Chemical and isotopic constraints on evolution of groundwater salinization in the coastal plain aquifer of Laizhou Bay, China

Han, Dongmei; Song, Xinshan; Currell, Matthew; Yang, Jilong; Xiao, Guoqiao

doi:10.1016/j.jhydrol.2013.10.040

Cited by 193 publications

(119 citation statements)

References 25 publications

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“…Indeed, even if saltwater intrusion is a common problem for coastal aquifers (Chandrasekar et al, 2014;Han et al, 2014), and moreover in Mediterranean context (Petalas and Lambrakis, 2006;Sivan et al, 2005), no seawater intrusion is detected yet and the aquifer seems to be still protected from over abstraction despite an ever increasing pressure. It is nevertheless necessary to identify and quantify the different components of the local water balance to accurately evaluate the potential of the aquifer as a sustainable water resource in a semi-arid context.…”

Section: Aquifer Hydraulic Conductivity Estimations and Residence Timmentioning

confidence: 99%

“…CFCs may be affected by the transfer processes in the unsaturated zone, local contaminations and degradation processes in anoxic environments causing most of the time offsets to groundwater aging (Aeschbach-Hertig et al, 1998;Beyerle et al, 1999;Gooddy et al, 2006;Gourcy et al, 2009;Heaton and Vogel, 1981;Schwientek et al, 2009). SF 6 is considered as a conservative tracer, but natural sources have been highlighted in granitic environments and some carbonates aquifers (Han et al, 2014;Harnisch and Eisenhauer, 1998;Harnisch et al, 2000). As a consequence, it appears difficult to employ CFCs and SF 6 as groundwater dating tracers in presence of thick unsaturated zone, particularly if aquifers are hydraulically connected to granitic environments.…”

Section: Introductionmentioning

confidence: 99%

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Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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Section: Aquifer Hydraulic Conductivity Estimations and Residence Timmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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“…The saturation indices (SI) are used to identify the hydrochemical processes using PHREEQC version 2.8 for Windows (Parkhurst and Appelo 1999;Han et al 2014).…”

Section: Methodsmentioning

confidence: 99%

“…The soil texture in the unsaturated zone is mainly composed of clay silt and sandy silt, with a loose structure resulting in more permeability, which makes the infiltration (i.e., recharge) and evapotranspiration (i.e., discharge) prone to occur in the vertical direction. Groundwater dynamics in the deep confined aquifer is influenced by climatic and hydrogeological conditions, and particularly the volumes of groundwater exploitation for salt production (Han et al 2014;Kreuzer et al 2009). The original salty groundwater has not been suitable for drinking, irrigation, or industrial purposes; therefore, transfer of water from the Yellow River has and will continue to meet domestic, industrial, and agricultural water needs.…”

Section: Study Area Descriptionmentioning

confidence: 99%

Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China

Liu

et al. 2016

Environ Earth Sci

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This paper aims to improve the current knowledge of groundwater salinization processes of a young coastal aquifer in the Yellow River Delta (YRD) and to assess the impact of both the transfer of irrigation water from the Yellow River and seawater intrusion, using a combination of hydrochemical-isotopic measurements. The major ion/Cl -ratios generally closely follow the mixing line between freshwater end-member (the Yellow River) and saline water end-members (salt groundwater or seawater), indicating the importance of mixing under natural and anthropogenic influences. The examination of stable isotope in groundwater (ranging from -9.0 to -3.5 % for d18 O and from -73 to -29 % for dD, respectively) and chloride concentrations (*2 to 629 meq/ L) confirms that the saline end-member is associated with saltwater rather than present seawater, and most groundwater samples are plotted on mixing lines between the Yellow River and saltwater. The similar range in stable isotopes (d 18 O and dD) and Cl -compositions between saltwater and confined aquifer supports the hypothesis that upward seepage of confined saline water intruded the shallow aquifer. Moreover, the deviations in some cases from mixing line imply water-rock interaction is also important in dominant control on groundwater chemistry, such as cation exchange, SO 4 2-reduction, and NaCl solution. The brackish water was characterized by slight excess of Na ? and deficit of Ca 2? compared to nonreactive mixing line. This indicates that the coastal aquifer is generally freshening with respect to extensive irrigation network, as well as the transfer from the Yellow River for ecological recharge into wetland.

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“…Although salinization of coastal aquifers is mostly due to seawater intrusion, there are other factors that affect the quality of groundwater that are related to geochemical processes and anthropogenic impacts, and hence the importance to differentiate the sources of salinization and behavior of the aquifer in order to reduce & J. Mahlknecht jurgen@itesm.mx vulnerability of the aquifer (Han et al 2014;Kaplan and Muñoz-Carpena 2014). At least 15 Mexican coastal aquifers are affected by saltwater intrusion; almost all of them are located in the desert northwestern portion of the country (Baja California and Sonora) (CONAGUA 2014).…”

Section: Introductionmentioning

confidence: 99%

Isotope signatures and hydrochemistry as tools in assessing groundwater occurrence and dynamics in a coastal arid aquifer

et al. 2016

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Groundwater from the La Paz arid coastal aquifer in Baja California, Mexico, is essentially the only source of drinking water for the local population and tourists, as well as irrigation water for agricultural needs. The intensive exploitation of the aquifer and water cycling has resulted in groundwater abatement (up to 10 m) and high salinity (up to *5800 mg l -1 ). A study using hydrochemistry, isotopic (deuterium, oxygen-18 and carbon-14) and gaseous tracers (chlorofluorocarbons CFC-11, CFC-12, CFC-113), as well as multivariate statistics, was developed to elucidate groundwater composition, flow and occurrence. Groundwater is of meteoric origin, and a large proportion is subject to evaporation. The primary natural recharge is generated in the El Novillo and Las Cruces ranges, and groundwater subsequently flows in a SE-NW direction toward the coast. The initial water type is the result of discordant dissolution of silicate minerals and ion exchange on soils. In the lower plain portion, the aquifer system is recharged from irrigation return flow and seawater intrusion, which significantly affects groundwater chemistry. Nitrate and chloride concentrations indicate that groundwater is highly affected by an overuse of fertilizers in agricultural activities, but there is little effect from urban activities. Seawater intrusion has progressed rapidly during the past decade, and the impact currently extends 13 km inland. Radiocarbon residence time calculations suggest that groundwater is modern, with the exception of Chametla and El Centerario sites in the central and western lowlands with ages of up to *5000 years. These waters indicate an additional recharge source for the upconing of fossil groundwater or regional flow.

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Chemical and isotopic constraints on evolution of groundwater salinization in the coastal plain aquifer of Laizhou Bay, China

Cited by 193 publications

References 25 publications

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China

Isotope signatures and hydrochemistry as tools in assessing groundwater occurrence and dynamics in a coastal arid aquifer

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