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| Titel |
Temporal and spatial variation of groundwater in quantity and quality in sand dune at coastal region, Kamisu city, central Japan. |
| VerfasserIn |
Yohei Umei, Maki Tsujimura, Koichi Sakakibara, Yasuto Watanabe, Motomitsu Minema |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130876
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| Publikation (Nr.) |
 EGU/EGU2016-11199.pdf |
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| Zusammenfassung |
| The role of groundwater in integrated water management has become important in recent 10
years, though the surface water is the major source of drinking water in Japan. Especially, it is
remarked that groundwater recharge changed due to land cover change under the
anthropogenic and climatic condition factors. Therefore, we need to investigate temporal and
spatial variation of groundwater in quantity and quality focusing on the change during recent
10-20 years in specific region. We performed research on groundwater level and quality in
sand dune at coastal region facing Pacific Ocean, Kamisu city, Ibaraki Prefecture, which have
been facing environmental issues, such as land cover change due to soil mining for
construction and urbanization. We compared the present situation of groundwater with
that in 2000 using existed data to clarify the change of groundwater from 2000 to
2015.
The quality of water is dominantly characterized by Ca2+-HCO3− in both 2000 and
2015, and nitrate was not observed in 2015, though it was detected in some locations in 2000.
This may be caused by improvement of the domestic wastewater treatment. The topography
of groundwater table was in parallel with that of ground surface in 2015, same as that in
2000. However, a depletion of groundwater table was observed in higher elevation area in
2015 as compared with that in 2000, and this area corresponds to the locations where the land
cover has changed due to soil mining and urbanization between 2015 and 2000. In the
region of soil mining, the original soil is generally replaced by impermeable soil
after mining, and this may cause a decrease of percolation and net groundwater
recharge, thus the depletion of groundwater table occurred after the soil mining. |
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