Since the 1980s, the distributed optical fiber temperature measurement
technology has gradually carried out to be the long-distance,
high-precision and long-time temperature measurement, and is more and
more used in many fields such as fire warning, leakage monitoring, etc.
Since the 21st century, scholars in the field of hydrogeology have used
this technology to understand the heat transfer in groundwater, surface
water and other media. In this study, the distributed optical fiber
temperature measurement technology was used to measure the vertical
temperature of groundwater in the downstream of Huangbizhuang Reservoir
in North China Plain for 35 sites, and groundwater table has been
measured too. On the base of the temperature data, the plane and
vertical distribution of the groundwater temperature are obtained. The
plane distribution of the groundwater temperature shows that the
reservoir water of Huangbizhuang Reservoir recharges the groundwater in
the downstream plain area through the seepage at the bottom of the
auxiliary dam, and the isotherm is roughly parallel to the groundwater
contour, which shows that the conclusion of this technology is reliable.
And according to the vertical temperature distribution, the main
recharge depth is about 23 and 28 m underground. And the points of
seepage are indicated by temperature change inside the dam and the
drainage ditch.