Journal of Environmental Hydrology
ISSN 1058-3912
Electronic Journal of the International Association for Environmental Hydrology
JEH Volume 12 (2004), Paper 19    Posted October 29, 2004
NUMERICAL SOLUTION FOR TRANSIENT WELL FLOW IN AN UNCONFINED-CONFINED AQUIFER SYSTEM

Dwi Tjahjanto
Department of Civil Engineering
University of Merdeka Malang, Malang, Indonesia

Amir Hashim Mohd. Kassim
Department of Civil Engineering
College University Technology of Tun Hussein On (KUITTHO)
Batupahat, Malaysia


ABSTRACT
It is quite common that the extraction of groundwater is from more than one aquifer system, where a combination of unconfined and confined aquifers is found. The problem lies in how to find the discharge from each of the aquifers, whether or not it is unconfined or confined in nature. The governing equations, which are second order partial differential equations, are solved numerically using a finite difference method. To obtain a solution, computer code has been written in MATLAB, and a program has been developed. The layered aquifer is idealized as an unconfined-confined aquifer system including the well in which the solution domain is stated to be two-dimensional. This method has yielded the relationship between drawdown and time in the well, and is also able to determine the discharge from each of the aquifers, whether unconfined or confined.
Reference: Tjahjanto, D. and A.H. Mohd. Kassim; Numerical Solution for Transient Well Flow in
an Unconfined-Confined Aquifer System, Journal of Environmental Hydrology, Vol. 12, Paper 19, October 2004.
CONTACT:

Dwi Tjahjanto, Ph.D.
Department of Civil Engineering
University of Merdeka Malang
Jl. Terusan Raya Dieng 62-64
Malang
Indonesia



E-mail:dwi_to@yahoo.com
Return to HydroWeb Homepage