Laplace-domain solution for transient flow into a partially penetrating well in unconfined aquifers under the constant-head test
|關鍵字:||地下水;非侷限含水層;部分貫穿;定水頭試驗;Groundwater;Unconfined aquifer;partially penetrating well;constant-head test|
The constant head test is to keep constant water level in the pumping well while the drawdown into the observed well is measured. This study derives a semi-analytical solution for drawdown distribution during constant-head test at a partially penetrating well in an unconfined aquifer. The constant-head condition is used to describe the boundary along the screen while no-flow condition is employed to describe the boundary along the casing of the well. In addition, a free surface condition is utilized to delineate the upper boundary of the unconfined aquifer. The Laplace domain solution is then derived using separation of variables and Laplace transform. This solution can be used to produce the curves of dimensionless drawdown versus dimensionless time to investigate the effects of vertical-flow caused by the partially penetration well and free surface boundary in an unconfined aquifer or to identify the aquifer parameters from the data of constant-head test.
|Appears in Collections:||Thesis|
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