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Shaaban A.J.,National Hydraulic Research Institute of Malaysia NAHRIM | Amin M.Z.M.,National Water Research Institute | Ohara N.,University of California at Davis
Journal of Hydrologic Engineering

The future projections of climate change by means of global climate models of the Earth provide fundamental coarse-grid-resolution hydroclimate data for studies of the effect of climate change on water resources. This paper reports on a study that was performed during 2001-2006, in which the climate change simulations of the coupled global climate model of the Canadian Center for Climate Modeling and Analysis were downscaled by a regional hydroclimate model of Peninsular Malaysia (RegHCM-PM) to the scale of the subregions and watersheds of Peninsular Malaysia (PM), to assess the effect of future climate change on its water resources. On the basis of the simulations of hydroclimatic conditions during the historical period of 1984-1993 and future periods of 2025-2034 and 2041-2050, this report concludes that the overall mean monthly streamflow is approximately the same during both the future period, and the historical period for most of the watersheds of Peninsular Malaysia, except Kelantan and Pahang. In those two watersheds, a significant increase occurs in the overall mean monthly streamflow during the future period. In the future, high flow conditions will be magnified in the Kelantan, Terengganu, Pahang, and Perak River watersheds during the wet months, whereas low monthly flows will be significantly lower in the Selangor and Klang watersheds during the dry months. © 2011 American Society of Civil Engineers. Source

Abdul Wahab A.S.,University Putra Malaysia | Syed Ismail S.N.,University Putra Malaysia | Praveena S.M.,University Putra Malaysia | Awang S.,National Hydraulic Research Institute of Malaysia NAHRIM
Iranian Journal of Public Health

Conclusion: The overall results demonstrated that water mimosa could be used to remediate wastewater polluted with Cd, Cu and Pb. The plant is not recommended for human consumption as its ability to retain heavy metals in edible parts.Methods: Water mimosa was treated with Pb, Cu and Cd at concentrations of 0.5 to 20 mg/L and the level of heavy metals uptake was measured. Treated plants were also harvested and soaked in boiled water (100˚C) for 2 to 10 minutes to determine the level of heavy metals reduction. Heavy metals were detected by Inductively-Coupled Plasma- Optical Emission Spectrometry (ICP-OES). Experiment was conducted in the Environmental Health laboratory, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia from June to December 2013.Results: Water mimosa accumulates up to 93% of Cd (5 mg/L) after 10 days of treatment, the highest as compared to Cu (80%) and Pb (50%). It also has the highest BCF when treated with 10 mg/L of Cd. The heavy metals concentration in plant tissue decreased as the boiling time increased.Background: Neptunia oleracea or ‘water mimosa’ has a phytoremediation ability which is rarely being assessed. This plant also can be eaten as raw or cooked and but brought such concern on its safety for human consumption. The objective of this study was to assess the phytoremediation ability of water mimosa and its safety for human consumption. © 2014, Iranian Journal of Public Health. All rights reserved. Source

Amin M.Z.M.,National Hydraulic Research Institute of Malaysia NAHRIM | Shaaban A.J.,National Water Research Institute | Ohara N.,University of Wyoming | Kavvas M.L.,University of California at Davis | And 4 more authors.
Journal of Hydrologic Engineering

Climate change's impact on the Sabah and Sarawak water resources in the Northern sector of the Borneo Island, Malaysia, was assessed based on the dynamically-downscaled general circulation model projections (GCMPs) by means of a regional hydroclimate model (RegHCM). Four future projections under the special report on emissions scenarios (SRES) A1B emission scenario from two general circulation models (GCMs) were selected for this study. The RegHCM, which is a coupled nonhydrostatic atmospheric and upscaled land surface process model, is capable of downscaling the outputs of these GCMPs (GCM projections) to the watershed scale at a 9-km grid resolution at hourly time intervals for hundreds of years-a simulation for 420 years was performed in this study. This dynamic downscaling by the RegHCM can incorporate the detailed soil and land-cover data. It is shown in this article that utilizing a methodology that incorporates a GCM, a RegHCM, and a hydrological routing model allows assessing climate change on the hydrologic conditions at the watershed scale. It is revealed that the effect of climate change in the states of Sabah and Sarawak can be quite heterogeneous. Furthermore, it is shown that the effect of a projected land-cover change over a geographical region, such as Sabah and Sarawak, can be evaluated in the future using the RegHCM described in this study. Results indicate that the increase in oil palm plantations in Sabah and Sarawak may not significantly affect the local water resources. In order to improve the assessment accuracy of land-use change, further investigation on the model parameters associated with future land-cover information is desirable. © 2015 American Society of Civil Engineers. Source

Kasim M.F.,Darul Iman University, Malaysia | Kasim M.F.,National Hydraulic Research Institute of Malaysia NAHRIM | Juahir H.,Darul Iman University, Malaysia | Tawnie I.,National Hydraulic Research Institute of Malaysia NAHRIM | And 6 more authors.
Jurnal Teknologi

In this research, determination of water quality status was carried out by using non-parametric Mann-Kendall analysis for the Linggi River Basin and for classification of the river, HACA and PCA has been used to classify the river to obtain the clearest picture of the water quality status. The dataset includes 6 parameters for 6 monitoring stations (1997 to 2012). Mann-Kendall trend analysis shows trend analysis indicate that significant improvement trend for all parameters studied except for BOD (WQ1 (P<0.1) and WQ6 (P<0.05)) and SS (WQ4 to WQ6 (P<0.05)) trend were shows the unhealthy significant trend. This indicates that even though the WQI getting good in trend, a few parameters such as BOD and SS need to be watched and enforcement by the local authority need to be done to make sure the WQI continuously getting better in the future. HACA grouped the six monitoring stations into three different clusters based on their similarities namely less pollution site (LPS), medium pollution site (MPS) and high pollution site (HPS). HACA indicate one station (WQ1) into group LPS, two stations into MPS (WQ2 and WQ3) and three stations into HPS (WQ4, WQ5 and WQ6) respectively. PCA was used to investigate the origin of each water quality variable based on the clustered region. Three principal components (PCs) were obtained with 75.3% total variation for HPS, 73.4% for MPS and 68.1% for LPS. The major pollution source for HPS are of anthropogenic source (municipal waste, domestic wastes) while for MPS the major source of pollution was from non point source pollution such as animal husbandry in livestock farm. For the LPS, major source comes from the sea tide effect (natural effect). The identification and classification of different region by this study will help the local authorities make better and more informed decisions about the improvement water quality program for the future. © 2015 Penerbit UTM Press. All rights reserved. Source

Liew Y.S.,National Hydraulic Research Institute of Malaysia NAHRIM | Selamat Z.,National Hydraulic Research Institute of Malaysia NAHRIM | Ghani A.A.,Universiti Sains Malaysia | Zakaria N.A.,Universiti Sains Malaysia
Urban Water Journal

The Urban Stormwater Management Manual for Malaysia (MSMA) was published in 2001 by the Department of Irrigation and Drainage (DID), which promotes Best Management Practices (BMPs) aimed at stormwater management at the source. The construction of detention ponds has been strongly encouraged for water quantity control for new housing developments. This study focuses on the evaluation, using the InfoWorks Collection Systems (CS) model, of the effectiveness of a constructed dry detention pond built in 1996 located at Kota Damansara, Selangor. Hydrological and hydraulic data were collected for model calibration and verification. The study indicates that the dry detention pond can achieve its design goals, catering the flow from a 100-year Average Recurrence Interval or ARI storm and complies with the design requirement in the MSMA for major urban stormwater systems. © 2012 Copyright Taylor and Francis Group, LLC. Source

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