Modelling Evaporation and Evapotranspiration under Temperature Change in Malaysia
Temperature change has a direct effect on hydrology through its link with evapotranspiration. The potential impact of temperature change on the evapotranspiration is assessed; using a modelling approach based on a few physical weather measurements. Methods to estimate free-surface evaporation E and...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
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Universiti Putra Malaysia Press
2000
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3552/ http://psasir.upm.edu.my/id/eprint/3552/1/Modelling_Evaporation_and_Evapotranspiration.pdf |
| _version_ | 1848839561785901056 |
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| author | Ali, Md. Hazrat Shui, Lee Teang Yan, Kwok Chee Eloubaidy, Aziz F. |
| author_facet | Ali, Md. Hazrat Shui, Lee Teang Yan, Kwok Chee Eloubaidy, Aziz F. |
| author_sort | Ali, Md. Hazrat |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Temperature change has a direct effect on hydrology through its link with evapotranspiration. The potential impact of temperature change on the evapotranspiration is assessed; using a modelling approach based on a few
physical weather measurements. Methods to estimate free-surface evaporation E and potential evapotranspiration ETp ' without any model calibration
p~parameters, for monthly time series are presented. The model results are calculated by using observed average historic (1980-97) meteorological data
and compared with USBR Class-A black pan evaporation data (1971-97) from the Muda Agricultural Development Authority, Malaysia. The long-term monthly
averaged daily estimates of Ep for different months were compared with measured pan evaporation. Results of this simulation showed an accuracy of
more than 95% with the observed pan evaporation data and thus, would be used for ET estimation. All the model equations containing temperature terms
were set dependent of temperature. The correlation between mean monthly relative humidity and temperature was also made to investigate the sensitivity
of ETp ' The ETp time series is perturbed by varying monthly temperature from 21"C to 41"C, with O.2"C increment to investigate the sensitivity of that series.
Results from the perturbations showed that the temperature has significant effects on ET for each month.
p |
| first_indexed | 2025-11-15T07:13:25Z |
| format | Article |
| id | upm-3552 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:13:25Z |
| publishDate | 2000 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-35522013-05-27T07:09:24Z http://psasir.upm.edu.my/id/eprint/3552/ Modelling Evaporation and Evapotranspiration under Temperature Change in Malaysia Ali, Md. Hazrat Shui, Lee Teang Yan, Kwok Chee Eloubaidy, Aziz F. Temperature change has a direct effect on hydrology through its link with evapotranspiration. The potential impact of temperature change on the evapotranspiration is assessed; using a modelling approach based on a few physical weather measurements. Methods to estimate free-surface evaporation E and potential evapotranspiration ETp ' without any model calibration p~parameters, for monthly time series are presented. The model results are calculated by using observed average historic (1980-97) meteorological data and compared with USBR Class-A black pan evaporation data (1971-97) from the Muda Agricultural Development Authority, Malaysia. The long-term monthly averaged daily estimates of Ep for different months were compared with measured pan evaporation. Results of this simulation showed an accuracy of more than 95% with the observed pan evaporation data and thus, would be used for ET estimation. All the model equations containing temperature terms were set dependent of temperature. The correlation between mean monthly relative humidity and temperature was also made to investigate the sensitivity of ETp ' The ETp time series is perturbed by varying monthly temperature from 21"C to 41"C, with O.2"C increment to investigate the sensitivity of that series. Results from the perturbations showed that the temperature has significant effects on ET for each month. p Universiti Putra Malaysia Press 2000 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3552/1/Modelling_Evaporation_and_Evapotranspiration.pdf Ali, Md. Hazrat and Shui, Lee Teang and Yan, Kwok Chee and Eloubaidy, Aziz F. (2000) Modelling Evaporation and Evapotranspiration under Temperature Change in Malaysia. Pertanika Journal of Science & Technology, 8 (2). pp. 191-204. ISSN 0128-7680 English |
| spellingShingle | Ali, Md. Hazrat Shui, Lee Teang Yan, Kwok Chee Eloubaidy, Aziz F. Modelling Evaporation and Evapotranspiration under Temperature Change in Malaysia |
| title | Modelling Evaporation and Evapotranspiration
under Temperature Change in Malaysia |
| title_full | Modelling Evaporation and Evapotranspiration
under Temperature Change in Malaysia |
| title_fullStr | Modelling Evaporation and Evapotranspiration
under Temperature Change in Malaysia |
| title_full_unstemmed | Modelling Evaporation and Evapotranspiration
under Temperature Change in Malaysia |
| title_short | Modelling Evaporation and Evapotranspiration
under Temperature Change in Malaysia |
| title_sort | modelling evaporation and evapotranspiration
under temperature change in malaysia |
| url | http://psasir.upm.edu.my/id/eprint/3552/ http://psasir.upm.edu.my/id/eprint/3552/1/Modelling_Evaporation_and_Evapotranspiration.pdf |