Survey of Some High-Risk Erosion Sites in Kogi State, North-Central Nigeria using Remote Sensing Techniques

Satellite images (Landsat 2001) for four local government areas of Kogi State, including Ankpa, Dekina, Okene, and Kabba-Bunu, were used for the survey of nine (9) high-risk erosion sites. This was done to determine the spread, development, and dynamic of gullies in the areas. Gully borderlines were delineated for the identified gully system in each of the local government areas. Gully parameters such as length, width, and depth were determined. The gully was classified into severe, moderate, and mild. The result shows Ankpa and Dekina with the longest gully length ranging from 300m in Ajobe to 700m in Ogane Aji-Dekina with 7m to 25m width and a depth of about 4m to 7m. Moderate gulling was apparent in Omigbo Kabba water channelization with a gully length of 500m, 15 meters width, and 4 meters depth, followed by Etahi and Agassa in Okene Local Government Area. Mild gullying with a total gully length of about 1.2 meters in Etahi and 1.4 meters in Agassa. The recorded width ranges from 20 to 25 meters with 17 meters depth in Etahi to 4 meters in Agassa.