Groundwater flow system under a rapidly urbanizing coastal city as determined by hydrogeochemistry
Groundwater flow system under a rapidly urbanizing coastal city as determined by hydrogeochemistry
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DOI：
10.1016/j.jseaes.2010.07.012
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发表时间：
2011-01-04
影响因子：
3
通讯作者：
Taniguchi, Makoto
中科院分区：
文献类型：
--
作者：
Kagabu, Makoto;Shimada, Jun;Taniguchi, Makoto
在雅加达地区（印度尼西亚），由于人口迅速增加，过度抽取地下水，造成了与地下水有关的问题，如沿海地区的咸水污染和地面沉降。在这项研究中，我们采用了多种水文地球化学技术，以证明在雅加达地区的地下水流系统。尽管雅加达盆地几乎所有地下水都是在相似的海拔高度补给的，但其水质和停留时间表明，浅层和深层含水层之间存在明显差异。由于城市地区地下水潜力迅速下降，我们发现海水入侵和浅层和深层地下水混合，主要离子证实了这一结论。Br-：Cl-比率和氯氟烃（CFC）-12分析。从南部山腰地区采集的泉水和地下水样品显示出较年轻的年龄特征，具有高浓度的C-14和Ca-HCO 3型水化学。我们估计这些地下水的停留时间在45年内活塞流条件下的氚分析。此外，这些地下水的年龄可以限制在20-30年的活塞流评估的氟氯化碳。此外，由于CFC-12浓度的大小，我们可以在这项实地研究中使用伪年龄指标，因为我们发现主要类型的水化学和CFC-12浓度之间存在正相关关系。(C)2010爱思唯尔有限公司保留所有权利。
In the Jakarta area (Indonesia), excessive groundwater pumping due to the rapidly increasing population has caused groundwater-related problems such as brackish water contamination in coastal areas and land subsidence. In this study, we adopted multiple hydrogeochemical techniques to demonstrate the groundwater flow system in the Jakarta area. Although almost all groundwater existing in the Jakarta basin is recharged at similar elevations, the water quality and residence time demonstrates a clear difference between the shallow and deep aquifers. Due to the rapid decrease in the groundwater potential in urban areas, we found that the seawater intrusion and the shallow and deep groundwaters are mixing, a conclusion confirmed by major ions. Br-:Cl- ratios, and chlorofluorocarbon (CFC)-12 analysis. Spring water and groundwater samples collected from the southern mountainside area show younger age characteristics with high concentrations of C-14 and Ca-HCO3 type water chemistry. We estimated the residence times of these groundwaters within 45 years under piston flow conditions by tritium analysis. Also, these groundwater ages can be limited to 20-30 years with piston flow evaluated by CFCs. Moreover, due to the magnitude of the CFC-12 concentration, we can use a pseudo age indicator in this field study, because we found a positive correlation between the major type of water chemistry and the CFC-12 concentration. (C) 2010 Elsevier Ltd. All rights reserved.