Reducing local hydrology from high-precision gravity measurements: a lysimeter-based approach

Details Reducing local hydrology from high-precision gravity measurements: a lysimeter-based approach Reducing local hydrology from high-precision gravity measurements: a lysimeter-based approach

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.183..178c&link_type=abstract

Geophysical Journal International, Volume 183, Issue 1, pp. 178-187.

Physics

Geophysics

3

Time Variable Gravity, Hydrogeophysics, Hydrology, Europe

Scientific paper

Temporal gravimeter observations, used in geodesy and geophysics to study the Earth's gravity field variations, are influenced by local water storage changes (WSC). At the Geodetic Observatory Wettzell (Germany), WSC in the snow pack, top soil, unsaturated saprolite and fractured aquifer are all important terms of the local water budget. In this study, lysimeter measurements are used for the first time to estimate the hydrological influence on temporal gravimeter observations. Lysimeter data are used to estimate WSC at the field scale in combination with complementary observations and a hydrological 1-D model. From these estimated WSC, we calculate the hydrological gravity response. The results are compared to other methods used in the past to correct temporal gravity observations for the local hydrological influence. Lysimeter measurements significantly improve the independent estimation of WSC and thus provide a better way of reducing the local hydrological effect from gravimeter measurements. We find that the gravity residuals are caused to a larger extent by local WSC than previously stated. At sites where temporal gravity observations are used to study geophysical processes beyond local hydrology, the installation of a lysimeter is recommended.

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