Characterization of convective rain in Klang Valley, Malaysia

Storms of convective origin are generally known to be responsible for most of flash flood events in Malaysia. Flood problems are aggravated by rapid urbanization which modified the hydrological processes of a catchment. This study is aimed to evaluate the characteristic of convective rain in Klang V...

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Main Author:	Ahmad, Nordila
Format:	Thesis
Language:	English
Published:	2008
Subjects:	TC Hydraulic engineering Ocean engineering
Online Access:	http://eprints.utm.my/id/eprint/9578/1/NordilaAhmadMFKA2008.pdf
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id	my-utm-ep.9578
record_format	uketd_dc
spelling	my-utm-ep.95782018-06-29T21:50:59Z Characterization of convective rain in Klang Valley, Malaysia 2008-12 Ahmad, Nordila TC Hydraulic engineering. Ocean engineering TA Engineering (General). Civil engineering (General) Storms of convective origin are generally known to be responsible for most of flash flood events in Malaysia. Flood problems are aggravated by rapid urbanization which modified the hydrological processes of a catchment. This study is aimed to evaluate the characteristic of convective rain in Klang Valley. The characteristics are based on short rainfall interval data between years 2000 and 2004. The convective events were analysed in terms of timing and spatial distribution. The spatial distributions of convective rainfall, derived from meteorological radar data and those observed on the ground are compared. Convective storm occurred most frequently during intermonsoon months which made up about 44%. A variety of storm shape is evident. Most of the convective events occurred over short durations. The convective storms were further classified into slightly convective, moderately convective and strongly convective by using ÃŸ parameter values. A 35 mm/hr threshold intensity is used for separating convective from non convective storms for local conditions. The areal distributions derived from radar and those from raingauge are poorly correlated. Each storm is unique in term of the movement of its storm centre. Some have long paths while others are circling within a limited area. The Aerial Reduction Factor (ARF) obtained from this study is comparable with ARF values obtained earlier by other researchers. A new Intensity Duration Frequency (IDF) curve is plotted based only on convective storms. For a given duration and return period, the new IDF generally results in higher storm intensity compared to the existing IDF curve. However, the new IDF curves are more appropriate for determining design storms for areas experiencing high occurrence of convective events. It is found that, a threshold value of 35 mm/hr could be used in developing IDF of Peak Over Threshold (POT) series. 2008-12 Thesis http://eprints.utm.my/id/eprint/9578/ http://eprints.utm.my/id/eprint/9578/1/NordilaAhmadMFKA2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TC Hydraulic engineering Ocean engineering TC Hydraulic engineering Ocean engineering
spellingShingle	TC Hydraulic engineering Ocean engineering TC Hydraulic engineering Ocean engineering Ahmad, Nordila Characterization of convective rain in Klang Valley, Malaysia
description	Storms of convective origin are generally known to be responsible for most of flash flood events in Malaysia. Flood problems are aggravated by rapid urbanization which modified the hydrological processes of a catchment. This study is aimed to evaluate the characteristic of convective rain in Klang Valley. The characteristics are based on short rainfall interval data between years 2000 and 2004. The convective events were analysed in terms of timing and spatial distribution. The spatial distributions of convective rainfall, derived from meteorological radar data and those observed on the ground are compared. Convective storm occurred most frequently during intermonsoon months which made up about 44%. A variety of storm shape is evident. Most of the convective events occurred over short durations. The convective storms were further classified into slightly convective, moderately convective and strongly convective by using ÃŸ parameter values. A 35 mm/hr threshold intensity is used for separating convective from non convective storms for local conditions. The areal distributions derived from radar and those from raingauge are poorly correlated. Each storm is unique in term of the movement of its storm centre. Some have long paths while others are circling within a limited area. The Aerial Reduction Factor (ARF) obtained from this study is comparable with ARF values obtained earlier by other researchers. A new Intensity Duration Frequency (IDF) curve is plotted based only on convective storms. For a given duration and return period, the new IDF generally results in higher storm intensity compared to the existing IDF curve. However, the new IDF curves are more appropriate for determining design storms for areas experiencing high occurrence of convective events. It is found that, a threshold value of 35 mm/hr could be used in developing IDF of Peak Over Threshold (POT) series.
format	Thesis
qualification_level	Master's degree
author	Ahmad, Nordila
author_facet	Ahmad, Nordila
author_sort	Ahmad, Nordila
title	Characterization of convective rain in Klang Valley, Malaysia
title_short	Characterization of convective rain in Klang Valley, Malaysia
title_full	Characterization of convective rain in Klang Valley, Malaysia
title_fullStr	Characterization of convective rain in Klang Valley, Malaysia
title_full_unstemmed	Characterization of convective rain in Klang Valley, Malaysia
title_sort	characterization of convective rain in klang valley, malaysia
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/9578/1/NordilaAhmadMFKA2008.pdf
_version_	1747814759511621632

Characterization of convective rain in Klang Valley, Malaysia

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