Hydrology
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Item Open Access data banjir kilat KL 2008-2015(2025-01-14) Wan Hanna Melini Wan MohtarThis is a data extracted from Laporan Banjir JPS, focusing on flash flood occurrence within the Kuala Lumpur region.Item Open Access Rainfall in Sarawak(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Mohd. Azmi Ambak; Mohd. Nasir SaadonThe main objective of this study is to help understand, on a monthly basis, both the rainfall intensity and the distribution of rainy days in the state of Sarawak.Item Embargo Data Sedimen Tasik Kejuruteraan UKM(Fakulti Kejuruteraan dan Alam Bina (FKAB))Data diambil kira berdasarkan BR, AR, VAR dan TSSItem Embargo Data Eksperimen - Spillway(Fakulti Kejuruteraan dan Alam Bina (FKAB))Data berkaitan alur tumpahan yang diukur berdasarkan flow condition, water pressure, water level, velocity, scouring potential dan flood potential based on water depth.Item Open Access Monthly and annual rainfall variability in Penisular Malaysia(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Nhakhorn SomchitThis paper re-addresses the study of the rainfall variability in Peninsular Malaysia. An earlier investigation has been conducted forty years ago. Due to the fact that: (1) a larger and more sophisticated number of meteorological stations is nowadays in place, and (2) the effect that global warming has on precipitation, we feel that a new study of rainfall variability is both timely and pertinent. This is, therefore, the aim of this particular study. Our results show that larger variability does not (always) occur whenever lowest rainfall is recorded.Item Open Access Monthly distribution of preciptation and evaporation difference in Sabah and Sarawak(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Mohd. Nasir SaadonIn spite of the fact that the annual pattern of precipitation and evaporation difference, P - E, is completely different in East Malaysia compared to Peninsular Malaysia. It is shown that this difference is also positive in both Sabah and Sarawak.Item Restricted Choosing the best fit probability distribution in rainfall design analysis for Pulau Pinang, Malaysia(Springer, 2023) Rofat Bunmi Mudashiru; Ismail Abustan; Nuridah Sabtu; Hanizan B. Mukhtar; Waheed BalogunDesign rainfall is frequently utilized in the planning and design of urban infrastructure, including culverts and urban drainage systems. The choice of an appropriate probability distribution that sufficiently fits the observed rainfall data is one of the key elements in designing rainfall estimation. The current study compared five probability distribution methods which include Gumbel, log-Normal, Normal, Pearson III, and log-Pearson III probability distribution method (PDMs) to analyze the rainfall pattern of the study area.Item Embargo Data Banjir KL 2003-2015(Fakulti Kejuruteraan dan Alam Bina (FKAB), 2003)Data banjir yang diambil daripada beberapa kawasan di Kuala Lumpur bermula dari tahun 2003 hingga 2015. Ukuran diambil berdasarkan tempoh (duration), keamatan (intensity) dan kedalaman banjir (flood depth).Item Open Access Projected near-term changes in monsoon precipitation over Peninsular Malaysia in the HighResMIP multi-model ensembles(Springer, 2022) Ju Liang; Mou Leong Tan; Jennifer L. Catto; Matthew K. Hawcroft; Kevin I. Hodges; James M. HaywoodChanges in the monsoon season rainfall over Peninsular Malaysia by the mid-21st century are examined using multi-model ensemble data from the CMIP6 HighResMIP experiments. We examine simulations of the present and future climate simulations run under a high emission scenario of greenhouse gases from the Shared Socioeconomic Pathways (SSP5-8.5). The combined effects of horizontal and vertical resolutions on the projected changes in monsoon rainfall and associated environmental fields are investigated by comparing the ensemble mean of the projected changes utilizing appropriate multi-model groupings.Item Open Access Comparison of rainwater quality before and during the MCO using chemometric analyses(Springer, 2023) Nadiana Arifn; Hafzan Juahir; Roslan Umar; Mokhairi Makhtar; Nur Hanis Mohamad Hanapi; Azimah Ismail; Munirah Abdul ZaliThis study aimed to classify the spatiotemporal analysis of rainwater quality before and during the Movement Control Order (MCO) implementation due to the COVID-19 pandemic. Chemometric analysis was carried out on rainwater samples collected from 24-gauge stations throughout Malaysia to determine the samples' chemical content, pH, and conductivity.Item Open Access Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution(Springer, 2021) Ju Liang; Mou Leong Tan; Matthew Hawcroft; Jennifer L. Catto; Kevin I. Hodges; James M. HaywoodThis study investigates the ability of 20 model simulations which contributed to the CMIP6 HighResMIP to simulate precipitation in different monsoon seasons and extreme precipitation events over Peninsular Malaysia. The model experiments utilize common forcing but are run with different horizontal and vertical resolutions. The impact of resolution on the model's abilities to simulate precipitation and associated environmental fields is assessed by comparing multi-model ensembles at different resolutions with three observed precipitation datasets and four climate reanalyses.Item Open Access Estimation of rainwater harvesting by the reflectance of the purity index of rainfall(Springer, 2021) Siti Nor Fazillah Abdullah; Azimah Ismail; Hafizan Juahir; Fathurrahman Lananan; Nor Muzlinda Hashim; Nadiana Ariffin; Tengku Azman Tengku MohdRainwater harvesting is an effective alternative practice, particularly within urban regions, during periods of water scarcity and dry weather. Thecollected waterr is mostly utilized for non-potable household purposes and irrigation. However, due to the increase in atmospheric pollutants, the quality of rainwater has gradually decreased. This atmospheric pollution can damage the climate, natural resources, biodiversity, and human health. In this study, the characteristics and physicochemical properties of rainfall were assessed using a qualitative approach. The three-year (2017-2019) data on rainfall in Peninsular Malaysia were analysed via multivariate techniques.Item Restricted Spatio-temporal dynamics of rainfall erosivity due to climate change in Cameron Highlands, Malaysia(Springer, 2020) Nuraddeen Mukhtar Nasidi; Aimrun Wayayok; Ahmad Fikri Abdullah; Muhamad Sauf Mohd KassimRainfall erosivity is one of the main factors of soil erosion that is expected to change as climate variables alter and impact soil conservation policies significantly. It is important to understand the potential trends in rainfall erosivity and its impacts on the environment, especially in tropical areas where severe rainfall is expected to continue to rise. This study aimed to project spatial and temporal rainfall erosivity factor using ensemble Global Circulation Models (GCMs)Item Restricted Physical- emipirical models for prediction of seasonal rainfall extremes of Peninsular Malaysia(Elsevier, 2020) Sahar Hadi Pour; Ahmad Khairi Abd Wahab; Shamsuddin ShahidReliable prediction of rainfall extremes is vital for disaster management, particularly in the context of increasing rainfall extremes due to global climate change. Physical-empirical models have been developed in this study using three widely used Machine Learning (ML) methods namely, Support Vector Machines (SVM), Random Forests (RF), Bayesian Artificial Neural Networks (BANN) for the prediction of rainfall and rainfall related extremes during Northeast Monsoon (NEM) in Peninsular Malaysia from synoptic predictors.Item Restricted Spatial and temporal characteristics of monthly rainfall over Limbang River Basin, Northern Borneo: an evaluation through multivariate statistics(Springer, 2020) M. V. Ninu Krishnan; M. V. Prasanna; H. VijithIdentification of homogeneous rainfall regime in Limbang River Basin (LRB), Malaysia, Northern Borneo and its temporal characteristics were elucidated in the present study. Multivariate statistical techniques were used to characterize 15 years (2000-2015) monthly rainfall data from twelve rain gauging stations present in LRB. Analysis of monthly accumulated rainfall indicates that LRB receives maximum rainfalls during January, April, November, December and least in July.Item Open Access Monthly and annual distribution of both the frequency of rainy days and rainfall intensity in Peninsular Malaysia(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Nhakhorn SomchitThe aim of this study is to analyze both the monthly and the annual distributions of both the frequency of rainy days and the rainfall intensity in Peninsular Malaysia.Item Restricted Spatial and temporal characteristics of rainfall over a forested river basin in NW Borneo(Springer, 2019) H. Vijith; D. Dodge-WanThe spatial and temporal patterns of rainfall over the Baram River Basin (BR) in Sarawak (Malaysian Borneo) were characterised through cluster analysis and multivariate statistics for the 25 year period from 1990 to 2014. Baram River Basin recorded an average annual rainfall of 3654 mm with high spatial and temporal variations.Item Open Access Estimation of short-duration rainfall intensity from daily rainfall values in Klang Valley, Malaysia(Springer, 2018) Abdullah Al Mamun; Md. Noor bin Salleh; Hanapi Mohamad NoorData on intensity-duration-frequency or design rainfall are one of the most important information required for various hydrological and water resources studies. However, such crucial data are often unavailable in various parts of the world due to lack of enough rain gauging stations. It is not only tedious to determine design rainfall from the raw data but also occasionally impossible to calculate due to lack or absence of short-duration rainfall data. Generally, the manual rain gauges outnumber the automatic gauges, making it difficult to have adequate data on short-duration rainfall values, which is very important for urban hydrology. However, no graphical or mathematical relation could be found in the literature, which can be used for quick estimation of short-duration design rainfall from the daily rainfall data recorded by the manual stations. Annual maximum rainfall data from 143 rain gauging stations located at Klang Valley in Malaysia were used in this study.Item Restricted Chemical characteristics of rainwater in the tropical rainforest region in northwestern Borneo(Springer, 2020) Ninu Krishnan Modon Valappil; Prasanna Mohan Viswanathan; Vijith HamzaA comprehensive study of the chemical composition of rainwater was carried out from October 2016 to September 2017 in the equatorial tropical rainforest region of northwestern Borneo. Monthly cumulative rainwater samples were collected from different locations in the Limbang River Basin (LRB) and were later categorized into seasonal samples representing northeast monsoon (NEM), southwest monsoon (SWM), and inter-monsoon (IM) periods.Item Restricted Statistical analysis of trends in monthly precipitation at the Limbang River Basin, Sarawak (NW Borneo), Malaysia(Springer, 2018) M. V. Ninu Krishnan; M. V. Prasanna; H. VijithEffect of climate change in a region can be characterised by the analysis of rainfall trends. In the present research, monthly rainfall trends at Limbang River Basin (LRB) in Sarawak, Malaysia for a period of 45 years (1970-2015) were characterised through the non-parametric Mann-Kendall and Spearman's Rho tests and relative seasonality index.