Groundwater salinization in a subtropical region, Beihai, southern China: Insights from hydrochemistry and multiple isotopes (H, O, S, Sr)

Zhang, Yanpeng; Li, Qinghua; Luo, Yixuan; Yan, Lu; Peng, Kang-Lin; Liu, Zimin; Wang, Yanxin

doi:10.1016/j.apgeochem.2022.105323

Cited by 22 publications

(5 citation statements)

References 72 publications

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“…In the open ocean, different water masses in the vertical profiles (>1800m) were identified in the Bay of Bengal (Sengupta et al., 2013), and the contribution of water masses was quantified between the western Pacific and the South China Sea (SCS) (>3700m) (Wu et al., 2021). In the coastal areas, the intrusion of high salinity water (Chen et al., 2020; Lian et al., 2016), and its impact on the groundwater (Tran et al., 2019; Zhang et al., 2022), and the coastal environment (Mashiatullah et al., 2016), were identified by the water isotopes. However, there are few studies on the quantitative understanding of water mass processes and their impact on the water environment.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Lao

Zhang

et al. 2022

JGR Oceans

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A new data set of seasonal stable water isotopes (δD and δ18O) and temperature‐salinity profiles was applied to improve our understanding of water mass distributions and their impact on the environment of the Beibu Gulf (BG). Our study revealed that the coastal current (CC), West‐Guangdong coastal current (WGCC), and South China Sea water (SCSW) were the three dominant water masses in the BG, and their influence was exhibited in seasonal variations. The CC was the dominant contributor to the BG water during summer (43%) and fall (45%), while it changed to the intrusion of SCSW with higher salinity in winter (57%). The contribution of WGCC to the BG was relatively stable during the three seasons (24%–31%). In addition, the nutrients in the BG were greatly affected by different water mixing occurring in the gulf. The nutrients mainly originated from the CC in summer (52%–68%) and fall (32%–69%), while the dominant source shifted to the WGCC in winter (36%–69%). Moreover, the contribution of SCSW to the nutrients loading (15%–49%) in the BG was relatively high due to its high contribution (57%) to the BG water during winter. These indicated that the BG has a stable input of external nutrients from different water masses to sustain primary production in the BG. Our study uses dual water isotopes to quantify the seasonal intrusion of water masses and their impact on nutrients, providing a new method to study the impact of the distribution of water masses on nutrients in the gulf.

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Section: Introductionmentioning

confidence: 99%

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Lao

Zhang

et al. 2022

JGR Oceans

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“…Its formation is driven by the different densities between freshwater and seawater, but it also can be intensified and extended landward due to local groundwater overexploitation or recharge reduction. Moreover, groundwater salinization problems induced by the high‐productivity expanded mariculture practices have been exposed in the coastal area (Daguansha) along Xicun Bay, which is located about 80 km to the southeast of Qinzhou Bay (Y. Zhang, Li, et al., 2022). The mariculture practices growing in Qinzhou Bay may pose a similar concern to the groundwater salinization problem.…”

Section: Introductionmentioning

confidence: 99%

A Hydrochemical Study of Groundwater Salinization in Qinzhou Bay, Guangxi, Southern China

Huang

Han

et al. 2023

Earth and Space Science

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The salinity of groundwater in Qinzhou Bay has been increasing since 2013. This phenomenon affects livelihoods and the local agricultural economy, specifically in the Longmengang area. In this work, we investigate the causes of water salinization to provide evidence for effectively managing the local water resources and improving water quality. We collected 110 samples of water from spatially distributed local wells, rivers, reservoirs, and the sea, and conducted a hydrochemical study complemented by numerical modeling. We found that water pumping and mariculture practices are the principal contributors to seawater intrusion into the groundwater table, which leads to increased water salinization.

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“…Typically, SWI is assessed through a combination of hydrochemical and either 1) isotopic methods as seen in studies by Liu et al (2017), Chafouq et al (2017), Bahir et al (2018), Zhang et al (2015), Nair et al (2015), Liu et al (2014), Zhang et al (2022), Xia et al (2022), Chidambaram et al (2022), Balasubramanian et al (2022), Mosaffa et al (2021), Kim et al (2021), Telahigue et al (2020), Dhakate et al (2020), Boumaiza et al (2020), Nogueira et al (2019), Maurya et al (2019), and Mongelli et al (2013), or 2) geophysical methods as seen in studies by Sae-Ju et al (2020), Gopinath et al (2019), Sae-Ju et al (2018), Fadili et al (2015), Kura et al (2014), Lagudu et al (2013), Gurunadha Rao et al (2011), Kouzana et al (2009), 3 Lee et al (2002), and Bouzouf et al (2001). These combinations of interdisciplinary methods have been successful (Werner et al 2013;Kura et al 2014;Jiao and Post 2019;Yusuf et al 2021), but isotopic and geophysical methods can be expensive, which leads to their limited use in developing countries (Clark and Page 2011;Asare et al 2021).…”

Section: Introductionmentioning

confidence: 99%

An integrated seawater intrusion assessment in the Moroccan Ghiss-Nekor coastal aquifer using hydrogeochemical and geospatial techniques

BOURJILA

Dimane

GHALIT³

et al. 2023

Preprint

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Effective management of coastal aquifers requires a thorough understanding of seawater intrusion (SWI). The Ghiss-Nekor aquifer is one such area where the extent of SWI is unclear. This study aimed to map the extent of SWI using the hydrogeochemical approach combined to geospatial techniques. Accordingly, we coupled various geochemical indicators, including four ionic ratios (Cl/HCO3, SO4/Cl, Na/Cl, and Mg/Mg+Ca) and two SWI indices (GQIswi and SMI), with geospatial methods to generate a map highlighting the regions most prone to SWI. As a result, approximately 20% of the study area was impacted by SWI, with 70% of SWI spots found within 2 km of the shoreline. A saline water detected up to 5 km from the coast was interpreted, through the use of the aquifer's stratigraphic model, as being caused by the intrusion of seawater from the Souani area that is trapped in a deep clay-marly substratum. These promising findings highlight the effectiveness of the applied hydrogeochemical approach and offer crucial information regarding the extent of SWI. This information will aid decision-makers in the Al Hoceima region in creating efficient groundwater management plans to tackle the effects of climate change, especially the shortage of water resources caused by declining levels of precipitation.

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Groundwater salinization in a subtropical region, Beihai, southern China: Insights from hydrochemistry and multiple isotopes (H, O, S, Sr)

Cited by 22 publications

References 72 publications

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

A Hydrochemical Study of Groundwater Salinization in Qinzhou Bay, Guangxi, Southern China

An integrated seawater intrusion assessment in the Moroccan Ghiss-Nekor coastal aquifer using hydrogeochemical and geospatial techniques

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