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Effects of bedrock groundwater on spatial and temporal variations in soil mantle groundwater in a steep granitic headwater catchment
| Title: | Effects of bedrock groundwater on spatial and temporal variations in soil mantle groundwater in a steep granitic headwater catchment |
| Authors: | Katsura, Shin'ya Browse this author | | Kosugi, Ken'ichirou Browse this author | | Mizutani, Tasuku Browse this author | | Okunaka, Suemi Browse this author | | Mizuyama, Takahisa Browse this author |
| Issue Date: | 2008 |
| Publisher: | American Geophysical Union |
| Journal Title: | Water Resources Research |
| Volume: | 44 |
| Issue: | 9 |
| Start Page: | W09430 |
| Publisher DOI: | 10.1029/2007WR006610 |
| Abstract: | [1] We investigated processes of soil mantle groundwater generation in a granitic headwater catchment in central Japan. Two types of groundwater were observed: ephemeral-type groundwater (EG), which developed in response to rainfall events and disappeared rapidly after the events ceased, and semiperennial-type groundwater (SPG), which remained formed for more than several months. The groundwater level, chemistry, and temperature within the soil and bedrock layers indicated that the source of EG was rain or soil water, whereas the source of SPG was deep bedrock groundwater. The generation processes of soil mantle groundwater varied both spatially and temporally under the influence of the underlying bedrock. Whereas only EG was generated in upslope areas, bedrock groundwater continuously seeped into the soil layers in downslope areas to generate SPG. In middle-slope areas, an increase in the bedrock groundwater level generated SPG in soil layers, but the SPG disappeared when the bedrock groundwater level fell. Our results indicate that bedrock is important in controlling soil mantle groundwater generation and water flow processes in headwater catchments and that direct measurements of bedrock conditions are vital for clarifying the roles of bedrock in these processes. |
| Rights: | Copyright 2008 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86254 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 桂 真也
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