakken et al, ; Jiao et al, ; Kwong et al, ; Person et al, ; Ziegler et al, ). Since the late nineteenth century, considerable effort has gone into understanding coastal aquifer systems for effective management to avoid seawater intrusion (e.g., Reilly & Goodman, ; Werner et al, ), but the onshore impacts of offshore pumping have not yet been fully assessed.…”

Section: Introductionmentioning

confidence: 99%

Offshore Pumping Impacts Onshore Groundwater Resources and Land Subsidence

Michael

2019

Geophysical Research Letters

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Freshened groundwater exists offshore along many coastlines worldwide. Pumping of these offshore resources has been proposed for more efficient oil production as well as drinking and agriculture. Although pumping can occur tens to hundreds of kilometers offshore, these activities may threaten connected onshore aquifer systems. We conducted numerical simulations of variable‐density groundwater flow and salt transport in coastal aquifers with different geologic structure subject to offshore pumping to assess potential impacts. Results show that offshore pumping can diminish both onshore groundwater availability and submarine groundwater discharge and can cause widespread land subsidence. Heterogeneity increases water resource vulnerability relative to equivalent homogeneous and layered systems and exacerbates the magnitude of land subsidence. More continuous geologic structure causes propagation of maximum subsidence farther landward. This work suggests that coastal aquifers may be vulnerable to offshore pumping activities and that these effects should be considered in feasibility assessments for offshore drilling.

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“…Very steep Cl À gradients in marine sediments pore waters have only been observed in nearshore environments where submarine groundwater discharge is active (Jiao et al, 2015;Oehler et al, 2017;Schlüter et al, 2004;Tokunaga et al, 2011). Very steep Cl À gradients in marine sediments pore waters have only been observed in nearshore environments where submarine groundwater discharge is active (Jiao et al, 2015;Oehler et al, 2017;Schlüter et al, 2004;Tokunaga et al, 2011).…”

Section: Freshwaters Contributions To the Upper Continental Slopementioning

confidence: 99%

Freshwater Seepage Into Sediments of the Shelf, Shelf Edge, and Continental Slope of the Canadian Beaufort Sea

Gwiazda

Paull

Dallimore

et al. 2018

Geochem Geophys Geosyst

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Long‐term warming of the continental shelf of the Canadian Beaufort Sea caused by the transgression associated with the last deglaciation may be causing decomposition of relict offshore subsea permafrost and gas hydrates. To evaluate this possibility, pore waters from 118 sediment cores up to 7.3‐m long were taken on the shelf and slope and analyzed for chloride concentrations and δ180 and δD composition. We observed downcore decreases in pore waters Cl− concentration in sediments from all sites from the inner shelf (<20‐m water depth), from the shelf edge, from the outer slope (down to 1,000‐m water depths), and from localized shelf features such as midshelf pingo‐like features and inner shelf pockmarks. In contrast, pore water freshening is absent from all investigated cores of the Mackenzie Trough. Downcore pore waters Cl− concentration decreases indicate regional widespread freshwater seepage. Extrapolations to zero Cl− of pore water Cl− versus δ180 regression lines indicate that freshwaters in these environments carry different isotope signatures and thus are sourced from different reservoirs. These isotopic signatures indicate that freshening of shelf sediments pore waters is a result of downward infiltration of Mackenzie River water, freshening of shelf edge sediments is due to relict submarine permafrost degradation or gas hydrate decomposition under the shelf, and freshening of slope sediments is consistent with regional groundwater flow and submarine groundwater discharge as far as 150 km from shore. These results confirm ongoing decomposition of offshore permafrost and suggest extensive current groundwater discharge far from the coast.

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Perfiles de concentración del cloruro reconstruidos debajo del lecho marino en Hong Kong (China) y sus implicancias en los recursos de agua subterránea mar adentro

Cited by 38 publications

References 27 publications

Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China

Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China

Offshore Pumping Impacts Onshore Groundwater Resources and Land Subsidence

Freshwater Seepage Into Sediments of the Shelf, Shelf Edge, and Continental Slope of the Canadian Beaufort Sea

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Perfiles de concentración del cloruro reconstruidos debajo del lecho marino en Hong Kong (China) y sus implicancias en los recursos de agua subterránea mar adentro

Cited by 38 publications

References 27 publications

Numerical studies of vertical Cl−, δ2H and δ18O profiles in the aquifer-aquitard system in the Pearl River Delta, China

Numerical studies of vertical Cl−, δ2H and δ18O profiles in the aquifer-aquitard system in the Pearl River Delta, China

Offshore Pumping Impacts Onshore Groundwater Resources and Land Subsidence

Freshwater Seepage Into Sediments of the Shelf, Shelf Edge, and Continental Slope of the Canadian Beaufort Sea

Contact Info

Product

Resources

About

Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China

Numerical studies of vertical Cl⁻, δ²H and δ¹⁸O profiles in the aquifer-aquitard system in the Pearl River Delta, China