9 件中 1 - 9 件目
| 年度 Year |
論文題目名 Title of the articles |
共著区分 Collaboration Classification |
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| 掲載誌名 Journal name，出版機関名 Publishing organization，巻／号 Vol./no.，頁数 Page nos.，発行年月（日） Date | |||
| 2023 | A Thermal Regime and a Water Circulation in a Very Deep Lake: Lake Tazawa, Japan | 共著 | |
| Water ， Multidisciplinary Digital Publishing Institute ， Article numbe 5338-5359 ， 2024/03/16 | |||
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| 2022 | 名古屋市名東区猪高緑地・すり鉢池における水域の歴史的変化と水収支について | 共著 | |
| なごやの生物多様性 ， なごや生物多様性センター ， 10 ， pp. 47-60 ， 2023/03 | |||
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| 2022 | Water Cycles and Geothermal Processes in a Volcanic Crater Lake | 共著 | |
| Hydrology ， MDPI ， 10/3 ， pp. 54-76 ， 2023/02/22 | |||
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概要（Abstract） Exploring how the hydrological and thermal conditions of a volcanic lake change in response to volcanic activity is important to identify the signs of a volcanic eruption. A water cycle system and a geothermal process in a crater lake, Okama, in the active Zao Volcano, Japan, were explored by estimating the hydrological and chemical budgets of the lake, and analyzing the time series of lake water temperature, respectively. In 2021, the lake level consistently increased by snowmelt plus rainfall in May–June, and then stayed nearly constant in the rainfall season of July–September. The hydrological budget estimated during the increasing lake level indicated that the net groundwater inflow is at any time positive. This suggests that the groundwater inflow to the lake is controlled by the water percolation into volcanic debris from the melting of snow that remained in the catchment. Solving the simultaneous equation from the hydrological and chemical budgets evaluated the groundwater inflow, Gin, at 0.012–0.040 m3/s, and the groundwater outflow, Gout, at 0.012–0.027 m3/s in May–September 2021. By adding the 2020 values of Gin and Gout evaluated at the relatively high lake level, it was found that Gin and Gout exhibit highly negative and positive correlations (R2 = 0.661 and 0.848; p < 0.01) with the lake level, respectively. In the completely ice-covered season of 15 December 2021–28 February 2022, the lake water temperature increased between the bottom and 15 m above the bottom at the deepest point, which reflects the geothermal heat input at the bottom. The heat storage change during the increasing water temperature was evaluated at a range of −0.4–5.5 W/m2 as the 10-day moving average heat flux. By accumulating the daily heat storage change for the calculated period, the water temperature averaged over the heated layer increased from 1.08 to 1.56 °C. The small temperature increase reflects a stagnant state of volcanic activity in the Zao Volcano. The present study could be useful to investigate how an active volcano responds to water percolation and geothermal heat. |
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備考（Remarks） https://doi.org/10.3390/hydrology10030054 |
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| 2022 | Effects of a Volcanic-Fluid Cycle System on Water Chemistry of a Deep Caldera Lake: Lake Tazawa, Akita Prefecture, Japan | 共著 | |
| water ， MDPI ， 14/19 ， pp. 3186-3205 ， 2022/10/10 | |||
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概要（Abstract） Lake Tazawa, the deepest lake (423.4 m depth at maximum) in Japan underwent drastically changed water quality in 1940, because volcanic water from two active volcanos was then drawn into the lake for power generation and irrigation. Thereby, the pH of lake water decreased from 6.7 to 4.2, which exterminated a land-locked type of sockeye salmon, Oncorhynchus nerka kawamurae (locally called Kunimasu trout). Additionally, the mean residence time of lake water changed from 195 years to 8.9 years by rapidly increasing the outflow for power generation and irrigation. In this study, long-term chemical fluxes controlling lake water chemistry were obtained, and a groundwater water cycle system between the lake and the volcano was explored by estimating hydrological and chemical budgets of the lake. In the chemical budget estimate, two ionic species, SO42− and Cl−, in volcanic fluids were chosen and each mass conservation equation was yielded. The hydrological budget estimate gave us the net groundwater inflow at −1.36 m3/s on average over three periods in 2020–2021, and then the simultaneous equation coupled with the chemical budget equation allowed us to separate into groundwater inflow and outflow at 6.01 m3/s and 7.37 m3/s, averaged over the three periods, respectively. The evaluated groundwater inflow and outflow were compared with those of the other crater or caldera lakes. The linear relationship between the lake volume and the magnitude of groundwater inflow or outflow suggests that the groundwater cycle scale in such a lake increases with the magnitude of the volcanic eruption to have formed the lake. |
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備考（Remarks） https://doi.org/10.3390/w14193186 |
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| 2022 | 宮古島吉野海岸の固結砂層と湧水の分析結果 | 共著 | |
| 季刊地理学 ， 東北地理学会 ， 74/2 ， pp. 68-77 ， 2022/06/17 | |||
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概要（Abstract） 宮古島南東の吉野海岸では，湧水の流路に沿って板状に固結した複数の砂層がみられる。湧水の水質が砂層の固結に関係している可能性が高いと推量し，因果関係を解明する基礎試料を得るため，湧水，固結砂層およびその下方の非固結砂層を採取して分析した。その結果，砂層の固結は石灰岩を溶解した湧水に含まれるCaCO3の析出による可能性が高いと考察した。 |
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備考（Remarks） https://doi.org/10.5190/tga.74.2_68 |
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| 2020 | Microdiversity and phylogeographic diversification of bacterioplankton in pelagic freshwater systems revealed through long-read amplicon sequencing | 共著 | |
| Microbiome ， Springer Nature ， 24/9 ， 1-15 ， 2021/01/22 | |||
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| 2019 | 山岳湖沼における結氷現象と気候変動との関係 | 共著 | |
| 陸水物理学会誌 ， 陸水物理学会 ， 2 ， pp. 1-11 ， 2020/02/01 | |||
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| 2019 | 固相抽出ICP-MSによる摩周湖水中の微量鉛の定量及び同位体比測定 | 共著 | |
| 分析化学 ， 日本分析化学会 ， 68/11 ， 877-883 ， 2019/11/05 | |||
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| 2019 | Geothermal Linkage between a Hydrothermal Pond and a Deep Lake: Kuttara Volcano, Japan | 共著 | |
| Hydrology ， MDPI ， 6/1 ， pp. 4-14 ， 2019/01/06 | |||
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概要（Abstract） Kuttara Volcano, Hokkaido, Japan, consists of temperate Lake Kuttara and the western Noboribetsu geothermal area. In order to explore geothermal relations between Lake Kuttara and the geothermal area, the heat budget of a hydrothermal pond, Okunoyu, was evaluated, and the heat storage change in the lower layer of Lake Kuttara was calculated by monitoring the water temperature at the deepest point. The lake water temperature consistently increased during the thermal stratification in June-November of 2013-2016. The heat flux Q(B) at lake bottom was then calculated at a range of 4.1-10.9 W/m(2), which is probably due to the leakage from a hydrothermal reservoir below the lake bottom. Meanwhile, the heat flux H-G(in) by geothermal groundwater input in Okunoyu was evaluated at 3.5-8.5 kW/m(2), which is rapidly supplied through faults from underlying hydrothermal reservoirs. With a time lag of 5 months to monthly mean Q(B) values in Lake Kuttara, the correlation with monthly mean H-G(in) in Okunoyu was significant (R-2 = 0.586; p < 0.01). Applying Darcy's law to the leakage from the hydrothermal reservoir at 260-310 m below the lake bottom, the time needed for groundwater's passage through the media 260-310 m thick was evaluated at 148-149 days (ca. 5 months). These findings suggest that the hydrothermal reservoir below lake bottom and the underlying hydrothermal reservoirs in the western geothermal area are both connected to a unique geothermal source in the deeper zone as a geothermal flow system of Kuttara Volcano. |
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備考（Remarks） DOI:10.3390/hydrology6010004 |
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