HR: 0830h
AN: H31B-0465    [PDF]
TI: Monitoring Soil Water Dynamics in the Vadose Zone During Pumping With Ground Penetrating Radar
AU: * Ferre, T P
EM: ty@hwr.arizona.edu
AF: University of Arizona, 1133 E. North Campus Drive, Tucson, AZ 85721-0011 United States
AU: Von Glinski, G
EM: gvonglin@hwr.arizona.edu
AF: University of Arizona, 1133 E. North Campus Drive, Tucson, AZ 85721-0011 United States
AB: Transient water movement within the vadose zone has profound effects on the response of unconfined aquifers to pumping. Much has been published regarding the interpretation of unconfined pumping tests. However, there remains a debate regarding the relative contribution of delayed drainage to the observed aquifer response. Some of the source of this ongoing debate is the lack of sufficiently convincing data to quantify the magnitude and extent of delayed drainage. We used borehole ground penetrating radar to provide exceptionally high spatial and temporal monitoring of soil water dynamics in the vadose zone during pumping. Results show the precise evolution of water content profiles. These profiles confirm the presence of significant delayed drainage. However, the resulting profiles are not well predicted by current numerical flow models. Does this point to another, poorly described mechanism that may control the response of unconfined aquifers?
DE: 0634 Measurement and standards
DE: 0694 Instrumentation and techniques
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2003 Fall Meeting