Korea Institute of Geoscience and Mineral Resources

Korea Institute of Geoscience and Mineral Resources (kigam)

Heejun Suk

Kyoochul Ha

Dong-Chan Koh

Jang-Hee Han

Provided is a sensor for measuring water levels of groundwater and surface water using magnetostriction displacement and multi measurement system for groundwater and surface water by using the same. The sensor includes an outer case having a hollow space therein and extending in a longitudinal direction, a magnetostriction line spaced apart from an inner wall in the hollow space of the outer case to extend in the longitudinal direction, a floating permanent magnet guided along the magnetostriction line to be movable in the longitudinal direction, the floating permanent magnet being changed in position to correspond to a water level; and a transceiver applying a current pulse into the magnetostriction line to receive an elastic wave that is generated while first magnetic fields formed in a circumferential direction of the magnetostriction line by the current pulse crosses a second magnetic fields formed in an axial direction of the magnetostriction line by the permanent magnet.

Sensor for measuring water levels of groundwater and surface water using magnetostriction displacement and multi measurement system for groundwater and surface water by using the same

Disclosed is a method of seeking semianalytical solutions to multispecies transport equations coupled with sequential first-order network reactions under conditions wherein a groundwater flow velocity and a dispersion coefficient vary spatially and temporally and boundary conditions vary temporally. This invention provides a method of seeking semianalytical solutions to dechlorination equations coupled with sequential first-order reactions, wherein analytical solutions to complex problems such as inhomogeneous media and unsteady flow are derived by combining a similarity transformation method of Clement and a generalized integral-transform technique (GITT), and are verified through comparison with 2DFATMIC which is a commercial numerical program, and thereby can be utilized in nuclear waste sites contaminated with radioactive materials and decayed daughter nuclides and industrial complexes contaminated with chlorinated organic solvents such as PCE (tetrachloroethene), TCE (trichloroethene) and biodegradable byproducts thereof, and can also be widely used in verification of developed numerical programs.

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Daejeon, South Korea

Heejun Suk