Determination of Three-Dimensional Aquifer Anisotropy of an Unconfined Aquiferunder Partially Penetrating Pumping Conditions

摘要

Field and theoretical investigations were made to study the three-dimensionalhydraulic conductivity anisotropy of an unconfined aquifer. A well field, consisting of three multilevel samplers/piezometers (MLSP), ten fully screened observation wells, and two pumping wells, was developed in the Sevilleta Wildlife Refuge, north of New Mexico Tech. The MLSP can give depth-specific drawdown and groundwater samples for the three-dimensional analysis. The fully screened observation well can yield vertically averaged drawdown and groundwater samples for the two-dimensional analysis. The three-dimensional aquifer anisotropy is characterized using the depth-specific drawdown data and a method based on the Laplace-Hankel (L-H) domain solution of a pertinent three-dimensional unconfined well hydraulics theory. Also, a mapping function technique was developed to diagnose the drawdown data.