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 …
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 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 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 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.
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.Is 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 erosion by water?Water erosion is the detachment and removal of soil material by water. The process may be natural or accelerated by human activity. … Water erosion wears away the earth’s surface. Sheet erosion is the more-or-less uniform removal of soil from the surface.
Article first time published onHow 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.
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.
What is the meaning of Erodibility?
Erodibility. The susceptibility of the ground surface to erosion. In an aeolian context, this refers to susceptibility to wind erosion. For bare, dry, surfaces, this is determined by the particle size of surface sediments.
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.
What event is caused by gravity?
Gravity moves earth materials from higher elevations to lower elevations. Landslides, avalanches, and mudflows are examples of dangerous erosion by gravity. Slump and creep move material slowly downslope.
What is the difference between weathering and erosion?
What is the difference between weathering and erosion? Weathering is the process of decomposing, breaking up, or changing the color of rocks. … So, if a rock is changed or broken but stays where it is, it is called weathering. If the pieces of weathered rock are moved away, it is called erosion.
What is the counter plugging?
Explanation: a device usually on a cord used to make an electrical connection by putting it into another part (as a socket) 2 : a piece (as of wood or metal) used to stop up or fill a hole.
What is strip plantation?
A strip plantation is a short rotation plantation 205. established on both sides of various roads and railway lines (Muhammed, Koike, Haque, & Miah, 2007). Strip plantation participants are involved in the program through a. benefit-sharing mechanism.
What is contouring in farming?
Contour farming is the practice of tillage, planting, and other farming operations performed on or near the contour of the field slope. … Tillage and planting operations follow the contour line to promote positive row drainage and reduce ponding.
What is bench terrace?
Bench terraces are a soil and water conservation measure used on sloping land with relatively deep soils to retain water and control erosion. They are normally constructed by cutting and filling to produce a series of level steps or benches. This allows water to infiltrate slowly into the soil.
What is Rill and Interrill erosion?
Interrill erosion is a process of soil detachment by the impact of raindrops, transport by shallow sheet flow, and delivery to rill channels. Rill erosion is the erosion of sediment by concentrated flow. Rills carry flow from interrill areas as well as the rain that directly falls on them.
