National Hydraulic Research Institute of Malaysia NAHRIM

Malaysia

National Hydraulic Research Institute of Malaysia NAHRIM

Malaysia
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Faghih M.,National Hydraulic Research Institute of Malaysia NAHRIM | Mirzaei M.,National Hydraulic Research Institute of Malaysia NAHRIM | Adamowski J.,McGill University | Lee J.,San Jose State University | El-Shafie A.,University of Malaya
River Research and Applications | Year: 2017

Disaster prevention planning is affected in a significant way by a lack of in-depth understanding of the numerous uncertainties involved with flood delineation and related estimations. Currently, flood inundation extent is represented as a deterministic map without in-depth consideration of the inherent uncertainties associated with variables such as precipitation, streamflow, topographic representation, modelling parameters and techniques, and geospatial operations. The motivation of this study is to estimate uncertainties in flood inundation mapping based on a non-parametric bootstrapping method. The uncertainty is addressed through the application of non-parametric bootstrap sampling to the hydrodynamic modelling software, HEC-RAS, integrated with Geographic Information System (GIS). This approach was used to simulate different water levels and flow rates corresponding to different return periods from the available database. The study area was the Langat River Basin in Malaysia. The results revealed that the inundated land and infrastructure are subject to a flooding hazard of high-frequency events and that the flood damage potential is increasing significantly for residential areas and valuable land-use classes with higher return periods. The proposed methodology, as well as the study outcomes, of this paper could be beneficial to policymakers, water resources managers, insurance companies and other flood-related stakeholders. Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.


Normi Idris A.,National Hydraulic Research Institute of Malaysia NAHRIM | Zaharin Aris A.,Environmental Forensics Research Center | Sheikhy Narany T.,Environmental Forensics Research Center | Praveena Mangala S.,Technical University of Madrid | And 4 more authors.
MATEC Web of Conferences | Year: 2017

Numerical models are capable of simulating various groundwater scenarios and relate it towards groundwater management. A mesh based density dependent flow model, FEFLOW is used to simulate groundwater flow and transport for a coastal island aquifer in Kg. Salang, Tioman Island, Malaysia. FEFLOW is designed to simulate 2D and 3D, variable density groundwater flow and multi-species transport. The impacts of pumping and recharge rates represented by three different groundwater scenarios, which were investigated by means of hydraulic heads, TDS concentrations and water balance components. Scenario A showed the standard saturated groundwater flow and the steady state fluid flow. Over pumping and inconsistency in recharge rate are the stresses shown in Scenarios B and C. Scenario B involved in the maximum pumping rate of 96m3 per day and recharge rate of 300mm per year has shown a drawdown of 1.5 m. Scenario C showed the extreme pumping rate of 1000m3 per day and without recharge has shown a decrease in groundwater levels of 6.3 m.and groundwater storage (50%). Scenario B presented the most promising finding compared with Scenario C. Highest hydraulic heads, lowest mass concentration and positive groundwater storage (2578.6m3/day) were obtained in Scenario B. Additionally, and further progress is needed in obtaining the water usage data from each part to determine the best pumping rate. A sustainable groundwater management plan is crucial to maintain the natural resources and social benefits as well as to protect the ecological balance. © The Authors, published by EDP Sciences, 2017.


Abdullah M.F.,Water Resources and Climate Change Research Center | Ibrahim M.,Water Resources and Climate Change Research Center | Zulkifli H.,National Hydraulic Research Institute of Malaysia NAHRIM
IoTBDS 2017 - Proceedings of the 2nd International Conference on Internet of Things, Big Data and Security | Year: 2017

Evolution and growth of data exclusively in Government sector should be an added advantage for the Government to increase the service delivery to the public. Big Data Analytics (BDA) is one of the most advanced technologies to analyse data owned by the Government to explore other fields, or new opportunities that can bring benefits to the Government. Although BDA concept has been implemented by many parties, there exists a number of misconceptions related to the concept from the aspect of understanding and implementation of the project. National Hydraulic Research Institute of Malaysia (NAHRIM) as one of the four agencies that have been implemented Malaysia's BDA Proof-of-Concept (POC) initiative is no exception to these misconceptions. In this paper, we will discuss the misunderstandings and challenges faced throughout our BDA project, in encouraging and increasing the awareness of the implementation of BDA in Government sector. Copyright © 2017 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.


Abdullah M.F.,Water Resources and Climate Change Research Center | Ibrahim M.,Water Resources and Climate Change Research Center | Zulkifli H.,National Hydraulic Research Institute of Malaysia NAHRIM
IoTBDS 2017 - Proceedings of the 2nd International Conference on Internet of Things, Big Data and Security | Year: 2017

Decision making in natural disaster management has its own challenge that needs to be tackled. In times of disaster, government as a response organisation must conduct timely and accurate decisions to ensure rapid assistance and effective recovery for the victim involved can be conducted. The aim of this paper is to embark strategic decision making in government concerning to disaster management through Big Data Analytics (BDA) approach. BDA technology is integrated as a solution to manage, utilise, maximise, and expose insight of climate change data for dealing water related natural disaster. NAHRIM as a government agency responsible in conducting research on water and its environment proposed a BDA framework for natural disaster management using NAHRIM historical and simulated projected hydroclimate datasets. The objective of developing this framework is to assist the government in making decisions concerning disaster management by fully utilised NAHRIM datasets. The BDA framework that consists of three stages; Data Acquisition, Data Computation, and Data Interpretation and seven layers; Data Source, Data Management, Analysis, Data Visualisation, Disaster Management, and Decision is hoped to give impact in prevention, mitigation, preparation, adaptation, response and recovery of water related natural disasters. Copyright © 2017 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.


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 | Year: 2016

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.


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 | Year: 2012

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.


Abdullah I.,National Hydraulic Research Institute of Malaysia NAHRIM | Shah A.M.,National Hydraulic Research Institute of Malaysia NAHRIM | Awang N.A.,National Hydraulic Research Institute of Malaysia NAHRIM | Hamid H.R.A.,National Hydraulic Research Institute of Malaysia NAHRIM | Lee L.H.,National Hydraulic Research Institute of Malaysia NAHRIM
Malaysian Forester | Year: 2016

The mangrove forest covers almost 70% of the coastal vegetation at Pulau Duyong, Sabah. The sheltered area of Terusan Duyong provided a conducive habitat for the mangroves to flourish and occupies almost the entire low lying areas in this island. The changes of coastal dynamics which is the increase in sea level can lead to changes on salinity, inundation area, current and wave patterns. Knowing the changes of these variables could affect mangrove distribution on this island. A study had been conducted to predict the potential adverse impacts to mangrove area at Pulau Duyong in the near future. It was estimated that the loss of mangrove area is about 133 ha, 508 ha, and 958 ha in the years 2020, 2040 and 2060, respectively, due to inundation.


Lee H.L.,National University of Malaysia | Lee H.L.,National Hydraulic Research Institute of Malaysia NAHRIM | Tangang F.,National University of Malaysia | Wahap M.H.,National Hydraulic Research Institute of Malaysia NAHRIM | Yang S.,National Hydraulic Research Institute of Malaysia NAHRIM
IOP Conference Series: Materials Science and Engineering | Year: 2016

Hypoxia is commonly defined as oxygen depletion when the dissolved oxygen (DO) levels fall below 2 mg L-1. In this paper, physical factors contributed to hypoxic condition in the diurnal tide, Terengganu Estuary has been experimentally and analytically studies. Hourly profiles on DO, current speed and nutrient were measured during the wet and dry seasons for continuous period approximately 30 hours, which cover both high and low tide at two fixed stations, located at the river mouth and 9.50 km upstream from the river mouth, respectively. It was observed that the entire estuary was free from hypoxia during the wet season. However, hypoxia was developed at the river mouth during the dry season with lowest reading of the DO level was 0.78 mg L-1. It was demonstrated that the combination of high contamination of nutrient, low current speed, the geometrical formation and water stratification are recognized as important role in formatting the hypoxia at the Terengganu river mouth. © Published under licence by IOP Publishing Ltd.


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 | Year: 2014

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.


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 | Year: 2012

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.

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