VEGETATION STRESS LEVEL AND NATURAL HYDROCARBON SEEPAGE IN UGWUEME, AWGU LOCAL GOVERNMENT AREA, ENUGU STATE, NIGERIA

  • Francis I. Okeke Department of Geoinformatics and Surveying Enugu Campus, University of Nigeria, Nsukka Mobile: +234-706-150-3617,
  • A. Enoh Mfoniso Department of Geoinformatics and Surveying Enugu Campus, University of Nigeria, Nsukka Mobile: +234-706-150-3617,

Abstract

Hydrocarbons that seep from the earth’s sub-surface often affect the environment, soil, rocks and stress growing vegetation. In this study, natural hydrocarbon seepage was mapped in Ugwueme, Awgu Local Government Area of Enugu State, Nigeria using Remote Sensing and GIS
techniques with the aim of detecting vegetation stress changes over a period of time. It was conducted using Landsat 7 ETM+ 1996, Landsat 7 ETM+ 2006 and Landsat 8 OLI/TIRS 2016.
The global positioning system and the topographical maps of scale 1:100,000 were utilized for ground verification. Results revealed that the category of severely stressed vegetation rose
progressively from 40.25% in 1996 to 54.73% in 2006 and then to 60.82% in 2016, while the category of less stressed vegetation reduced from 59.75% in 1996 to 45.27% in 2006 and then to
39.18% in 2016. There is an overall increase in the vegetation class cover classified as severely stressed, proving that remote sensing and GIS is a valuable tool for mapping hydrocarbon
seepage areas. Thus, afforestation, re-afforestation and good land practices are recommended as preventive and remedial measures in the study area.

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Published
2016-12-30
Section
Articles