How does rill erosion differ from gully erosion?
Rill erosion is caused by slow movement of water along small channels on bare land with less vegetative cover. Gully erosion creates a deep channels that the surface runoff is further enhanced. The water movement is faster, creating a deeper channels.
What is rill erosion simple definition?
Rill erosion is a type of erosion that results in small, yet well defined streams. The rills or small channels (often only 30cm deep) are caused when water running across the surface of the ground gathers in a natural depression in the soil, and erosion is concentrated as the water flows through the depression.
How is gully erosion prevented?
Preventing gully erosion maintaining remnant vegetation along drainage lines and eliminating grazing from these areas. increasing water usage by planting deep-rooted perennial pastures, trees, or an appropriate mixture of both thus maintaining healthy, vigorous levels of vegetation.
What is rill water erosion?
RILL EROSION: A series of small channels on a slope carved by running water. Rill erosion in a field.
Is a rill larger than a gully?
Ephemeral Cropland Gullies: In general, an ephemeral cropland gully is larger than a rill and smaller than a gully. It usually results from the junction of rills that form a dendritic (branching or tree-like) pattern of channels.
How can rill erosion evolve into gully erosion?
Once the slope tapers off and flattens at the base, soil particles sit there, deposited into a terrace or are carried further into principal waterways. Once the channels formed by rill erosion reach four inches, they become gullies. The width, depth, and flow strength of gullies are much more significant.
What is an example of rill erosion?
Rill erosion can be caused by rainfall or the movement of melting snow. These shallow flow paths through which rainwater flows are an example of rill erosion.
What do you mean by rill?
a brook or stream; rivulet. a small channel or gulley, such as one formed during soil erosion. Also: rille one of many winding cracks on the moon.
How is gully erosion treated?
In general, three strategies are needed to repair gully erosion:
- modifying the catchment to reduce or redirect runoff.
- stabilising gully heads, floors and walls with built structures, earthworks, vegetation or fencing.
How can gullies be eliminated?
Finger gullies can be eliminated by terracing. In bigger gullies, the erosive velocity of water may be reduced by constructing a series of check dams. This can be done by gully plugging, terracing or by planting cover vegetation.
How is rill erosion formed?
Once it accumulates on the surface of soil sitting on a slope, water runoff can’t help but flow downhill. In a way, rill erosion is the consequence of poor water infiltration into the soil. Factors that trigger rill erosion include: Poorly structured soils — are prone to break up during through the impact of rainfall.
What is smaller than a gully?
A ravine is defined as a small, narrow, and deep depression, smaller than a valley, and larger than a gully (Bates and Jackson, 1984).
What are the four main types of erosion?
Rainfall, and the surface runoff which may result from rainfall, produces four main types of soil erosion: splash erosion, sheet erosion, rill erosion, and gully erosion.
What are the four main causes of erosion?
The four forces of erosion are water, wind, glaciers, and gravity. Water is responsible for most erosion. Water can move most sizes of sediments, depending on the strength of the force. Wind moves sand-sized and smaller pieces of rock through the air.
What are the 5 types of soil erosion?
The five agents of erosion are wind, waves, running water, glaciers and gravity. As we discussed earlier, gravity is the underlying agent of all types of mass movement. Without the force of gravity to pull sediment down an incline, a landslide would not occur.
What are the types of soil erosion?
Rainfall and surface runoff. Rainfall, and the surface runoff which may result from rainfall, produces four main types of soil erosion: splash erosion, sheet erosion, rill erosion, and gully erosion.