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[SGC36-P04] The relationship between growth of CO2 bubbles and changes of water-level in groundwater induced by seismic waves
Keywords:CO2, bubble growth, earthquake, groundwater-level changes
Earthquakes sometimes induce groundwater-level changes around their epicenters. Groundwater-level changes can be understood mainly by coseismic strain changes of earthquakes, some of which cannot be explained. Here, we focused on the bubble growth induced by seismic waves, and simulated bubble growth theoretically.
We have simulated the bubble radius and gas-liquid volume ratios for the step-like depressurization and pressure oscillation in several sets of frequencies, amplitudes, and bubble number densities using bubble growth model from Tisato et al. (2015) to understand relationships between growth of CO2 bubbles and changes of water-level in groundwater.
The step-like depressurization increases the radius of the single bubble monotonously, to the gas-liquid equilibrium. Gas-liquid volume ratios also increased with increasing bubble radii. The bubble radius oscillated and increased monotonically to an equilibrium state for the pressure oscillations. The gas-liquid volume ratios for the calculated bubble number density of 105 and 108 (/m3) were larger for larger amplitudes and for smaller frequencies. As the amplitude of the pressure oscillation increased with larger bubble number density, the frequency at which the gas-liquid volume ratio reached its maximum value also increased, suggesting that water level changes may be affected by amplitudes and/or frequencies of seismic waves.
We calculated changes of the bubble radius and the gas-liquid volume ratios in the step-like depressurization and pressure oscillation with the numerical simulations, and obtained the increase of bubble radius and gas-liquid volume rations, indicating that bubble nucleation plays an important role in groundwater-level changes. Furthermore, we would combine with models of airlift and the two-phase fluid flow in poroelastic materials to obtain a result which can be compared to observed groundwater-level changes
We have simulated the bubble radius and gas-liquid volume ratios for the step-like depressurization and pressure oscillation in several sets of frequencies, amplitudes, and bubble number densities using bubble growth model from Tisato et al. (2015) to understand relationships between growth of CO2 bubbles and changes of water-level in groundwater.
The step-like depressurization increases the radius of the single bubble monotonously, to the gas-liquid equilibrium. Gas-liquid volume ratios also increased with increasing bubble radii. The bubble radius oscillated and increased monotonically to an equilibrium state for the pressure oscillations. The gas-liquid volume ratios for the calculated bubble number density of 105 and 108 (/m3) were larger for larger amplitudes and for smaller frequencies. As the amplitude of the pressure oscillation increased with larger bubble number density, the frequency at which the gas-liquid volume ratio reached its maximum value also increased, suggesting that water level changes may be affected by amplitudes and/or frequencies of seismic waves.
We calculated changes of the bubble radius and the gas-liquid volume ratios in the step-like depressurization and pressure oscillation with the numerical simulations, and obtained the increase of bubble radius and gas-liquid volume rations, indicating that bubble nucleation plays an important role in groundwater-level changes. Furthermore, we would combine with models of airlift and the two-phase fluid flow in poroelastic materials to obtain a result which can be compared to observed groundwater-level changes