International Rainwater Catchment Systems Conference
Catchment: An Answer to the Water Scarcity of the Next Millennium."
Petrolina, Brazil - July 1999
Section 12: Posters
Temperature Survey for Detecting the Groundwater Vein-Stream
Atsuo Takeuchi & GenFuyuya
Disaster Prevention Research Institute
Kyoto University, Gokasho Uji-city Kyoto Pref.Japan, 611-0011
It is known that rainwater infiltrating into soil tends to
drop infiltrating velocity to the vertical direction and tends to flow
horizontally when it reaches an unpermeable layer. Therefore it is necessary to
determine exactly the location and depth of the groundwater vein stream flowing
above the unpermeable layer for effectively using groundwater.
In order to accomplish this, an electric resistivity survey
and an electric logging have been carried out. The information on the location
of the groundwater is obtained by these methods. It is very difficult though to
obtain information on the location and depth of flowing groundwater in vein
The authors developed an underground temperature survey
method to detect the accurate information on groundwater vein stream. This
method uses the difference between temperature of flowing groundwater and
ground temperature of a shallow layer. It is composed of a one-meter- depth
temperature survey, a multiple point's temperature logging and/or usual
temperature logging, and a flowing direction and a velocity measurement.
The groundwater investigation method utilizing temperature
is extensively used for research of groundwater vein-streams in landslide
areas, underflows, groundwater disasters, groundwater obstructions and
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