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Hydrochemical and isotopic investigation to characterize the effect of snowmelt infiltration on groundwater in a snowy landslide area of Japan
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-06-16 , DOI: 10.1007/s12665-021-09722-3
Takeo Tsuchihara , Takehiko Okuyama , Katsushi Shirahata , Shuhei Yoshimoto , Hiroomi Nakazato , Satoshi Ishida

Snowmelt infiltration is one of the key factors that trigger landslides. This study focused on characterization of snowmelt infiltration in the Shimekake landslide block in northeastern Japan via long-term monitoring of major ion concentrations and stable isotope ratios of groundwater and precipitation. Results revealed seasonal variations of the d-excess values of precipitation, which were significantly higher in winter. Likewise, the d-excess values of the groundwater increased during the melting season. Groundwaters collected from 17 sites in the landslide blocks were classified into five types based on a comparison of hydrochemical and isotopic compositions between melting and non-melting seasons. Groundwater with significantly higher d-excess values during the melting season was diluted by infiltration of snowmelt, which resulted in a decrease in ion concentrations. Three groundwater types underwent large changes in electrical conductivity and/or ion concentrations during the melting season, even though the d-excess values did not change significantly. These groundwaters were inferred to have been affected by the arrival of groundwater with different chemical compositions as a result of elevation of the water table by infiltration of snowmelt. The fifth type of groundwater was less affected by snowmelt infiltration. The results indicated the existence of preferential subsurface flows and a heterogeneous flow system in this landslide block.



中文翻译:

表征日本雪山滑坡区融雪入渗对地下水影响的水化学和同位素研究

融雪入渗是引发滑坡的关键因素之一。本研究的重点是通过长期监测地下水和降水的主要离子浓度和稳定同位素比来表征日本东北部 Shimekake 滑坡块的融雪入渗特征。结果表明,降水的 d 超值存在季节性变化,冬季明显偏高。同样,地下水的 d-excess 值在融化季节增加。根据融化和非融化季节之间的水化学和同位素组成的比较,从滑坡块的 17 个地点收集的地下水被分为五种类型。在融雪季节,d-excess 值显着较高的地下水被融雪的渗透稀释,导致离子浓度下降。在融化季节,三种地下水类型的电导率和/或离子浓度发生了很大的变化,尽管 d-excess 值没有显着变化。推断这些地下水受到由于融雪渗透导致地下水位升高而具有不同化学成分的地下水的影响。第五种地下水受融雪入渗影响较小。结果表明该滑坡块中存在优先的地下流和非均质流系统。推断这些地下水受到由于融雪渗透导致地下水位升高而具有不同化学成分的地下水的影响。第五种地下水受融雪入渗影响较小。结果表明该滑坡块中存在优先的地下流和非均质流系统。推断这些地下水受到由于融雪渗透导致地下水位升高而具有不同化学成分的地下水的影响。第五种地下水受融雪入渗影响较小。结果表明该滑坡块中存在优先的地下流和非均质流系统。

更新日期:2021-06-17
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