| Author | Jerasak Premchitt |
| Call Number | AIT Diss. no.D37 |
| Subject(s) | Subsidences (Earth movements)--Thailand--Bangkok
|
| Note | A dissertation submitted in partial fulfilment of the requirements for the degree of Doctor of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | This dissertation is concerned with the development and use of a finite difference mathematical model for the simulation of the phenomenon of land subsidence due to ground water withdrawal. The work consists of the two separate parts: (i) theoretical analysis of the piezometric pressure declines and rates of compression of the idealized units which comprise the basic components of a multi-aquifer system, and (ii) development of a full mathematical model for the simulation of the subsidence process, and the application of this model to the Bangkok area. The theoretical analysis employs an axi-symmetric hydrologic model together with a one-dimensional consolidation model. The behaviour of idea- lized clay layer-aquifer systems under time-dependent pumping rates was extensively investigated. unique time-drawdown and time-compression relationships were established. From this analysis' the integro-differential equation governing the behaviour of multiaquifer systems was derived,and it was found to correSpond with past work. A simple approximate technique for the prediction of subsidence was also derived from this analysis, and this gave satisfactory results as compared with the full model predictions. The composite model for subsidence prediction consists of a 'quasi- three-dimensional' hydrologic model and a one-dimensional consolidation model. A parametric study was carried out to assess the significance of the various model parameters. The model was then used to simulate the phenomenon of land subsidence in the Bangkok area,-and this demonstrated its power and flexibility. 0n the basis of the available information, the subsidence in central Bangkok was predicted to have been 0.76 m in 1975, with a total pumping rate of 600,000 m [day from the upper four aquifers. Predictions of subsidence to 1995 were also carried out for several assumed future pumping schemes. The prediction for the most severe pumping scheme was in excess of two metres in 1995 |
| Year | 1978 |
| Type | Dissertation |
| School | AIT Publication (Year <=1978) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Dissertation (D) (Year <=1978) |
| Chairperson(s) | Brand, E.W. |
| Examination Committee(s) | Arbhabhirama, Anat;Balasubramaniam, A.S.;Prinya Notalaya;Selvalingam, S. |
| Scholarship Donor(s) | Government of Canada |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1978 |