Dorofki M.,National University of Malaysia |
Elshafie A.H.,National University of Malaysia |
Jaafar O.,National University of Malaysia |
Karim O.A.,National University of Malaysia |
Abdullah S.M.S.,Development and Environmental Studies
Water Resources Management | Year: 2014
Most infiltration models survey infiltration in large scale regions using an assumption that the slope of the ground is equal to zero. The Modified Green and Ampt model is one of a few infiltration models that considers slope as an input parameter in its formulation. Here, using artificial neural networks in a raster-based design, basic research is presented regarding the effect of surface slope on infiltration. For the investigation, three catchments with different areas and slopes were selected as case studies, based on existing runoff stations in the upstream region of the Johor River Basin in southern Malaysia. In this research, the efficiency of six different functions was studied in order to determine the best performer for slope in the Modified Green and Ampt model. We also sought to find the most suitable ANN transfer function for infiltration calculations. By calculating runoff for each pixel, accumulation maps were used for corroborating the suitability of the obtained results. The results indicated that the Log-sigmoid was the most appropriate transfer function. We also determined that using the exponential form for the slope in the Modified Green and Ampt model formulation was more accurate, as compared to the original linear shape. © 2013 Springer Science+Business Media Dordrecht.
Sakawi Z.,Earth Observation Center |
Rozaimi Ariffin M.,Development and Environmental Studies |
Mastura S.A.,National University of Malaysia |
Jali M.F.M.,Development and Environmental Studies
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013
Heavy metal is a source of environmental pollutant affecting the aquatic and terrestrial ecosystems. The sources of heavy metal pollution are the industries, domestic sewage and landfills. Landfill operation is a sourceof heavy metal pollution which not only affected the biospehere, hydrospehere and athmosphere, but also the litosphere systems around it. This study aims to analyse the heavy metals concentration around the landifill vicinity for indication of heavy metal pollution. This study analysed the soil content of the heavy metal based on the distance and depth around the vicinity of the landfill. Field sampling of the soil and laboratory analysis were used. The field study involved 20 stations and 60 samples according to the wind directions: North, East, South and West.The analysis was conducted through the use of Inductively Coupled Plasma Mass Spectroscopy (ICP-MS). Seven types of heavy metals were identified as indicators for pollution namely Mg, Ca, Mn, Fe, Cu, Zn and Pb. The results indicated that the concentration of Fe was the most dominant per specific distances and depths and exceeded the DOE minimum standard (301 mg/L) in North, East and West directions. While Cu was the second most dominant, with concentraion exceeding minimum DOE standard (19.8 mg/L) per specific distance and depth, mainly in the West direction. . © Maxwell Scientific Organization, 2013.
Ariffin M.R.,Development and Environmental Studies |
Sakawi Z.,National University of Malaysia |
Ismail L.,Development and Environmental Studies
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014
This study examined the impact of WTP operation on health, psychology and physiology of the sensitive receivers at Taman Semarak, Bandar Baru Nilai, Negeri Sembilan. Building WTP around residential areas is a necessity for treating domestic waste water. Poor management of WTP and inefficient waste treatment adversely impact the physical and human environment. One major impact of WTP operation is odour pollution. The sensitive receivers were residents living about 200 m from the WTP at the Taman Semarak. Data was obtained through a survey of the 100 sensitive receivers. The findings indicated that there were influences of odour from the operation of WTP on the sensitive receivers in the vicinity. Almost 2/3 of the sensitive receivers confirmed the health, psychological, physiological impact due to the WTP operation. © Maxwell Scientific Organization, 2014.