Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

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

[A-HW24] Isotope Hydrology 2019

Mon. May 27, 2019 10:45 AM - 12:15 PM 105 (1F)

convener:Masaya Yasuhara(Rissho Univ.), Kohei Kazahaya(Geological Survey of Japan, AIST), Shinji Ohsawa(Institute for Geothermal Sciences, Graduate School of Science, Kyoto University), Kazuyoshi Asai(Geo Science Laboratory), Chairperson:Noritoshi Morikawa(産業技術総合研究所活断層・火山研究部門), Kazuyoshi Asai(Geo-Science Laboratory), Kohei Kazahaya(Geological Survey of Japan, AIST)

11:30 AM - 11:45 AM

[AHW24-07] Spatial distribution of chemical compositions, hydrogen and oxygen isotopic ratios of stream water of the Shimanto River area, southwestern Japan

*Masaaki Takahashi1, Hinako Shimizu1, Kohei Kazahaya1, Masaya Yasuhara2,1 (1.The National Institute of Advanced Industrial Science and Technology, 2.Rissho University)

Keywords:stream water of the Shimanto River, hydrogen and oxygen isotopic ratio, altitude effect, amount effect, inland effect

109 river water samples were collected from 101 locations in the Shimanto River system and adjacent streams in the western part of Kochi Prefecture and southern part of Ehime Prefecture in December 2007, November 2008, and December 2009, for the purpose of understanding how the distribution of δD and δ18O can be explained by geographical parameters (latitude (LAT), altitude (ELV) and inland degree (Distance from the nearest seashore; DS)) and meteorological parameters (mean annual temperature (MAT) and mean annual precipitation (MAP)), and what is the difference in those explanatory variables of the distribution of δD and δ18O compared to the national level. As a result, it was found that the spatial distribution of δD, δ18O of stream water in the Shimanto area can be shown in detail by using ELV and DS as geographical parameters and MAP as meteorological parameters as explanatory variables.