Hisashi Narita, H. ., School of Marine Science and T, Shizuoka, Japan, hisashin@scc.u-tokai.ac.jp
Yoko Tange, Y. ., School of Marine Science and Technology, Tokai University, Shizuoka, Japan,
Yoko, Y. ., Kishi, Shizuoka, Japan,
Akihiro, A. ., Takahara, Shizuoka, Japan,
Jing Zhang, J. ., Toyama University, Toyama, Japan,

FLOW SYSTEM AND DENITRIFICATION OF SHALLOW GROUNDWATER IN THE DOZEN PLAIN, SAIJO, JAPAN

Major ion concentrations, nutrients and stable isotopes in shallow groundwater have been measured to understand the groundwater flow system, and characteristics of the denitrification process with groundwater flow and salt water intrusion processes. These measurements were made in the Dozen plain, which is a major part of Saijo city, located in the north of the Shikoku Island, southwestern Japan. The main feature of the groundwater systems in this area is that is an artesian in the coastal area, where there are tidal flats, have existed at least 400 yrs. The artesian flow system in these area may be the past submarine groundwater discharge system. 　　　 The groundwater in the plain may be recharged by either precipitation over the plain or by four river waters from the east to the west (R. Uzui, R. Kamo, R. Nakayama and R. Daimyoujin).　Even in the eastern part of the plain, the contribution of the Daimyojin river water (high silicate concentrations), which flows from a granite mountain, influenced by denitrification (low oxygen and nitrate concentrations), is relatively larger than local precipitation or water from the other rivers.

Poster presentation

Presentation is given by student: No
Session #:089
Date: 03-06-2008
Time: 17:30 - 19:30