Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW26] Water Environment and Geology in Urban Areas

Wed. May 23, 2018 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Kei Nishida(Interdisciplinary Centre for River Basin Environment, Interdisciplinary Graduate School, University of Yamanashi), Hiroaki SUZUKI(日本工営株式会社 中央研究所, 共同), Asada Motoyuki(Shimizu Corporation, Institute of Technology)

[AHW26-P02] Role of groundwater seepage in maintaining low flows in a concrete-lined urban river - A case study in Nomi-gawa river, Ohta Ward, Tokyo, Japan -

Atsushi Fujioka1, *Masaya Yasuhara2, Yuichi Suzuki2, Seongwon Lee2, Takashi Nakamura3, Noritoshi Morikawa4 (1.USEN Corporation, 2.Rissho Univ., 3.International Research Center for River Basin Environment, Univ. of Yamanashi, 4. Geological Survey of Japan, AIST)

Keywords:Tokyo metropolitan area, concrete-lined urban river, maintenance of low river flow, groundwater seepage

Role of groundwater seepage in maintaining low flows in a concrete-lined urban river was studied in Nomi-gawa river, Ohta Ward, Tokyo, Japan. Despite concrete-lining side walls and river bed, groundwater seeps out through gaps of concrete walls and discharge pipes to make a contribution for the formation of river flows. On the basis of electric conductivity, it was made clear that this kind of groudwater seepage accounts for in the range between 10% (20 Jan., 2018) and 35% (26 Oct., 2015) of low flows in Nomi-gawa river.