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Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method

Short Time Period Water Budget (SPWB) and Catchment Water Balance (CWB) methods were used for estimating evapotranspiration (ET) rates in oil palm catchments in Johor, Malaysia. Three catchments of different oil palm ages were established, namely C1 (2 years), C2 (5 years) and C3 (9 years). Eight mo...

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Main Authors: Yusop, Zulkifli, Chong, Meng Hui, Garusu, Geoffery James, Ayob, Katimon
Format: Article
Language:English
Published: Faculty of Civil Engineering, Universiti Teknologi Malaysia 2008
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/8141/3/ZulkifliYusop2008_EstimationofEvapotransirationinOil.pdf
http://eprints.utm.my/id/eprint/8141/
http://web.utm.my/ipasa/images/stories/MJCE/2008/vol_20_no_2/Dec%202-Zulkifli%20Yusop[1].pdf
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spelling my.utm.81412017-10-23T07:10:05Z http://eprints.utm.my/id/eprint/8141/ Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method Yusop, Zulkifli Chong, Meng Hui Garusu, Geoffery James Ayob, Katimon TA Engineering (General). Civil engineering (General) Short Time Period Water Budget (SPWB) and Catchment Water Balance (CWB) methods were used for estimating evapotranspiration (ET) rates in oil palm catchments in Johor, Malaysia. Three catchments of different oil palm ages were established, namely C1 (2 years), C2 (5 years) and C3 (9 years). Eight months data of rainfall and runoff were used in the analysis. By adopting no rainfall conditions (Pse=0) at the start and end days of analysis, we obtained water budget periods of 209 days for C1, 111 days for C2, and 158 days for C3. A higher Pse of 2 mm, has prolonged the water budget periods to 218, 206 and 195 days for C1, C2 and C3, respectively. The larger Pse (2mm) also increased the number of samples for analysis. The SPWB method showed more consistent monthly ET compared to the WBC method. The projected rates of annual ET show remarkable variations between catchments, from 927 to 1405 mm/yr for the SPWB method and 1098 to 1365 mm/yr for the CWB method. Although the annual ET rates from C1 (1405 mm/yr for SPWB and 1365 mm/yr for CWB) are reasonable, the ET values in C2 and C3 seemed to be grossly underestimated. Both methods have weaknesses in dealing with distinct dry and wet conditions, most likely due to rapid fluctuation in the soil moisture. This problem is more obvious in the smallest catchment, C2 Faculty of Civil Engineering, Universiti Teknologi Malaysia 2008 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/8141/3/ZulkifliYusop2008_EstimationofEvapotransirationinOil.pdf Yusop, Zulkifli and Chong, Meng Hui and Garusu, Geoffery James and Ayob, Katimon (2008) Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method. Malaysian Journal of Civil Engineering, 20 (2). pp. 160-174. ISSN 1823-7843 http://web.utm.my/ipasa/images/stories/MJCE/2008/vol_20_no_2/Dec%202-Zulkifli%20Yusop[1].pdf
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Yusop, Zulkifli
Chong, Meng Hui
Garusu, Geoffery James
Ayob, Katimon
Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
description Short Time Period Water Budget (SPWB) and Catchment Water Balance (CWB) methods were used for estimating evapotranspiration (ET) rates in oil palm catchments in Johor, Malaysia. Three catchments of different oil palm ages were established, namely C1 (2 years), C2 (5 years) and C3 (9 years). Eight months data of rainfall and runoff were used in the analysis. By adopting no rainfall conditions (Pse=0) at the start and end days of analysis, we obtained water budget periods of 209 days for C1, 111 days for C2, and 158 days for C3. A higher Pse of 2 mm, has prolonged the water budget periods to 218, 206 and 195 days for C1, C2 and C3, respectively. The larger Pse (2mm) also increased the number of samples for analysis. The SPWB method showed more consistent monthly ET compared to the WBC method. The projected rates of annual ET show remarkable variations between catchments, from 927 to 1405 mm/yr for the SPWB method and 1098 to 1365 mm/yr for the CWB method. Although the annual ET rates from C1 (1405 mm/yr for SPWB and 1365 mm/yr for CWB) are reasonable, the ET values in C2 and C3 seemed to be grossly underestimated. Both methods have weaknesses in dealing with distinct dry and wet conditions, most likely due to rapid fluctuation in the soil moisture. This problem is more obvious in the smallest catchment, C2
format Article
author Yusop, Zulkifli
Chong, Meng Hui
Garusu, Geoffery James
Ayob, Katimon
author_facet Yusop, Zulkifli
Chong, Meng Hui
Garusu, Geoffery James
Ayob, Katimon
author_sort Yusop, Zulkifli
title Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
title_short Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
title_full Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
title_fullStr Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
title_full_unstemmed Estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
title_sort estimation of evapotranspiration in oil palm catchments by short-time period water-budget method
publisher Faculty of Civil Engineering, Universiti Teknologi Malaysia
publishDate 2008
url http://eprints.utm.my/id/eprint/8141/3/ZulkifliYusop2008_EstimationofEvapotransirationinOil.pdf
http://eprints.utm.my/id/eprint/8141/
http://web.utm.my/ipasa/images/stories/MJCE/2008/vol_20_no_2/Dec%202-Zulkifli%20Yusop[1].pdf
_version_ 1643644927498780672
score 13.211869

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