Risk Mapping of Gully Erosion Prone Areas in Asaba Metropolis
Keywords:
Gully Erosion, DGPS, GIS, Remote Sensing, Risk Assessment, Urban Planning, Environmental ManagementAbstract
Gully erosion poses significant threats to urban infrastructure and environmental sustainability in Asaba Metropolis, Nigeria. This study employed an integrated approach, combining Differential Global Positioning System (DGPS), Geographic Information System (GIS), and Remote Sensing (RS) technologies, to assess erosion risks and their impacts on the surrounding environment. Field data collection using DGPS and satellite imagery from Google Earth Pro enabled the creation of detailed maps and buffer analysis to identify high-risk zones. The study revealed that Asaba's lateritic soil, heavy rainfall, and undulating terrain contribute to its susceptibility to erosion. Results show that 30%, 40%, and 30% of the study area fall within high-, moderate-, and low-risk zones, respectively. The integration of GIS and RS technologies facilitated the development of effective erosion risk maps, informing urban planning and environmental management efforts. This study underscores the importance of adopting a comprehensive approach to mitigate gully erosion risks and ensure sustainable environmental management in vulnerable regions.
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