HR: 1340h
AN: H53A-1193    [Abstracts]
TI: Incorporating Real Time Fiber Optic Detection into a Newly Developed in-situ Passive Groundwater Contaminant Flux Meter
AU: * Wang, H
EM: whuaguo@ifas.ufl.edu
AF: Soil and Water Science Department University of Florida, 2169 McCarty Hall, Gainesville, FL 32611 United States
AU: Jawitz, J W
EM: jwjawitz@ifas.ufl.edu
AF: Soil and Water Science Department University of Florida, 2169 McCarty Hall, Gainesville, FL 32611 United States
AB: Quantification of contaminant mass flux is essential for characterizing the risks to humans and the environment from groundwater contaminants. Traditionally, the contaminant mass flux has been indirectly obtained by integrating point contaminant concentrations. A new passive contaminant flux meter (PFM) that can simultaneously measure the contaminant mass flux as well as the ground water flux at the same location has been recently introduced. It is expected that the system can significantly increase the accuracy of contaminant flux estimation when temporal or spatial variability of water flux exists. Here, in-situ, real time fiber optic measurements are incorporated into the PFM. Fluorescent dyes are applied as tracers in the permeable matrix of a PFM. Water flux is quantified by measuring the dye behavior by a fiber optic sensor. Both excitation and emission light are carried in and out the sensor through optic fibers. Signal analysis is conducted using a miniature fiber optic spectrometer that is driven and controlled by a notebook computer, enabling real-time, in-situ field measurement.
DE: 1800 HYDROLOGY
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting