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Geofluids
Volume 2017, Article ID 6131547, 16 pages
https://doi.org/10.1155/2017/6131547
Research Article

Cl as a Chemical Fingerprint of Solute Transport in the Aquitard-Aquifer System of the North Jiangsu Coastal Plain, China

1School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
2Hubei Province Key Laboratory of Wetland Evolution and Ecology Restoration, China University of Geosciences, Wuhan 430074, China
3State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
4Key Laboratory of Ministry of Land and Ground Fissure Disaster, Nanjing 210018, China

Correspondence should be addressed to Qin Ge; moc.621@72809niqeg and Xing Liang; nc.ude.guc@gnailx

Received 14 July 2017; Revised 4 October 2017; Accepted 17 October 2017; Published 9 November 2017

Academic Editor: Xiaoqing Shi

Copyright © 2017 Qin Ge et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Detailed vertical profiles of Cl in porewaters through the aquitard-aquifer system were used to yield solute transport mechanism and build a conceptual model regarding evolution processes and transport time of natural tracer migration in North Jiangsu coastal plain, China. One-dimensional vertical simulated models of Cl profiles illustrate that diffusion appeared to be the dominant solute transport mechanism in the aquitard-aquifer system. A downward groundwater flow did not improve the fitness between simulated and measured values. Several simulated models were constructed and suggested that the evolution of the Cl profiles is mainly ascribed to the introduction of seawater and freshwater of transgression-regression to the first confined aquifer and the upper boundary. Groundwater in the first confined aquifer recharged by the Late Pleistocene glacial meltwater (25–15 ka BP) was supported in response to the low Cl concentrations. The shallow groundwater in the first confined aquifer and porewater with high salt were attributable to the Holocene seawater intrusion. These timeframes were also consistent favorably with the results of previous studies into the palaeohydrology of the study area.