HR: 1340h
AN: H33D-1618    [Abstracts]
TI: Temporal change of groundwater temperature by a storm event
AU: * Aichi, M
EM: aichi@geoenv.k.u-tokyo.ac.jp
AF: Department of Geosystem Engineering, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan
AU: Tokunaga, T
EM: tokunaga@k.u-tokyo.ac.jp
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Obanawa, H
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Mogi, K
AF: Department of Geosystem Engineering, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan
AU: Hakuta, K
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Hashiguchi, S
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Imai, Y
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Kainosho, H
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Kiyokuni, A
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Matsumoto, S
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Ohno, K
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Nagasawa, H
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Nojiri, T
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Shimizu, Y
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Tomita, S
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AU: Yamashita, K
AF: Department of Environment Systems, School of Frontier Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8561, Japan
AB: Possible seawater intrusion into the coastal unconfined aquifer caused by the passage of a typhoon was observed from the time-series data of water table, groundwater temperature and barometric pressure at the Niijima Island, Japan. We carried out continuous measurements of these data from 12:00 on June 16th to 16:00 on July 20th, 2007. A typhoon passed through the area at around 13:00 on July 15th. We observed significant drop of barometric pressure, rise of water table and increase of groundwater temperature by this event. To analyze the cause of this transient phenomena, we first estimated hydraulic diffusivity of the aquifer from barometric and tidal responses of water table before the passage of the typhoon. Then, height of sea level was estimated from barometric pressure and an astronomical tide table. Quantitative analysis using both estimated hydraulic diffusivity and estimated height of sea level suggested the sea water intrusion occurred by this event. Increase of groundwater temperature also supported this interpretation.
DE: 1829 Groundwater hydrology
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2007 Fall Meeting