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Ercan A.,University of California at Davis | Bin Mohamad M.F.,National Hydraulic Research Institute of Malaysia | Kavvas M.L.,University of California at Davis
Hydrological Processes | Year: 2013

The sea level change along the Peninsular Malaysia and Sabah-Sarawak coastlines for the 21st century is investigated along the coastal areas of Peninsular Malaysia and Sabah-Sarawak because of the expected climate change during the 21st century. The spatial variation of the sea level change is estimated by assimilating the global mean sea level projections from the Atmosphere-Ocean coupled Global Climate Model/General Circulation Model (AOGCM) simulations to the satellite altimeter observations along the subject coastlines. Using the assimilated AOGCM projections, the sea level around the Peninsular Malaysia coastline is projected to rise with a mean in the range of 0.066 to 0.141m in 2040 and 0.253m to 0.517m in 2100. Using the assimilated AOGCM projections, the sea level around Sabah-Sarawak coastlines is projected to rise with a mean in the range of 0.115m to 0.291m in 2040 and 0.432m to 1.064m in 2100. The highest sea level rise occurs at the northeast and northwest regions in Peninsular Malaysia and at north and east sectors of Sabah in Sabah-Sarawak coastline. © 2012 John Wiley & Sons, Ltd..


PubMed | National Hydraulic Research Institute of Malaysia, K water Institute, University of California at Davis and State of California
Type: | Journal: The Science of the total environment | Year: 2016

Impacts of climate change on the hydrologic processes under future climate change conditions were assessed over Muda and Dungun watersheds of Peninsular Malaysia by means of a coupled regional climate and physically-based hydrology model utilizing an ensemble of future climate change projections. An ensemble of 15 different future climate realizations from coarse resolution global climate models (GCMs) projections for the 21st century was dynamically downscaled to 6km resolution over Peninsular Malaysia by a regional climate model, which was then coupled with the watershed hydrology model WEHY through the atmospheric boundary layer over Muda and Dungun watersheds. Hydrologic simulations were carried out at hourly increments and at hillslope-scale in order to assess the impacts of climate change on the water balances and flooding conditions in the 21st century. The coupled regional climate and hydrology model was simulated for a duration of 90years for each of the 15 realizations. It is demonstrated that the increase in mean monthly flows due to the impact of expected climate change during 2040-2100 is statistically significant from April to May and from July to October at Muda watershed. Also, the increase in mean monthly flows is shown to be significant in November during 2030-2070 and from November to December during 2070-2100 at Dungun watershed. In other words, the impact of the expected climate change will be significant during the northeast and southwest monsoon seasons at Muda watershed and during the northeast monsoon season at Dungun watershed. Furthermore, the flood frequency analyses for both watersheds indicated an overall increasing trend in the second half of the 21st century.


Shamsuddin M.K.N.,National Hydraulic Research Institute of Malaysia | Shamsuddin M.K.N.,University Putra Malaysia | Sulaiman W.N.A.,University Putra Malaysia | Suratman S.,National Hydraulic Research Institute of Malaysia | And 2 more authors.
Arabian Journal of Geosciences | Year: 2014

The bank infiltration (BI) technique may be a viable option if the local climate, hydrological, and geological conditions are conducive. This study was specifically conducted to explore the possibility of using BI to source the polluted surface water in conjunction with groundwater. Three major factors were considered for evaluation: (1) investigation on the contribution of surface water through BI, (2) input of local groundwater, and (3) water quality characteristics of water supply. Initially, the geophysical method was employed to define the subsurface geology and hydrogeology, and isotope techniques were performed to identify the source of ground-water recharge and interaction between surface water and groundwater. The physicochemical and microbiological parameters of the local surface water bodies and groundwater were analyzed before and during water abstraction. Extracted water revealed a 5%–98% decrease in turbidity, as well as HCO3+, SO4-, NO3-, Al, As, and Ca concentration reduction compared with those of Langat river water. However, water samples from test wells during pumping show high concentrations of Fe2+ and Mn2+. In addition, amounts of Escherichia coli, total coliform, and Giardia were significantly reduced (99.9%). Pumping test results indicate that the two wells (DW1 and DW2) were able to sustain yields. © Saudi Society for Geosciences 2013.


Shamsuddin M.K.N.,National Hydraulic Research Institute of Malaysia | Shamsuddin M.K.N.,University Putra Malaysia | Sulaiman W.N.A.,University Putra Malaysia | Suratman S.,National Hydraulic Research Institute of Malaysia | And 2 more authors.
Hydrogeology Journal | Year: 2014

Bank infiltration (BI) is one of the solutions to providing raw water for public supply in tropical countries. This study in Malaysia explores the use of BI to supplement a polluted surface-water resource with groundwater. Three major factors were investigated: (1) contribution of surface water through BI to the resulting abstraction, (2) input of local groundwater, and (3) water-quality characteristics of the resulting water supply. A geophysical method was employed to define the subsurface geology and hydrogeology, and isotope techniques were performed to identify the source of groundwater recharge and the interaction between surface water and groundwater. The physicochemical and microbiological parameters of the local surface-water bodies and groundwater were analyzed before and during water abstraction. Extracted water revealed a 5-98 % decrease in turbidity, as well as reductions in HCO3 -, Cl-, SO4 2-, NO3 -, Ca2+, Al3+ and As concentrations compared with those of Langat River water. In addition, amounts of E. coli, total coliform and Giardia were significantly reduced (99.9 %). However, water samples from test wells during pumping showed high concentrations of Fe2+ and Mn2+. Pumping test results indicate that the two wells used in the study were able to sustain yields. © 2014 Springer-Verlag Berlin Heidelberg.


Lee H.L.,National University of Malaysia | Lee H.L.,National Hydraulic Research Institute of Malaysia | Tangang F.,National University of Malaysia | Hamid M.R.,National Hydraulic Research Institute of Malaysia | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2016

Salinity intrusion is a major concern when the freshwater extraction station is located in the estuary. This paper attempt to predict the salt intrusion length in the upper stretch of estuary, by applying different magnitudes of freshwater discharge at the river regime. The integrated two dimensional hydrodynamics model associated with advection dispersion model was performed to investigate the salinity intrusion. The model was well calibrated and verified by the measured data undertaken during dry season. The maximum salt intrusion length to the threshold of salinity density is 1.00 ppt on the existing condition was predicted at 9.97 km from the river mouth. Moreover, with the magnitude of 100.00 m3s-1 and 30.00 m3s-1 freshwater discharges at the upstream boundary (Kpg Tanggol), it was predicted the maximum salt intrusion length was 11.84 km and 21.41 km, respectively, from the river mouth. Therefore, it was determined the minimum freshwater discharge of approximately 100.00 m3s-1 is required at the Kpg Tanggol river gauging station, in order to maintain the acceptable salinity levels at the Pulau Musang freshwater pump house. However, the actual water discharge at the Kpg Tanggol boundary station should be higher, since the minimum discharge does not take into consideration the amount of water extraction by the Pulau Musang and SATU pump stations. Further analysis is required to execute the consequences of water extraction toward the salinity intrusion in the Terengganu estuary that coupled with projected sea level rise. © Published under licence by IOP Publishing Ltd.


Abdullah M.F.,National Hydraulic Research Institute of Malaysia | Ahmad K.,National University of Malaysia
Proceedings - 5th International Conference on Electrical Engineering and Informatics: Bridging the Knowledge between Academic, Industry, and Community, ICEEI 2015 | Year: 2015

Business Intelligence plays an important role in the organization for collecting, integrating, analyzing and transforming data to be useful for effective decision making process. Nowadays, organizations are flooded with various kinds of unstructured data such as e-mail, images, reports, maps, charts, publications. An effective and efficient business model of these data could help in decision making. Currently, there is no study done on the business intelligence model for managing unstructured data that can fulfil the organization needs. Therefore, the purpose of this paper is to improve the organization's business intelligence process through the exploitation of unstructured data that is owned by the organization. In this study, unstructured data are classified, enriched and complemented with diversity of data through the process of creating metadata for each unstructured data. Four main processes are proposed to transform unstructured data to structured data which are extraction, classification, storage and mapping of data classes. Each process and its activities are combined to produce an effective and efficient business intelligence model for unstructured data management. This model helps in generating new data and information that is more comprehensive and collective to help business intelligence through advanced analysis, decision-making process and planning new research areas. Output from this study is to make unstructured data as renewable assets that is easily accessible and used as a reference and foundation in business intelligence and decision making process. © 2015 IEEE.


Azhary W.A.H.W.,National Hydraulic Research Institute of Malaysia | Awang N.A.,National Hydraulic Research Institute of Malaysia | Hamid M.R.A.,National Hydraulic Research Institute of Malaysia
IOP Conference Series: Materials Science and Engineering | Year: 2016

KerachutBeach is a beautiful beach in Penang National Park (PNP). However this beach is categorisedas one of dangerous beach for swimming activities in Malaysia due to the drowning incidents reported almost every year. The steep beach slope and rip current were among the factors that lead to this incident. Using bathymetry profile, current, tidal and sediment data collected at site incorporated with UKMO wave data analysis,the hydrodynamic pattern was simulated using Mike 21 modelling software. Result from the model showed the evidence of rip current existence along the coastline. It showed that this rip current eventsoccurred during spring tide phase when the flow change from Flood to Ebb. During this period, the current tend to move parallel to the shoreline with maximum speed of 0.3m/s which is capable to swipe away a swimmer. The bathymetry profile at Kerachutis very steep and dangerous to swimmers since there is a 4 meter sudden plunge just meters away from the shoreline. © Published under licence by IOP Publishing Ltd.


Shamsuddin M.K.N.,National Hydraulic Research Institute of Malaysia | Suratman S.,National Hydraulic Research Institute of Malaysia | Ramli M.F.,National Hydraulic Research Institute of Malaysia | Sulaiman W.N.A.,National Hydraulic Research Institute of Malaysia | Sefie A.,University Putra Malaysia
IOP Conference Series: Materials Science and Engineering | Year: 2016

Groundwater and surface water quantity and quality are an important factor that contribute for drinking water demand and agriculture use. The water quality analysis was assessed using multivariate statistical analyses based on analytical quantitative data that include Discriminant Analysis (DA) and Principal Component Analysis (PCA), based on 36 water quality parameters from the rivers, lakes, and groundwater sites at Jenderam Hilir, which were collected from 2013 to 2014 (56 observations). The DA identified six significant parameters (pH, NO2-, NO3-, F, Fe2+, and Mn2+) from 36 variables to distinguish between the river, lake, and groundwater groups (classification accuracy = 98%). The PCA had confirmed 10 possible causes of variation in the groundwater quality with an eigenvalue greater than 1, which explained 82.931% of the total variance in the water quality data set. © Published under licence by IOP Publishing Ltd.


Sharip Z.,University of Western Australia | Sharip Z.,National Hydraulic Research Institute of Malaysia | Hipsey M.R.,University of Western Australia | Schooler S.S.,University of Wisconsin-Superior | Hobbs R.J.,University of Western Australia
International Journal of Design and Nature and Ecodynamics | Year: 2012

This paper examines the spatial patterns of water exchange based on water temperature variation between littoral and pelagic zones and compares the patterns in a series of shallow lakes at different water levels. Exchange patterns were assessed by developing isotherms along the transects and estimating the surface energy budget using the vertical temperature profi le and time-series measurements. Our results indicate the presence of density-driven fl ow induced by the differential temperature gradient between littoral areas, which are dominated by either fl oating-leaved or submerged vegetation, and the open pelagic region. Persistent stratifi cation was noted in the narrower lakes, which was thought to be due to the presence of dense submerged vegetation that attenuate wind-driven turbulence. In addition, variation of thermal stratifi cation and mixing dynamics between these lakes at different water levels has corresponding effects on the biological and chemical regimes. The circulation contributes to increased transport of the phosphate that could favour submerged species and subsequently induce shifts of macrophyte community composition. The results of this study have implications for the rehabilitation and management of lake ecosystems. © 2012 WIT Press.


Sharip Z.,University of Western Australia | Sharip Z.,National Hydraulic Research Institute of Malaysia | Schooler S.S.,University of Wisconsin-Superior | Hipsey M.R.,University of Western Australia | Hobbs R.J.,University of Western Australia
Biological Invasions | Year: 2012

In this study we: (1) present a quantitative spatial analysis of the macrophyte communities in Lake Chini with a focus on the biogeographical distributions of the native Nelumbo nucifera and the invasive Cabomba furcata; (2) examine the environmental changes that affect plant community composition; and (3) outline a conceptual model of the variation of ecological processes that shape the macrophyte communities. Plant species cover, biomass of C. furcata and N. nucifera, and water quality and environmental variables were measured before and after monsoonal floods in September 2009 and April 2010. Permutational multivariate analysis was used to examine the significance of the invasion of C. furcata at different spatial scales. Relationships between plant species cover and environmental variables before and after flooding were examined using principal coordinates analysis and non-parametric multivariate multiple regressions. Our findings suggest that (1) Variation in plant communities was significant at the lake scale and the distribution of plant species changed after annual floods. (2) Invasion by C. furcata significantly affected the overall plant community composition. (3) C. furcata biomass increased after the monsoonal season, which indicates that C. furcata is adapted to flooding events and that it is becoming increasingly abundant. (4) In addition to the strong monsoonal effect, total depth, nutrient concentration, and sediment type were important environmental variables that significantly affected plant community composition. The macrophyte community in Lake Chini is highly dynamic. The spatial and temporal plant community dynamics are associated with flood regime, water quality, and substrate. Human-induced changes in these parameters are likely shifting the macrophyte dominance from floating-leaved to submerged species. © 2011 Springer Science+Business Media B.V.

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