| Author | Rahman, Md. Mazibur |
| Call Number | AIT Thesis no. AE-86-07 |
| Subject(s) | Plants--Transpiration
|
| Note | A research study 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 | The study was conducted at the Asian Institute of technology,
Bangkok, Thailand in 1986. Two lysimeters of size 1mx1m with the mariotte
system designed according to TOMAR & O'TOOLE (1980) was used to measure
evapotranspiration, while evaporation & transpiration was measured using a
thin (1mm) transparent PVC tray on the lysimeter. Net radiation and reflected radiation was measured above the crop. All other climatic parameters
were available from the agrometeorological station situated at the site.
The full cover albedo of rice at 14 °04' North and 100° 44' East in
Thailand using exponential relationship was 0.22, that of water surface as
0.08 , and the extinction coefficient for albedo as 0.618. The combination
model was used to develop model for evaporation and transpiration with the
inclusion of estimated correction factor in the wind function of PENMAN
(1954, as cited in PENMAN, 1956) for evaporation from water surface, and on
the wind function of STIGTER (1980) for transpiration from the canopy. For
the period of LAI < 3. 0 a linear relationship varying from 0 to 0. 75 for
transpiration, 1 to 0.32 for evaporation were used on the basis of LAI to
calculate the correction terms in both the wind functions. And for LAI ~
3.0 both the correction terms were estimated to be constant; 0.32 for evaporation and 0.75 for transpiration. The estimated E was within 1mm of E
observed during the initial period, thought to be associated with the error
in measurement of evaporation while the evaporation in the later period could
be estimated within 0.2mm of accuracy. Estimated T was higher In the initial
period by 1mm on average and later within 0.5mm. Finally ET could be estimated within o.5mm accuracy on average. |
| Year | 1986 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jensen, Jens Raunso |
| Examination Committee(s) | Nielsen, Jens Moller ;Rahman, Md. Ataur |
| Scholarship Donor(s) | DAAD, FRG . |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1986 |