Tidal groundwater flow and its potential effect on the hydrochemical characteristics in a mud-sand-layered aquifer in Daya Bay, China

Feng, Xiaobo1; Xiao, Kai2,3; Li, Hailong1,2

2020-04-18

10.1007/s11356-020-08809-x

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH   影响因子和分区

0944-1344

1614-7499

Tidal groundwater dynamics and hydrochemistry can play important roles in influencing nearshore ecological and environmental systems. However, the potential relationship between the groundwater dynamics and the hydrochemical characteristics was not well understood. In this study, we conducted an integrated investigation by field work and numerical simulations to explore the potential effect of tidal groundwater dynamics on hydrochemistry in an intertidal mudflat in Daya Bay, China. The time series of groundwater level were monitored over a spring-neap tidal cycle along a 200-m-long intertidal transect, which had a mud-sand-layered aquifer. The shallow groundwater samples were collected to analyze the spatial distributions of hydrochemical characteristics, including major ions (Na+, K+, Ca2+, Mg2+, SO42-, HCO3-, and Cl-), heavy metals (As and Cu), and short-lived radium isotopes (Ra-223 and Ra-224). The groundwater transport process along the transect was simulated for understanding the groundwater flow field and quantifying the groundwater-seawater exchange rates across the water-sediment interface. The integrated results indicated that the seawater-groundwater interactions play a great influence on the groundwater hydrochemistry. For example, the major ions showed various degrees of enrichment and loss, such as losses of SO42- due to microbial sulfate reduction, and enrichment of HCO3-, Ca2+, and Mg2+ under the water-rock interactions. Heavy metals were transported by groundwater and accumulated in the intertidal sediments. In addition, there was a negative correlation between short-lived radium isotope activities and oxidation-reduction potential. However, the relationship between seawater-groundwater exchange rates and the short-lived radium isotope activities was not significant.

Numerical simulation Seawater-groundwater interactions Radium activity Heavy metals Coastal groundwater

SCI

英语

通讯

China Postdoctoral Science Foundation[2018M640730]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000527505000021

SPRINGER HEIDELBERG

ENVIRONMENT/ECOLOGY

Web of Science

1.China Univ Geosci, Sch Water Resources & Environm Sci, Beijing 100083, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Prov Key Lab Soil & Groundwater Pollut, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Feng, Xiaobo,Xiao, Kai,Li, Hailong. Tidal groundwater flow and its potential effect on the hydrochemical characteristics in a mud-sand-layered aquifer in Daya Bay, China[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2020,27(19):24438-24451.

Feng, Xiaobo,Xiao, Kai,&Li, Hailong.(2020).Tidal groundwater flow and its potential effect on the hydrochemical characteristics in a mud-sand-layered aquifer in Daya Bay, China.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,27(19),24438-24451.

Feng, Xiaobo,et al."Tidal groundwater flow and its potential effect on the hydrochemical characteristics in a mud-sand-layered aquifer in Daya Bay, China".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 27.19(2020):24438-24451.