TY - ABST

T1 - Calibrating vadose zone models with time-lapse gravity data: a forced infiltration experiment

AU - Christiansen, Lars

AU - Hansen, Allan Bo

AU - Zibar, Majken Caroline Looms

AU - Haarder, Eline Bojsen

AU - Binning, Philip John

AU - Rosbjerg, Dan

AU - Andersen, Ole Baltazar

AU - Bauer-Gottwein, Peter

PY - 2010

Y1 - 2010

N2 - A change in soil water content is a change in mass stored in the subsurface, and when large enough, can be measured with a gravity meter. Over the last few decades there has been increased use of ground-based time-lapse gravity measurements to infer hydrogeological parameters. These studies have focused on the saturated zone, with specific yield as the most prominent target parameter and with few exceptions, changes in storage in the vadose zone have been considered as noise. Here modeling results are presented suggesting that gravity changes will be measureable when soil moisture changes occur in the unsaturated zone. These results are confirmed by field measurements of gravity and georadar data at a forced infiltration experiment conducted over 14 days on a grassland area of 10 m by 10 m. An unsaturated zone infiltration model can be calibrated using the gravity data with good agreement to the field data. The potential for gravity data to be used for the calibration of unsaturated zone model parameters is discussed.

AB - A change in soil water content is a change in mass stored in the subsurface, and when large enough, can be measured with a gravity meter. Over the last few decades there has been increased use of ground-based time-lapse gravity measurements to infer hydrogeological parameters. These studies have focused on the saturated zone, with specific yield as the most prominent target parameter and with few exceptions, changes in storage in the vadose zone have been considered as noise. Here modeling results are presented suggesting that gravity changes will be measureable when soil moisture changes occur in the unsaturated zone. These results are confirmed by field measurements of gravity and georadar data at a forced infiltration experiment conducted over 14 days on a grassland area of 10 m by 10 m. An unsaturated zone infiltration model can be calibrated using the gravity data with good agreement to the field data. The potential for gravity data to be used for the calibration of unsaturated zone model parameters is discussed.

M3 - Conference abstract for conference

Y2 - 29 November 2010

ER -