| Author | Khan, Shaukat |
| Call Number | AIT Thesis no.AE-79-04 |
| Subject(s) | Evaporative power--Punjab--Computer programms
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study describes the development of a computer simulation model for daily mean potential evapo-transpiration (PET) on weekly basis. The daily
potential evapotranspiration data was estimated, using the modified Penman equation, from 56-years of historical hydro meteorological data collected
at a station located in the study area. The model was developed, primarily, based on the assumption that little seasonal variation occurs during a week.
But during the course of the model development, it was found that the occurrence of an isolated rainy day or a sequence of rainy days during a week
is important. However, the amount of rainfall has no significant effect on PET.
One important outcome of this study is that the PET as a random variable for any week of year, is normally distributed and the weekly means of these distributions have a deterministic relationship. with the respective
weeks of the year. The model makes use of these properties of PET in generating the data for any number of years. It is flexible enough to encompass the seasonal variations that occur during a week due to rainfall.
For studying a complete crop production system, this PET model can be used as component of an over all crop environmental model describing the inputs of rainfall, evapo-transpiration and soil moisture variations with depth.
A mathematical model of soil moisture storage and its variation with depth is also proposed in this study. The validity of this second model
can be tested when the appropriate data required to tune the model becomes
available. |
| Year | 1979 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Singh, Gajendra
; |
| Examination Committee(s) | Early, Alan C. ;Jordan, J.A. ;Selvalingam, Selvadore
; |
| Scholarship Donor(s) | The Government of Norway; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1979 |