HR: 1340h
AN: H23E-1467    [Abstracts]
TI: BETCO: A Computer Program for the Removal of Barometric and Earth Tide Effects From Water Levels
AU: * Toll, N
EM: njtoll@sandia.gov
AF: Sandia National Laboratories, 4100 National Parks Highway, Carlsbad, NM 88220 United States
AU: * Toll, N
EM: njtoll@sandia.gov
AF: Warnell School of Forest Resources, The University of Georgia, Athens, GA 30602-2152 United States
AU: Rasmussen, T C
EM: trasmuss@uga.edu
AF: Warnell School of Forest Resources, The University of Georgia, Athens, GA 30602-2152 United States
AB: Barometric pressure effects in long-term water level measurements can mask drawdown responses to well tests and natural stimuli. Noise caused by barometric pressure and earth tide effects complicates analysis of pressure response data using diagnostic pressure derivative plots. A computer program has been developed to remove fluctuations in groundwater levels induced by changes in barometric pressure and earth tides. The program implements a regression deconvolution method to obtain a barometric response function and remove the barometric pressure and earth tide effects from the groundwater level data. Using the barometric response function yields a better residual or corrected head than using a constant barometric efficiency. The graphical response function can be used to diagnose aquifer type and well skin effects. A modification of the regression deconvolution has been implemented to simultaneously remove earth tide effects as well as barometric effects on water levels. The removal of the earth tide effects is provided as a beta feature. The software has been applied to 13 water level data sets at the Waste Isolation Pilot Plant in Carlsbad, NM. The results are compared to a constant barometric efficiency correction method. The freeware software is available as an install wizard for Windows XP and 2000. As of submission, all results output from BETCO are considered preliminary, please do not cite. The code is under continued development and will be qualified per the Sandia National Laboratories WIPP Software QA Plan requirements.
This research is funded by WIPP programs administered by the Office of Environmental Management (EM) of the U.S. Department of Energy. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
UR: http://www.hydrology.uga.edu
DE: 1829 Groundwater hydrology
DE: 1843 Land/atmosphere interactions (1218, 1631, 3322)
DE: 1848 Monitoring networks
DE: 1872 Time series analysis (3270, 4277, 4475)
SC: Hydrology [H]
MN: Fall Meeting 2005