Departmental Bulletin Paper Estimation of Amount of Groundwater Pumping Discharge and Its Effect on Salinization of Groundwater around Ito Campus, Kyushu University

Konishi, Keisuke  ,  Hiroshiro, Yoshinari

76 ( 1 )  , pp.1 - 18 , 2016-07-04 , Faculty of Engineering, Kyushu University
Kyushu University has been constructing its new campus (Ito Campus) in an area spanning the Motooka-Kuwabara district in Fukuoka City. Agriculture is active in this area and a large amount of groundwater is used forirrigation and horticulturalfacilities. In recent years, land development for house building has proceeded and one of groundwater recharge sources, paddy area has decreased. Therefore, it is the urgent need to grasp the total amount of groundwater discharge by pumping wells. It was estimated that dividing into three usage ways; for living, agricultureandbusiness. The result showsthe daily average groundwater discharge is approximately 635m^3and the percentages of groundwater usageare 59 percent for agriculture, 38 percent for living and 3 percent for business.Next, saline-affected groundwater by effects of groundwater pumping was evaluated from value changes of EC(electrical conductivity), Na and Clat the wells for agriculture.Consequently, it was revealed that groundwater pumping has an effect on salinization of groundwater and its influences were reflected on the groundwater quality about one month later.

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