Cl- as a Chemical Fingerprint of Solute Transport in the Aquitard-Aquifer System of the North Jiangsu Coastal Plain, China
Cl- as a Chemical Fingerprint of Solute Transport in the Aquitard-Aquifer System of the North Jiangsu Coastal Plain, China
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Cl-作为苏北沿海平原弱透水层-含水层系统溶质运移的化学指纹
DOI：
10.1155/2017/6131547
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发表时间：
2017
期刊：
影响因子：
1.7
通讯作者：
Liu yan
中科院分区：
文献类型：
--
作者：
Ge qin;Liang xing;Jin menggui;Li Jing;Liu yan
通过对苏北滨海平原弱透水层-含水层系统孔隙水中Cl-的详细垂直剖面分析，建立了苏北滨海平原天然示踪剂迁移的演化过程和迁移时间的概念模型。Cl−剖面的一维垂直模拟模型表明，扩散似乎是弱透水层-含水层系统中主要的溶质运移机制。地下水向下流动并没有改善模拟值和实测值之间的拟合。模拟结果表明，Cl−剖面的演化主要是由于海水和淡水的海侵-海退作用进入第一承压含水层和上边界所致。第一承压含水层中的地下水由晚更新世冰川融水（25-15 ka BP）补给，这是对低Cl−浓度的响应。第一承压含水层浅层地下水和高盐孔隙水是全新世海水入侵的产物。这些时间框架也是一致的，有利的研究区域的古水文学与以前的研究结果。
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.