HR: 1330h
AN: H12D-1012    [PDF]
TI: Time Series Analysis of In-situ Gravity Data in the Context of Hydro-meteorological Variability
AU: Troch, P A
EM: Peter.Troch@wur.nl
AF: Hydrology and Quantitative Water Management Group, Department of Environmental Sciences, Wageningen University, Nieuwe Kanaal 11, Wageningen, 6709 PA Netherlands
AU: * Hasan, S
EM: Shaakeel.Hasan@wur.nl
AF: Hydrology and Quantitative Water Management Group, Department of Environmental Sciences, Wageningen University, Nieuwe Kanaal 11, Wageningen, 6709 PA Netherlands
AB: The Global Geodynamics Project (GGP) began in 1997 to record the earth's gravity field with high accuracy at a number of worldwide stations using superconducting gravimeters (SG). This data is being used in an extensive set of studies of the earth, ranging from global motions of the whole earth to the gravity effects of atmospheric pressure and groundwater. The new generation in-situ gravimeters and NASA's Gravity Recovery and Climate Experiment (GRACE) promise the possibility of tracking the movement of the water on and beneath the earth surface. Detecting hydrological effect on gravity time series is not only interesting for geodynamic or geophysical researches, but also promising for the hydrologists, in closing the water balance. Therefore a research programme was started with the general aim to investigate the possibility of detecting the variations in river basin water storage from both in-situ and satellite gravity measurements. The first part of the research is to deal with in-situ gravity data. To assess the hydrological effect on time variation in in-situ gravity signals water balance models can be used to trace hydrological changes in time in the vicinity of the station. The water balance model obviously has to deal with all relevant hydrological processes in the area. As a first step towards the construction of the hydrological model time series analysis is applied to available hydro-meteorological and gravity data. The data used in this analysis is from Moxa Geodynamic Observatory in Germany and it includes precipitation, ground water, air pressure and temperature, wind speed, and humidity along with gravity residuals. This paper describes first results of this analysis and draws conclusions about theoretically detectable hydrological effect on gravity signal and practical requirements for model building.
DE: 1899 General or miscellaneous
SC: Hydrology [H]
MN: 2003 Fall Meeting