ASSESSMENT OF IMPACT OF KUMAMOTO EARTHQUAKE IN ASO NANGOU-DANI USING WATER BUDGET SIMULATION

Abstract

 In this study, in order to evaluate the impact of the 2016 Kumamoto earthquake on the hydrological environment in Aso Nangou-dani, a water budget model was developed based on the hydrological data obtained from the field survey. The analysis was performed for the period from 2015 to 2019. The reproducibility of the rapid rise in groundwater level immediately after the earthquake, the subsequent water level change, and the depletion and recovery process of Shioisha spring suggest that the hydraulic parameters such as hydraulic conductivity rose due to the earthquake and have not returned to their original state since then. In the area where groundwater inflow from upstream increased due to the earthquake, it is indicated that the spring volume and base runoff increased.