dc.description.abstract | In order to investigate and remediate the aquifer below a building, a slant well at the perimeter of the building is installed and reaches the target aquifer. While drilling slant well, the dipole flow test can measure many parameters more easily such as aquifer hydro geological parameters, estimation of groundwater flow field, bottom boundary of the aquifer, etc. If the aquifer is thin, drilling fully penetrating well will be successful. However, thick aquifer will make drilling entire fully penetrating well more difficult and costly. Therefore, this project wants to discuss the effect from bottom boundary on dipole flow test in a slant partially penetrating well. The slant well is isolated by using a double-packer into two screen sections of equal length. In the upper section, a constant rate pumping is carried out and the withdrawn water is immediately discharge into the lower section, which can create a steady circulation flow field. This study derives the slant well to conduct the dipole flow test in steady state model. It obtains the solution of finite thickness and semi-infinite thickness in confined and unconfined aquifer. In confined aquifer case, when the distance from the lower section to the lower boundary more than 0.36 times the thickness of the aquifer, the models same with limited thickness and semi-infinite thickness. The influence of the lower boundary can be ignored. In unconfined aquifer case, because it do not consider the time change, the water table boundary conditions for the constant head. The result is the same as confined aquifer. | en_US |