Critical surface coning due to a line sink in a vertical drain containing a porous medium

Abstract

The withdrawal of water with a free surface through a line sink from a two-dimensional, vertical sand column is considered using the hodograph method and a novel spectral method. Hodograph solutions are presented for slow flow and for critical, limiting steady flows, and these are compared with spectral solutions to the steady problem. The spectral method is then extended to obtain unsteady solutions and hence the evolution of the phreatic surface to the steady solutions when they exist. It is found that for each height of the interface there is a unique critical coning value of flow rate, but also that the value obtained is dependent on the flow history.
 
 doi:10.1017/S1446181119000099

Modelling of Withdrawal of a Stratified Fluid From a Porous Medium

“…The understanding gained in this work is important to issues of water quality in stratified aquifers. Some of the results of this research have been published in [1].…”