| Author | Piyasena, Wije Munige |
| Call Number | AIT Diss. no. GT-82-01 |
| Subject(s) | Water, Underground--Thailand--Bangkok--Artificial recharge
|
| Note | A dissertation submitted in partial fulfilment of the
requirements for the degree of Doctor of Engineering. School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Possibility of restoring the piezometric heads in a
multiaquifer system through artificial recharge is
investigated. A finite difference model allowing for nonuniform grid spacing and time steps is developed to simulate the piezometric head changes in the system.
Aquitard storage is considered only in the estimation of
their head changes. A finite difference linear programming
model to obtain hydrodynamically optimum locations and rates of recharge for an aquifer is formulated. Extension of the model to a multiaquifer system is attempted. Analytical solution for the steady state hydraulics of a recharge canal which may or may not penetrate a confined aquifer is derived using conformal mapping. Formulas to estimate the recharge
rates for various well recharging cases are given. A finite
difference model is developed to analyze the two dimensional
steady state groundwater flow and is used to investigate the
flow rate into a lower aquifer through an aquitard gap. In
an attempt to rehabilitate the depleted aquifer system in
Bangkok which is subsiding at an alarming rate, a series of
horizontal sections prepared at different depths are used to
delineate the stratigraphy in detail. The finite difference
linear programming model is then used to find the optimum
locations and rates of recharging for each aquifer and the behavior of the multiaquifer system under optimum and near
optimum recharging schemes is analyzed using the
multiaquifer model. Results show tahat the piezometric
heads at centers of cones of depressions of Bangkok, Phra
Pradaeng and Nakhon Luang aquifers can b e raised by 12m, 14m and 24m respectively within a two-year period through recharging at a rate lower than the present withdrawal rate. If further development of groundwater extraction is banned,
piezometric heads in aquifers may eventually stabilize at
levels little lower than present levels, within a two-year
period. |
| Year | 1982 |
| Type | Dissertation |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Prinya Nutalaya ; Hosking, R. J.
|
| Examination Committee(s) | Arbhabhirama Anat ; Ohta, H. ; Gupta, Ashim Das ; Tomiolo, A.
|
| Scholarship Donor(s) | Government of Japan |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1982 |