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Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply
http://hdl.handle.net/10069/00040484
http://hdl.handle.net/10069/00040484318e3daa-4fc5-495d-b23c-d69d717b3e67
名前 / ファイル | ライセンス | アクション |
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Minerals11_43.pdf (9.0 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-01-27 | |||||
タイトル | ||||||
タイトル | Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 2016 Kumamoto earthquake | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Groundwater | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Nitrate | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Self-organizing maps | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Nakagawa, Kei
× Nakagawa, Kei× Shimada, Jun× Yu, Zhi-Qiang× Ide, Kiyoshi× Berndtsson, Ronny |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The 2016 Kumamoto earthquake had a significant impact on groundwater levels and quality. In some areas, the groundwater level increased significantly due to the release of groundwater from upstream mountainous regions. Conversely, the groundwater level in other areas greatly decreased due to the creation of new fracture networks by the earthquake. There were also significant changes in certain groundwater quality variables. In this study, we used clustering based SOM (self-organizing maps) analysis to improve the understanding of earthquake effects on groundwater quality. We were especially interested in effects on groundwater used for drinking purposes and in nitrate concentration. For this purpose, we studied groundwater nitrate (NO3 + NO2–N) concentrations for the period 2012–2017. Nitrate concentration changes were classified into seven typical SOM clusters. The clusters were distributed in three representative geographical regions: A high concentration region (>4 mg/L), a low concentration region (<1.6 mg/L) with minimal anthropogenic loading area, and an intermediate concentration region (2–4 mg/L). Depending on these regions, the nitrate concentration changes just before and after the earthquake had both increasing and decreasing trends between 2015–2017. This points to complex physiographical relationships for release of stored upstream groundwater, promotion of infiltration of shallow soil water/groundwater, and nitrate concentration as affected by earthquakes. We present an analysis of these complex relationships and a discussion of causes of nitrate concentration changes due to earthquakes. | |||||
書誌情報 |
Minerals 巻 11, 号 1, p. 43, 発行日 2020-12-31 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2075-163X | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.3390/min11010043 | |||||
権利 | ||||||
権利情報 | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Minerals, 11(1), art.no.43 ;2021 |