id	keyword
gc-853	n.d
gc-853	water
gc-853	soil
gc-853	soil water
gc-853	groundwater
gc-853	recharge
gc-853	phase
gc-853	zone
gc-853	δ18o
gc-853	velocity
gc-853	depth
gc-853	isotope
gc-853	precipitation
gc-853	kumamoto
gc-853	area
gc-853	rate
gc-853	flow
gc-853	core