Asian Journal of Earth Sciences
[SJR: 0.151] [H-I: 5] [17 followers] Follow
Open Access journal
ISSN (Print) 1819-1886 - ISSN (Online) 2152-3509
Published by Science Alert [64 journals]
- Geoelectrical Characterization of Matured Petroleum
Soil in Port Harcourt, Nigeria
Abstract: Electrical Resistivity Tomography (ERT) and vertical electrical resistivity sounding (VES) surveys were jointly carried out to characterize a petroleum hydrocarbon impacted site. Both surveys were carried out after 14 months of spill and repeated after 28 months of the first survey (42 months of spill) using same traverse and electrode positions. The objective is to characterize the electrical structure and determine the lateral and depth extensions of the hydrocarbon contaminated horizons in soil and groundwater. Results revealed that the soil and groundwater in the investigated site have been contaminated by petroleum hydrocarbon, with a characteristic low resistivity anomaly associated with microbial degradation over time. The minimal depth of impact is approximately 13 m below the groundwater table, with a lateral spread in excess of 100 m on either side of the spill point parallel to the pipeline right of way. The contaminant strength is higher for season one than two, since it is a recent spill. Results also show that soil degradation arising from petroleum hydrocarbon contamination may result to changes in bulk density of the impacted soils. This may likely affect the compressibility and surface hydrogeology of the soils and therefore, alter the infiltration rate and direction of groundwater flow. This way, groundwater recharge from surface precipitation in the investigated site could be adversely affected.
PubDate: 21 April, 2016
- Impact of El-Niño on Agro-economics in Malaysia and the Surrounding
Regions: An Analysis of the Events from 1997-98
Abstract: This study explores the influence of El-Niño related climate change that impacts the development of agriculture sector in Malaysia. In order to identify the impacts, this study analyzes the information of El-Niño events from 1997-1998. This would offer of having a standpoint to formulate the future strategy with an understanding of the nature of El-Niño and its vulnerability which has been hit by the Pacific Rim region and the Southern oscillation, including in Malaysia. Since, the currently available researches are inadequate to observe the events of El-Niño, formulation of strategic planning is mainly based on assumption and hypothetical projection locally. Under such climate, this study proposes the Action plan for furthering the strength by chalking-out the prevailing weakness of adapting capacity of El-Niño and its adverse impact on agriculture. The proposed action plan ultimately offers the socio-economic wellbeing in Malaysia by significantly reducing the vulnerability of El-Niño and enhancing the performance.
PubDate: 21 April, 2016