Characterization and comparison of groundwater quality and redox conditions in the Arakawa Lowland and Musashino Upland, southern Kanto Plain of the Tokyo Metropolitan area, Japan
Characterization and comparison of groundwater quality and redox conditions in the Arakawa Lowland and Musashino Upland, southern Kanto Plain of the Tokyo Metropolitan area, Japan
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日本东京都区南关东平原荒川低地和武藏野高地地下水质量和氧化还原条件的特征和比较
DOI：
10.1016/j.scitotenv.2020.137783
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发表时间：
2020
影响因子：
9.8
通讯作者：
Komatsu Toshiko
中科院分区：
文献类型：
--
作者：
Saito Takeshi;Spadini Lorenzo;Saito Hirotaka;Martins Jean M.F.;Oxarango Laurent;Takemura Takato;Hamamoto Shoichiro;Moldrup Per;Kawamoto Ken;Komatsu Toshiko
地下水对地球生物圈至关重要，但由于人为和自然原因，地下水经常受到有害化合物的污染。控制地下水中有害化学品命运的一个关键因素是还原/氧化（氧化还原）条件。地下水氧化还原条件的形成因素还没有充分认识。在这项研究中，对世界上一个特大城市地下水的长期水质进行了监测和评价。我们测量和比较水文地球化学条件，包括地下水质量（35个化学参数）和氧化还原条件的5个含水层在荒川低地和武藏野高地，关东平原南部的东京都区，日本。监测结果表明：低地和高地地区地下水的主要来源是降水。荒川低地的三个含水层可能完全分离，一个非承压含水层和两个承压含水层分别处于铁还原和产甲烷条件下。相反，在武藏野高地，两个含水层中的水团在有氧条件下可能部分相连，并在相似的水文地质条件下经历相同的地下水补给和流动过程。观察到的不同地下水氧化还原条件可能是由荒川低地和武藏野高地的地下水停留时间非常不同造成的。
Groundwater is essential for the Earth biosphere but is often contaminated by harmful chemical compounds due to both anthropogenic and natural causes. A key factor controlling the fate of harmful chemicals in groundwater is the reduction/oxidation (redox) conditions. The formation factors for the groundwater redox conditions are insufficiently understood. In this study, long-term groundwater quality beneath one of the world megacities was monitored and evaluated. We measured and compared hydrogeochemical conditions including groundwater quality (35 chemical parameters) and redox conditions of five aquifers in the Arakawa Lowland and Musashino Upland, southern Kanto Plain of the Tokyo Metropolitan area, Japan. Monitoring results suggested the following: The main origin of groundwater is precipitation in both the Lowland and Upland areas. The three aquifers in the Arakawa Lowland are likely fully separated, with one unconfined and two confined aquifers under iron reducing and methanogenic conditions, respectively. Oppositely, in the Musashino Upland, the water masses in the two aquifers are likely partly connected, under aerobic conditions, and undergoing the same groundwater recharge and flow processes under similar hydrogeological conditions. The different groundwater redox conditions observed are likely caused by the very different groundwater residence times for the Arakawa Lowland and Musashino Upland.