| Author | Rajaratnam, Lakshman Rajakumar |
| Call Number | AIT Thesis no. WA-84-16 |
| Subject(s) | Runoff--Mathematical models
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The main objective of this study is to optimize the parameters of a storage function model which includes a nonlinear storage function model for surface flow and linear storage function model for subsurface flow.
These parameters could be related to the physical characteristics of the storm and basin. A four-parameter storage function model for surface flow
and a five-parameter storage function model including three infiltration parameters for subsurface flow using Horton's infiltration equation are
combined and used for the optimization of the nine parameters with observed
discharges of daily flows. The study confines for small watersheds with the assumption that surface and subsurface flow start simultaneously at
the beginning of the storm.
A Newton-Raphson algorithm coupled with sensitivity analysis is used in the optimization technique. The sensitivity analysis includes techniques
of the principal components regression. The parameters are optimized using the above technique for both discharge and storage with realistic initial
values chosen.
The proposed model with nine parameters can be applied satisfactorily to a actual system if realistic initial values of parameter and the time at
which infiltration ceases are known. But in practice this is impossible as the time at which infiltration ceases is not known . The proposed model with
known infiltration can be applied satisfactorily to an actual system to optimize six parameters |
| Year | 1983 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Hoshi, Kiyoshi
; |
| Examination Committee(s) | Gupta, Ashim Das ;Yoganarashimhan , G.N.
; |
| Scholarship Donor(s) | The Royal Netherlands Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1983 |