From Wikipedia, the free encyclopedia
What do you mean by USLE?
The Universal Soil Loss Equation (USLE) predicts the long-term average annual rate of erosion on a field slope based on rainfall pattern, soil type, topography, crop system and management practices.
Where is USLE model used?
USLE-type modelling has also been used in all kind of extreme ecosystem types and for various management scenarios, e.g. from volcanic soils in Chile with Mediterranean climate (Stolpe, 2005) to the possible mitigation impact of organic farming on soil erosion rates from mountainous monsoonal watersheds in South Korea …
What is the formula for USLE?
The USLE is an empirically based equation, derived from a large mass of field data, especially erosion plots and rainfall simulator experiments, and computes sheet and rill erosion as follows: A=RKLSCP where A is computed soil loss, R is the rainfall-runoff erosivity factor, K is a soil erodibility factor, L is the …What modified USLE?
ABSTRACT The Modified Universal Soil Loss Equation (MUSLE) was related to average annual sediment yield on 14 small rangeland drainage basins by substituting average annual runoff and a calibrated design discharge for the runoff and peak flow terms respectively in MUSLE.
How many dimensionless factors are in Usle?
The six major input parameters used in the study are vegetation cover factor (C), slope length factor (L), slope steepness factor (S), soil erodibility factor (K), rainfall erosivity factor (R), and erosion control factor (P).
What is conservation practice factor?
PetroWiki. The ratio of soil loss for contouring, strip cropping, or terracing, to that for up and down the slope farming, as used in the soil-loss equation.
What is water erosion called?
The erosion that’s caused by the water runoff from these heavy rainstorms or melting snow is called gully erosion. This type of water erosion creates large cuts in the land that are usually more than one foot deep. The final type of water erosion is called streambank erosion.What is gravity erosion?
□ Gravity Erosion is better known as Mass Movement and is defined as the transfer. of rock and soil down‐slope by direct action of gravity without a flowing medium. Page 2. (such as water or ice).
What is the difference between Usle and Rusle?The Revised Universal Soil Loss Equation (RUSLE) is an upgrade of USLE that is land use independent. … The major changes compared to USLE are in the values given for erosion as modified by vegetative cover and better calculations of the slope (LS) factors, as well as more advanced computerization.
Article first time published onIs strip cropping?
Strip cropping is a method of farming which involves cultivating a field partitioned into long, narrow strips which are alternated in a crop rotation system. It is used when a slope is too steep or when there is no alternative method of preventing soil erosion. … The forages serve primarily as cover crops.
What is soil Erosivity?
Erosivity is the term used to describe the potential of raindrop impact, runoff from snowmelt, or water applied with an irrigation system rainstorm to detach and erode soil.
How do you calculate RUSLE?
RUSLE maintains the same empirically based equation as USLE to compute sheet and rill erosion as follows: A=RKLSCP where A is computed soil loss, R is the rainfall-runoff erosivity factor, K is a soil erodibility factor, L is the slope length factor, S is the slope steepness factor, C is a cover management factor, and …
What is the reason for sheet erosion?
Cause and dynamics of sheet erosion. Sheet erosion is caused by the force of raindrops impacting on bare soil (Ellison 1944) and dislodging particles of earth. This force is dependent on the speed of fall (a function of the length of fall and the wind-speed) and the weight (a function of the diameter of drops).
Why is rain kinetic energy?
Basically, the rain kinetic energy results from the kinetic energy of each individual raindrop that strikes the soil.
What is rainfall factor?
What is rainfall erosivity (R-Factor)? Rainfall erosivity is the kinetic energy of raindrop’s impact and the rate of associated runoff. The R-factor is a multi-annual average index that measures rainfall’s kinetic energy and intensity to describe the effect of rainfall on sheet and rill erosion.
What is soil erodibility factor?
The soil erodibility factor (K-factor) is a quantitative description of the inherent erodibility of a particular soil; it is a measure of the susceptibility of soil particles to detachment and transport by rainfall and runoff. … The soil erodibility factor ranges in value from 0.02 to 0.69 (Goldman et al.
Which soil is more resistant erosion?
Soil structure and composition Sediments containing more clay tend to be more resistant to erosion than those with sand or silt, because the clay helps bind soil particles together.
Which of the following is a biological soil conservation measure?
(i) Contour farming: It is practiced in the hilly regions or on the slopes. … The circular rows of plants across the slopes check the soil erosion. Thus, contour farming reduces run off, saves more water for crops, reduces soil erosion and increases the yield of crops (Fig. 25.4).
Who developed Rusle?
Both RUSLE1. 06c and RUSLE2 were developed and are maintained principally by the USDA-Agricultural Research Service (ARS), the USDA-Natural Resources Conservation Service (NRCS), and the University of Tennessee. RUSLE began development at the National Soil Erosion Research Laboratory in the early 1990’s.
Why is estimating soil loss important?
Soil erosion caused due to natural phenomena is termed geological erosion, and that triggered due to overexploitation of land surface is called accelerated erosion. Evaluation of loss of soil from watersheds is required while assessing the severity of soil erosion and its effects on agricultural production.
Which soil is not suitable for bund construction?
From the experience, it has been found that bunds could stand well in shallow, medium and medium deep soils. In deep black soil, due to cracks in dry condition, the bunds fail.
Is a mudslide erosion?
A mudslide, of course! Mudslides occur when a large amount of water causes the rapid erosion of soil on a steep slope. … A mudslide can vary from very watery mud to thick mud with tons of debris, including large boulders, trees, and even cars or houses.
How does gravity shape the earth?
Gravity is the force that attracts a body toward the center of Earth or toward any other physical body having mass. Gravity, along with Earth’s rotation, causes the poles of Earth to be squeezed while the area along the equator bulges. This lends to Earth being an oblate spheroid.
How does gravity work?
The answer is gravity: an invisible force that pulls objects toward each other. … So, the closer objects are to each other, the stronger their gravitational pull is. Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body.
What is erosion for kids?
Erosion is the wearing away of the land by forces such as water, wind, and ice. Erosion has helped to form many interesting features of the Earth’s surface including mountain peaks, valleys, and coastlines.
What are 3 types of erosion?
- surface erosion.
- fluvial erosion.
- mass-movement erosion.
- streambank erosion.
What is glacier erosion?
Glaciers erode the underlying rock by abrasion and plucking. Glacial meltwater seeps into cracks of the underlying rock, the water freezes and pushes pieces of rock outward. The rock is then plucked out and carried away by the flowing ice of the moving glacier (Figure below).
How is USLE different from modified USLE?
The universal soil loss equation (USLE), the revised version of it (RUSLE), and its modified version (MUSLE) are used in hydrology for computing the amount of potential soil erosion and sediment yield. … However, its accuracy increases if it is coupled with a hydrological rainfall-excess model (Novotny and Olem, 1994).
What is gully classification?
Gullies can be classified based on three factors viz. their size, shape (cross section) and formation of branches or continuation.
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.
