American Society of Civil Engineers


Transient Flow into a Partially Penetrating Well during the Constant-Head Test in Unconfined Aquifers


by Ya-Chi Chang, (Postdoctorate, Institute of Environmental Engineering, National Chiao Tung Univ., Hsinchu, Taiwan. E-mail: rachel.ev91g@nctu.edu.tw), Geng-Yuan Chen, (M.S. Student, Institute of Environmental Engineering, National Chiao Tung Univ., Hsinchu, Taiwan. E-mail: sunny0586.ev97g@nctu.edu.tw), and Hund-Der Yeh, (corresponding author), Aff.M.ASCE, (Professor, Institute of Environmental Engineering, National Chiao Tung Univ., Hsinchu, Taiwan E-mail: hdyeh@mail.nctu.edu.tw)

Journal of Hydraulic Engineering, Vol. 137, No. 9, September 2011, pp. 1054-1063, (doi:  http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000392)

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Document type: Journal Paper
Abstract: This study derives a semianalytical solution for drawdown distribution during a 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. In addition, a free-surface condition is used 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 identify the aquifer parameters from the data of the constant-head test when integrated with an optimization scheme or to investigate the effects of vertical flow caused by the partially penetrating well and free-surface boundary in an unconfined aquifer.


ASCE Subject Headings:
Aquifers
Analytical techniques
Wells
Transient flow

Author Keywords:
Unconfined aquifer
Semianalytical solution
Partially penetrating well
constant-head test