A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed

A procedure for estimating the impact of CO2-induced climate and vegetation changes on actual evapotranspiration (ET), soil moisture and water yield in a humidtropical vegetated watershed was proposed and evaluated. A distributed parameter modelling approach was used whereby a watershed was subdi...

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Main Author:	Nabi, Amjad
Format:	Thesis
Language:	English English
Published:	1998
Subjects:	Hydrological models - Climatic changes - Evapotranspiration - Case studies
Online Access:	http://psasir.upm.edu.my/id/eprint/10125/1/FK_1998_6_A.pdf
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id	my-upm-ir.10125
record_format	uketd_dc
spelling	my-upm-ir.101252011-03-10T00:55:25Z A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed 1998-01 Nabi, Amjad A procedure for estimating the impact of CO2-induced climate and vegetation changes on actual evapotranspiration (ET), soil moisture and water yield in a humidtropical vegetated watershed was proposed and evaluated. A distributed parameter modelling approach was used whereby a watershed was subdivided into relatively homogeneous ground response units (GRUs) to provide distributed parameter capabilities. A distributed parameter ET submodel was developed based on a biophysical approach for simulating actual evapotranspiration from a watershed with closed canopy cover of natural and planted vegetation. The hydrologic model, called humid tropical vegetation climate hydrologic model (HTVCHM), was developed by incorporating this ET submodel. Leaf area index (LA!) was used in the model as a measure of vegetation structure and to quantify energy and mass exchange of canopies. The potentials of Landsat TM image was studied for LA! estimation using vegetation-index (VI) of rainforest, rubber and oil palm plantation. Canopy conductance (reciprocal of resistance) was also an important vegetative parameter which was included to represent CO2-induced changes in vegetation. A procedure was presented and evaluated for subdividing a watershed into GRUs through the application of an unsupervised pattern recognition algorithm in conjunction with topographic data to Landsat Thematic Mapper (TM) data in a GIS environment. To conduct the sensitivity analyses, climate and vegetation change scenarios were proposed based on the GCM prediction for this region and information from the literature. The procedure developed in this research is an effective and practical integrated approach to modelling the effects of climate and vegetation changes on the hydrologic response of watershed in this region. This procedure was applied and evaluated on the Trolak watershed of the Bernam River basin with a wet humid tropical climate and located in the south-east of Perak State of West Malaysia. Hydrological models - Climatic changes - Evapotranspiration - Case studies 1998-01 Thesis http://psasir.upm.edu.my/id/eprint/10125/ http://psasir.upm.edu.my/id/eprint/10125/1/FK_1998_6_A.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Hydrological models - Climatic changes - Evapotranspiration - Case studies Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Hydrological models - Climatic changes - Evapotranspiration - Case studies
spellingShingle	Hydrological models - Climatic changes - Evapotranspiration - Case studies Nabi, Amjad A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
description	A procedure for estimating the impact of CO2-induced climate and vegetation changes on actual evapotranspiration (ET), soil moisture and water yield in a humidtropical vegetated watershed was proposed and evaluated. A distributed parameter modelling approach was used whereby a watershed was subdivided into relatively homogeneous ground response units (GRUs) to provide distributed parameter capabilities. A distributed parameter ET submodel was developed based on a biophysical approach for simulating actual evapotranspiration from a watershed with closed canopy cover of natural and planted vegetation. The hydrologic model, called humid tropical vegetation climate hydrologic model (HTVCHM), was developed by incorporating this ET submodel. Leaf area index (LA!) was used in the model as a measure of vegetation structure and to quantify energy and mass exchange of canopies. The potentials of Landsat TM image was studied for LA! estimation using vegetation-index (VI) of rainforest, rubber and oil palm plantation. Canopy conductance (reciprocal of resistance) was also an important vegetative parameter which was included to represent CO2-induced changes in vegetation. A procedure was presented and evaluated for subdividing a watershed into GRUs through the application of an unsupervised pattern recognition algorithm in conjunction with topographic data to Landsat Thematic Mapper (TM) data in a GIS environment. To conduct the sensitivity analyses, climate and vegetation change scenarios were proposed based on the GCM prediction for this region and information from the literature. The procedure developed in this research is an effective and practical integrated approach to modelling the effects of climate and vegetation changes on the hydrologic response of watershed in this region. This procedure was applied and evaluated on the Trolak watershed of the Bernam River basin with a wet humid tropical climate and located in the south-east of Perak State of West Malaysia.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nabi, Amjad
author_facet	Nabi, Amjad
author_sort	Nabi, Amjad
title	A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
title_short	A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
title_full	A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
title_fullStr	A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
title_full_unstemmed	A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed
title_sort	hydrologic model for studying the climate change impact on evapotranspiration and water yield in a humid tropical watershed
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	1998
url	http://psasir.upm.edu.my/id/eprint/10125/1/FK_1998_6_A.pdf
_version_	1747811052437897216

A Hydrologic Model for Studying the Climate Change Impact on Evapotranspiration and Water Yield in a Humid Tropical Watershed

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