Dear friends i am working to estimate soil loss, and for that i am using the rusle model. Hickey alockheed martin environmental services, las vegas, nv. The slope length and slope steepness factors are interrelated. Pow sin 2 where pow which means power is a function in the arcgis spatial analyst. Webbased gis application for soil erosion prediction da ouyang and jon bartholic.
Estimation of soil erosion using rusle and gis techniques. Cover management factor c the cover management factor represents the ratio of soil loss under a given cover to that of the base soil. Meanannual erosion potential for colorado and new mexico. Calculation of slope length factor ls factor in arcgis where ar is upslope contributing area per unit contour width, b deg is the slope, m and n are parameters, and a0 22. The sfactor measures the effect of slope steepness, and the lfactor defines the impact of slope length. The revised universal soil loss equation rusle is given. I found about ls tool after i researched on other ways to calculate slope length but cant find any place to access ls tool. Soil erosion mapping and severity analysis based on rusle. Determination of soil erosion vulnerability in the lafa. The ls factor should be calculated by using the specific catchment area sca in contrast to the total catchment area tca. Institute of water research, michigan state university.
Therefore a geographic information system arcgis 10. The lscalculation was performed using the original equation proposed by desmet and govers 1996 and implemented using the system for automated geoscientific analyses saga, which incorporates a multiple flow algorithm and contributes to a precise estimation of flow accumulation. In this video, i have clearly shown the steps required calculate ls factor using moore and burch equation in arcmap. The r factor which is the mean annual sum of individual storm erosion index values ei30 depends on the value of the total kinetic energy of the storm and the i30 value, the maximum. The arcgis software has become a prominent tool for the usle equation 1 modeling. Assessment of soil erosion using rusle, gis and remote sensing in nw ethiopia. In this study, the importance of the use of revised universal soil loss equation rusle is well recognized, in which the r factor plays the most important role. The factor ls in the ouljat sultan watershed varies. Department of agriculture usda agricultural research service ars site for both rusle1. The calculation of meanannual erosion by rusle takes the form of. In order to facilitate the usage of the ls factor tool, it provides the area to length conversion options. The uslels and ruslels maps were estimated following the procedures of wischmeier and smith 1978 and renard et al.
A gisbased tool for estimating soil loss in agricultural river basins. The rusle model predicts longterm average annual soil loss expressed in tons per acre per year a, and is determined by the product of five factors. L is the slope length factor, representing the effect of slope length on erosion. Estimation of soil erosion risk of the euphrates river. Rusle, sateec gis system, rfactor, lsfactor, soil erosion, arcgis. The cartosati dem was used for computing the flow accumulation and the slope length ls. Topographic factor ls local topographic factor is the most susceptible parameter of rusle in the soil loss estimation renard et al. The unit contributing areabased estimation method uca converts slope length to unit contributing area for considering twodimensional topography, however is not able to predict the. The data used for this study includes, a topographic map of the. Ls represent the proportion of soil loss per unit area on. Ls factor was finally calculated using the equation 2. The orders of presentation are the ls factors first, followed by the r factor, k factor, c factor, and the p factor.
Soil erosion assessment using gis and revised universal soil loss. Estimating the ls factor for rusle through iterative slope. The ls factor from rusle was developed through rusle. How to calculate ls factor for uslerusle in arcmap youtube. Arcgis software purchased by the faculty of sciences of meknes using the equation of mitasova et al. In the current study, the revised universal equation of soil losses rusle is implemented, to assess the risk of water erosion in the sebou watershed morocco. Equation revised universal soil loss equation uslerusle, water erosion prediction project wepp. Rusle ls factor geographic information systems stack. A computer algorithm to calculate the usle and rusle lsfactors over a twodimensional landscape is presented. The ls400,000 map was made by icona 1989 using the usle but without using gis. A computer algorithm to calculate the usle and rusle ls factors over a twodimensional landscape is presented. However, there appear to be important differences in absolute values. A description of creating each usle factor in arcgis 10 is given. Lsfactor slope length and steepness factor for the eu.
Webbased gis application for soil erosion prediction. Gis model for potential soil erosion with the optimization of rusle. The revised universal soil loss equation rusle, which is a computerized version of usle with improvements in many of the factor estimates, was initially released for public use in 1992. The methods used to combine and analyze the usle with the arcgis software are described. A r k ls c p where a is the meanannual erosion potential in units of tons per acre per year, r is the rainfallenergy factor in units of tons per hectare per year, k is the soilerodibility factor, ls is the slopelength factor, c is the vegetative cover factor, and p. Methodology for estimating the topographic factor ls of. In its original version, the universal soil loss equation usle is as follows.
How to calculate ls factor using moore and burch equation. Test of the rusle and key influencing factors using gis. Slope length and steepness factor lsfactor description. Rs gis application in soil erosion modeling and ws. Extension of a gis procedure for calculating the rusle equation ls factor. Ls factor for rusle geonet, the esri community gis and. Pdf gisbased determination of rusles ls factor for river. These prerequired maps are namely the r factor, k factor, ls factor, cfactor, p factor map of the area. I explain a new procedur to produce ls factor map using arcgis. When compared to a manual method, both methods yield broadly similar results in terms of relative erosion risk mapping. Alternative approaches for determining the uslem slope length factor for grid cells. Ls factor is used in usle rusle equations for soil erosion modeling. Notes without flag m set, the entire analysis is run in memory maintained by the operating system. A gis procedure for automatically calculating the usle ls factor on.
The low ls values are found in the gentle slope areas which show the significance of the slope on ls estimation. I would be really thankful if someone could help me find a way to either access ls tool or any other efficient and precise way to calculate slope length. Assessing soil erosion risk using rusle through a gis open source. Uslebased assessment of soil erosion by water in the. The soil use and occupation factor c and the conservation practices factor p. Use of satellite data, gis and rusle for estimation of. Evaluate potential soil loss under varying slope configurations, vegetation cover, and management practices reclamation plan, phc evaluation. Pdf on nov 1, 2017, akali ngaywa moses and others published gisbased determination of rusles ls factor for river nzoia basin in. Among the six input layers, the combined slope length and slope angle lsfactor has the greatest influence on soil loss at the european scale.
The universal soil loss equation usle model is the most frequently used model for soil erosion risk estimation. A dimensionless sediment transport capacity index that. Estimating the ls factor for rusle through iterative slope length processing of digital elevation data within arcinfo grid a limitation of using the usle and rusle soil erosion models at regional landscape scales has been the difficulty in obtaining an lsfactor grid suitable for use in gis applications. Using usped method, the ls factor is calculated in the gis program according to the.
A gis procedure for automatically calculating the usle ls. Digital mapping of rusle slope length and steepness factor. Comparison of different approaches to ls factor calculations. The aim of this study was estimated the average annual soil erosion by using rusle model and the arcgis software of the euphrates river watershed, this model was based on five factors for. How to calculate ls factor using moore and burch equation in arcmap. Pdf modeling soil erosion using rusle and gis tools. It is the ratio of soil loss from the field slope length to that from a 72. The calculation of erosion requires a huge amount of information and data from various sources available in different formats and scales. Using the raster calculator in arcgis, a cfactor map as in. To calculate the ls factor, 10meter digital elevation model data was obtained from usgs. Uslerusle contain parameters for slope length factor l and slope. In this video, i show the calculation of ls factor l slope lenght,s slope. These factors, when specialized, may be entered into a gis database, so that the.
Esther en 38200692008 department geomatic engineering and geospatial information systems a research project report submitted to. Extension of a gis procedure for calculating the rusle. Assessment of soil erosion using rusle, gis and remote. Soil erosion was most sensitive to the topographic factor ls, followed by the practice. When using the usle or rusle, the component factors relating to rainfall erosivity r, slope length and steepness factor ls, soil erodibility k, groundcover c and soil conservation practices p are multiplied to calculate the average annual soil loss per unit area e. The geographic information systembased gisbased methods which have been developed for estimating the ls factor for usle and rusle also have limitations. The steeper and longer the slope, the higher the risk for erosion. The ls factor describes the combined effects of slope length l and slope gradient s, which strongly controls the transport of soil particles. This approach has been used successfully in various studies to assess soil loss and its planning management 8,38,39,40,41,42,43,44. The use of revised universal soil loss equation rusle as a potential technique in mapping. These erosion prediction technologies, which are referred to as erosion models, are widely used to estimate rates of soil erosion caused by rainfall and associated overland flow.
A new european slope length and steepness factor ls. Discussion created by muengineer on may 23, 2012 latest reply on may 24. Abstract soil erosion is a worldwide environmental problem that degrades soil productivity and water quality, causes sedimentation and increases the. A computer algorithm to calculate the usle and rusle lsfactors over a. Soil science society of america, soil science society of america journal, 69, pp. How to calculate ls factor using moore and burch equation in arcmap duration. The ls factor represents a ratio of soil loss under given conditions to that at a site with the standard slope steepness of 9% and slope length of 22. Calculation of slope length factor ls factor in arcgis. Identification of erosion prone areas and prioritization. Revised universal soil loss equation rusle, using gis and rs. Lsfactor the universal soil loss equation usle model is the most frequently used model for soil erosion risk estimation. The present study demonstrated the utility of high resolution liss iv satellite data for accurate mapping of landuse landcover which forms an important component while computing the land cover and management factor and erosion control practice factor for soil loss estimation using rusle model.
The use of revised universal soil loss equation rusle as. The potential soil erosion and the actual soil erosion maps have been derived by multiplication of the thematic maps in raster calculation in arcgis using the r, k, ls factor maps and the r, k, ls, c, p factor maps respectively. The geographic information system based gis based methods which have been developed for estimating the ls factor for usle and rusle also have limitations. The combined lengthslope ls factor in the universal soil loss equation is a measure of the sediment transport capacity of overland flow. The spatial interpolation techniques available in the arcgis software were used along with rainfall data of faraway rain. Recently, the revised universal soil loss equation rusle has been. Extension of a gis procedure for calculating the rusle equation ls. Although both methods yield similar slope values, the use of the manual method leads to an. I am trying to perform a rusle analysis and cannot figure out how to calculate the ls factor. Ls factor is used in uslerusle equations for soil erosion. Estimating the ls factor for rusle through iterative slope length processing of digital elevation data. Usle and geographical information system gis for soil erosion. Estimation of soil loss using rusle model for sebou.
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