Which state is highly affected by Gully erosion in Nigeria?
Which state is highly affected by Gully erosion in Nigeria?
… The Anambra and Enugu basins are the areas most affected by gully erosion (Onyekwere, 2001), an example of this can be seen in Fig. 1. Most of the gullies develop on areas with valley topography rather than areas with flat land (Obiadi et al., 2011) .
What is the main cause of Gully erosion?
The cause of gully erosion Gully erosion occurs when water is channelled across unprotected land and washes away the soil along the drainage lines. Under natural conditions, runoff is moderated by vegetation, which generally holds the soil together, protecting it from excessive runoff and direct rainfall.
What are the examples of Gully erosion?
Gully erosion happens when runoff concentrates and flows strongly enough to detach and move soil particles. For example, a waterfall may form, with runoff picking up energy as it plunges over the gully head. Splashback at the base of the gully head erodes the subsoil and the gully eats its way up the slope.
What type of erosion is common in the southern part of Nigeria?
Conclusion. Soil erosion in the form of gullies is very common in southeastern Nigeria. This review has shown the influence of geology, climate, geomorphology (slope), vegetation, man and soil itself on gully development and soil erosion in general.
What are the stages of gully erosion?
A gully develops in three distinct stages; waterfall erosion; channel erosion along the gully bed; and landslide erosion on gully banks.
How did landslide occur in Nigeria?
The result revealed that the latest landslide was caused by the release of intensely fractured rocks along adjacent blocks of a fault plane, and prevalent tectonic stress condition set the stage for the landslide, while slope instability in conjunction with prolonged high-intensity rainfall triggered the movement.
Where does gully erosion occur?
Gully erosion (Fig. 6) occurs where concentrated surface water scour out the regolith and underlying rock with the debris being either deposited downslope or transported into river systems creating major downstream problems. The gully form and severity is very dependent on the rock type.
Where does gully erosion happen?
A gully is a landform created by running water, mass movement, or commonly a combination of both eroding sharply into soil or other relatively erodible material, typically on a hillside or in river floodplains or terraces.
How many types of gully erosion are there?
Where is gully erosion commonly found?
Gully erosion is commonly found in Chambal valley in Uttar Pradesh and also in of Maharastra. Gully erosion is the removal of soil along with the drainage lines by surface water runoff. Gullies continue to move by headward erosion or by slumping of the side walls unless steps are taken to stabilize the disturbance.
Where did landslide occur in Nigeria and when?
A swarm of 14 landslides occurred spontaneously within the Azenge Mountain on November 13 th , 2010 between the hours of 1 and 6 am after torrential rains. The landslides were studied using interviews, field observations and laboratory study of the soil samples collected from the major landslide site.
