3:30 PM - 3:50 PM
[SEM15-01] Comparison of Resistivity Monitoring and Water Flow Simulation in a Paddy Field damaged by an Earthquake
★Invited Papers
Keywords:Resistivity Monitoring, Water Flow Simulation, Paddy Field damaged by an Earthquake
The 2016 Kumamoto earthquake had a seismic intensity of 6- in this area according to the Japan Meteorological Agency. After the paddy was ploughed and irrigated, water did not spread across all of the paddy field. Although no cracks were observed from the surface, the water filling failed.
In this study, resistivity changes during water-filling experiment were derived from 3D inversion of resistivity survey data to estimate the infiltration path from the paddy field, and were compared with the resistivity change of 3D inversion from simulated resistivity survey data with some possible water flow models.
Water-filling experiment and resistivity survey were conducted. The area filled with water was surrounded by three banks of the field and a plastic plate. Supply of water (124 mS/m : 8.06Ωm) from the center of the recharge
area, and resistivity survey 8 lines with 1 m electrodes spacing. Time lapse of volume water content was measured and, the water content at bank S started to changed 1.4 h after and 2.0 h at bank N.
Resistivity change with field resistivity survey data and resistivity change with simulated resistivity survey data of water flow simulation were compared. The resistivity change from the water flow simulation with three leakage parts is similar to the resistivity change form field survey data. Comparing the water flow models with hydraulic conductivity of 10-6 and 10-5 m/s at paddy field, the water flow model with hydraulic conductivity of 2×10-6 m/s at paddy field is closer to the results from field survey data.
In this study, resistivity changes during water-filling experiment were derived from 3D inversion of resistivity survey data to estimate the infiltration path from the paddy field, and were compared with the resistivity change of 3D inversion from simulated resistivity survey data with some possible water flow models.
Water-filling experiment and resistivity survey were conducted. The area filled with water was surrounded by three banks of the field and a plastic plate. Supply of water (124 mS/m : 8.06Ωm) from the center of the recharge
area, and resistivity survey 8 lines with 1 m electrodes spacing. Time lapse of volume water content was measured and, the water content at bank S started to changed 1.4 h after and 2.0 h at bank N.
Resistivity change with field resistivity survey data and resistivity change with simulated resistivity survey data of water flow simulation were compared. The resistivity change from the water flow simulation with three leakage parts is similar to the resistivity change form field survey data. Comparing the water flow models with hydraulic conductivity of 10-6 and 10-5 m/s at paddy field, the water flow model with hydraulic conductivity of 2×10-6 m/s at paddy field is closer to the results from field survey data.