[2C10-16] Fukushima 2

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)

[2C15] Investigation on distribution of radioactive substances in Fukushima(10) Effect of bedrock groundwater on the concentration of dissolved Cs-137 in surface water in the headwaters of forests in Namie Town

*Haruki Nakada¹, Hiroaki Kato^1,2, Yuma Niwano¹, Yuichi Onda^1,2 (1. Tsukuba University, 2. CENTER FOR RESEARCH IN RADIATION ISOTOPES, AND EARTH SYSTEM SCIENCE)

Keywords:

radioactive material,Dissolved cesium137,Deep Groundwater,hydraulic grade

The purpose of this study is to elucidate the influence of shallow and deep groundwater runoff characteristics with diverse residence times on Cs-137 concentrations in surface water on forest slopes. To this end, detailed hydrological monitoring and measurement of Cs concentrations in groundwater and surface water will be carried out, with a particular focus on observations during runoff. Dissolved Cs concentrations during runoff show time-series variations and hysteresis in flow rates and hydrodynamic gradients, indicating the possibility of mixing of water from different sources.