Which types of erosion are taken into account by the Universal Soil Loss Equation?
Process-based (physically based) models mathematically describe the erosion processes of detachment, transport, and deposition and through the solutions of the equations describing those processes provide estimates of soil loss and sediment yields from specified land surface areas.
How do you estimate soil erosion from a field using Universal Soil Loss Equation?
The USLE model, commonly used to calculate average annual soil loss per unit land area resulting from sheet and rill erosion, can be written as A=R*E*L*S*C*P.
What is soil loss estimation?
The Universal Soil Loss Equation (USLE) equates soil loss per unit area with the erosive. power of rain, the amount arid velocity of runoff water, the erodibility of the soil, and. mitigating factors due to vegetation cover, cultivation methods and soil conservation. It.
What is the difference between erosivity and erodibility?
Conceptually, rainfall erosivity is the capacity of rain to produce erosion, whereas soil erodibility is the susceptibility of the soil to be eroded. Particles travel across the soil surface at virtual velocities that vary from the velocity of the flow to near zero.
What are the 4 types of soil 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.
Who gave Universal Soil Loss Equation?
The USLE was developed by W. H. Wischmeier, D. D. Smith, and others with the U.S. Department of Agriculture (USDA), Agricultural Research Service (ARS), Soil Conservation Service (SCS), and Purdue University in the late 1950s.
Why is the Universal Soil Loss Equation important?
The Universal Soil Loss Equation (USLE) is hailed as one of the most significant developments in soil and water conservation in the 20 thcentury. It is an empirical technology that has been applied around the world to estimate soil erosion by raindrop impact and surface runoff.
How is soil loss measured?
Soil erosion test plots should be equipped with runoff measurement and sampling systems. For flow measurement, H-flume, long throat flume, drop box, and V-notch weir are commonly used. Water level or/and velocity of these devices are measured by various types of water level gauges and flow meters.
What is rainfall erosivity factor?
The rainfall erosivity factor (R) is defined as the average annual sum of individual storm erosion. index values, E130, where E is the total storm kinetic energy per unit area, and I3o is the maximum 30. minute rainfall intensity.
How do you calculate erosion rate?
Calculating the Erosion Rate The erosion rate measures the amount of soil mass lost over a specified time period. If 30,000 kilograms of soil was lost over four years, then: Erosion rate equals 30,000 divided by 4, or 7,500 kilograms per year.
What is Erodibility of soil?
Soil erodibility (K ) is the intrinsic susceptibility of a soil to erosion by runoff and raindrop impact. All other factors being equal, the higher the K value, the greater the susceptibility of the soil to rill and sheet erosion by rainfall.
What is soil Erosivity?
Definition. Erosivity is a measure of the potential ability of soil, regolith, or other weathered material to be eroded by rain, wind, or surface runoff.