Rainfall infiltration‐derived submarine groundwater discharge from multi‐layered aquifer system terminating at the coastline

Guo, Qiaona; Li, Hailong; Zhou, Zhifang; Huang, Yong

doi:10.1002/hyp.8188

Cited by 10 publications

(6 citation statements)

References 57 publications

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“…Near the shoreline, fluctuations in water level due to rainfall recharge can be of limited relevance because of the dampening effect of an oscillating sea level; in general the influence of recharge in confined or multilayer aquifers depends on the specific leakage and transmissivity ratio of the aquifer (Guo et al 2012). In contrast, variation in atmospheric pressure over the sea surface has a substantial effect on hydraulic head, characterised by an inverse relationship between air pressure and water level.…”

Section: Introductionmentioning

confidence: 99%

Processes Influencing Groundwater Level and the Freshwater-Saltwater Interface in a Coastal Aquifer

Vallejos

Sola

Pulido−Bosch

2014

Water Resour Manage

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Few studies have focused on the relationship between the various causes of groundwater level fluctuations and the seawater intrusion process, due to the complexity of this relationship, being the aim of this paper. Piezometric fluctuations in coastal aquifers are determined by a number of processes and their characterization depends on the complexity of the aquifer stratigraphy, as well as many other hydrodynamic factors. The precipitation regime, tides, wave setup and storm surges, as well as atmospheric pressure are the most relevant of these processes. By means of a series of observations made at an experimental site in south-eastern Spain, this study demonstrates the complexity of water table fluctuations in coastal zones. The study employed two piezometers situated very close to the shoreline, excavated in detritic deposits with highly variable hydraulic conductivity (semi-confined aquifer). Continuous measurements were taken of hydraulic head, tide height, electrical conductivity and water temperature. The study concludes that precipitation has the greatest effect on piezometric level, followed by atmospheric pressure and wave action, while the semi-diurnal and fortnightly tidal cycles caused variations of smaller amplitude in the piezometric logs. All these oscillations affect the position of the fresh water-seawater interface. The attenuation of the tidal amplitude observed at the two monitoring points was lower than the value calculated using analytical solutions, and this is due to the semi-confined nature of the aquifer. The calculated tidal efficiency is around 0.4-0.5, giving a t lag of about 3 h, with a 10-15 min delay between monitoring boreholes, P-II and PI. We also identified that the response of water conductivity and temperature to tidal cycles is not synchronized with the variations in the piezometric level influenced by tidal fluctuations.

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Section: Introductionmentioning

confidence: 99%

Processes Influencing Groundwater Level and the Freshwater-Saltwater Interface in a Coastal Aquifer

Vallejos

Sola

Pulido−Bosch

2014

Water Resour Manage

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“…Coastal aquifers usually have a heterogeneous structure, often with horizontal layers of different permeability Jiao, 2001a, b, 2003;Rao et al, 2005;Guo et al, 2007Guo et al, , 2012Kim et al, 2012). Improved understanding of flow and transport in such aquifers would aid in protection of coastal groundwater resources and marine ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Influence of a coarse interlayer on seawater intrusion and contaminant migration in coastal aquifers

Liu

Mao

Chen

et al. 2013

Hydrological Processes

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Vertical 2D slice laboratory experiments were carried out in homogenous and layered sand tanks to elucidate the effects of a highly permeable (coarse‐grained sand) interlayer on seawater intrusion and transport of contaminants to a coastal sea. Tidal fluctuations produced oscillations in the seawater–freshwater transition zone, fluctuations of the contaminant infiltration rate and a zigzag contaminant plume outline. The seawater wedge became discontinuous at the (vertical) edges of the interlayer because of increased lateral movement of the seawater–freshwater interface within the interlayer. The contaminant plume formed a tail within the interlayer depending on the tidal stage, and similar to the wedge, its movement was accentuated. A simple analytical model that neglected vertical flow reliably predicted steady‐state seawater intrusion into the coastal aquifer. Numerical modeling was used to gain insight into the groundwater hydrodynamics and contaminant migration. The numerical results confirmed the experimental findings, i.e. that a highly permeable interlayer can provide a rapid transit path for contaminants to reach the seaward boundary and that the interlayer amplifies the effects of tidal fluctuations, resulting in wider transition zones for the seawater wedge and contaminant plume. Numerical simulations further showed that, with increasing interlayer hydraulic conductivity, the maximum seawater intrusion distance inside the interlayer increases approximately linearly. For the fixed‐head contaminant injection condition used, the model showed that contaminant infiltration increases approximately logarithmically with increasing interlayer hydraulic conductivity (other factors held fixed). Copyright © 2013 John Wiley & Sons, Ltd.

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“…This assumption is necessary for analytical study and has been widely used in existing analytical studies of coastal aquifers (e.g. Chuang and Yeh, 2007;Guo et al, 2007Guo et al, , 2012Jeng et al, 2002Jeng et al, , 2005Li and Chen, 1991;Li and Jiao, 2001a,2001bLi et al, 2007aLi et al, ,2007bLi et al, , 2008aXia et al, 2007). There are a number of useful and important cases where this assumption is valid or approximately valid, which include, e.g.…”

Section: Mathematical Modelmentioning

confidence: 99%

Terrestrial-originated submarine groundwater discharge through deep multilayered aquifer systems beneath the seafloor

Guo

2014

Hydrol. Process.

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Abstract:A large quantity of submarine groundwater discharge (SGD) of about 1000 m 3 day À1 m À1 of the 600-km-long shoreline of South Atlantic Bight has been estimated by Moore (Global Biogeochemical Cycles, 2010b, 24, GB4005, doi:10.1029. However, there is great uncertainty in estimating the percentage of net, land-originated groundwater recharge of SGD. Moreover, most previous studies considered the homogeneous case for the coastal superficial aquifers. Here, we investigated the terrestrial-originated SGD through a multilayered submarine aquifer system, which comprises two confined aquifers and two semi-permeable layers. The inland recharge includes a constant part representing the annual average and a periodical part representing its seasonal variation. An analytical solution was derived and used to analyse the distributions of the terrestrial-originated SGD from the multilayered aquifers along the Winyah Bay transect, South Atlantic Bight. It is found that the width of the zone of SGD from the upper aquifer ranges from 0.8 to~8.0 km depending on the leakance of the seabed semi-permeable layer. A head of the upper aquifer at a coastline 1.0 m higher than the mean sea level will cause a SGD of 1.82-18.3 m 3 day À1 m À1 from that aquifer as the seabed semi-permeable layer's leakance varies from 0.001 to 0.1 day

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Rainfall infiltration‐derived submarine groundwater discharge from multi‐layered aquifer system terminating at the coastline

Cited by 10 publications

References 57 publications

Processes Influencing Groundwater Level and the Freshwater-Saltwater Interface in a Coastal Aquifer

Processes Influencing Groundwater Level and the Freshwater-Saltwater Interface in a Coastal Aquifer

Influence of a coarse interlayer on seawater intrusion and contaminant migration in coastal aquifers

Terrestrial-originated submarine groundwater discharge through deep multilayered aquifer systems beneath the seafloor

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