This study was therefore carried out to assess applicability of the rusle model in estimating erodibility factor k and develop an appropriate. Evaluating the rusle model and developing an empirical equation for estimating soil erodibility factor in a semiarid region a. The factor k is a measure of soil erodibility under this standard condition. The soil loss ratio slr is then an estimate of the ratio of soil loss under actual conditions to losses experienced under the reference conditions. Soil erodibility kfactor is an essential factor in soil erosion prediction and.
The soil erodibility factor k represents both susceptibility of soil to erosion and the amount and rate of runoff, as measured under the standard unit plot condition. The method was applied to a typical agricultural watershed in the state of idaho, which is subject to increasing soil erosion and flooding problems. Soil calculator estimate how much soil you need for lawn. Mapping soil erosion and sediment yield susceptibility. The estimation of soil erosion in taiwan and many countries of. But, due to the absence of erodibility index map, the soil erodibility factor was calculated by using equation 5 and textural triangle figure 11.
Soil erodibility studies had been conducted in one of the watershed of lombok in 2015. K factor is used in the rusle2 soil loss prediction equation. Soil loss values computed by previous versions of rusle1. C represents the effects of plants, soil cover, soil biomass, and soil disturbing activities on erosion.
You can select a county from the dropdown menu or from the map below. Soil erodibility factor k the soil erodibility factor k relate to the average longterm soil and soil profile response to the erosive power associated with rainfall and runoff. The designation for a sand or clay is given in the unified soil classification system, astm d 2487. Erodibility factor k from the universal soil loss equation usle in this study was the result of soil erodibility estimation or soil capability to be dispersed by rain. Soil erodibility k, which has important influences on the accuracy of soil loss prediction, is a critical factor in the universal soil loss equation usle and the models modified from it. The maximum percent of organic matter in calculation is limited to 4% auerswald, fiener, martin, and elhaus, 2014. The k factor is an empirical measure of soil erodibility as affected by intrinsic soil properties. K the factor for soil erodibility soil erodibility varies during the year. Base map a base map has been generated by digitizing the survey.
As direct determination of the k factor requires longterm measurements of soil loss, which is costly and timeconsuming, a few techniques have been developed to estimate the k factor values from readily available data on soil properties zhang et developing a nomograph for estimating. Other factors such as the stone content referred as stoniness, which acts as protection against soil erosion, are very significant in mediterranean countries. Soil erodibility in europe high resolution dataset 500m. Highly erodible land definitions nrcs caribbean area. Estimating the usle soil erodibility factor in sicily, south. Additional research, experiments and data have led to the development of the revised universal soil loss equation rusle, which is a computerized version of usle. Evaluating the rusle model and developing an empirical. Natural resources conservation service updated t and k factors. The proposed equation for estimating k factor can be expressed as. Soil erodibility soil erodibility k is the intrinsic susceptibility of a soil to erosion by runoff and raindrop impact. Files for surface soil erodibility factors data set reference code 199801 to accommodate users with a variety of gis software, the data giving the surface soil erodibility factors are available in several different formats. It is also considered to represent the rate of soil loss per unit of rainfall erosion index for a specific soil.
The files needed by each of the types of user below are described separately. Usda nomograph used to calculate soil erodibility k factor. Soil erodibility factor k soils vary in their susceptibility to erosion. To remedy this situation, indirect methods are applied to estimate this factor and.
Mushtak talib jabbarapplication of gis to estimate soil erosion using rusle 37 fig. Coarse textured soils, such as sandy soils, have low k values, about 0. Webbased revised universal soil loss equation rusle. Is there any software available to analyse the soil erosion due to rainfall erosion. Soil erodibility estimation using lucas point survey data of. Erosion prediction revised universal soil loss equation. Note that the unit in this example is tonhectareper year. Processbased soil erodibility estimation for empirical water. Torri d, poesen j, borselli l 1997 predictability and uncertainty of the soil erodibility factor using a global data set.
Improvement of the kfactor of usle and soil erosion. Trabalhador sancarlense, 400, sao carlos sp, 566590, brazil. Using the methodology, a discharger will be able to identify the appropriate, areallyweighted k factor value for a construction project. Inverse distance weighted interpolation with a power parameter of 2 performed best r 2 adjusted 0. Values of the soil erodibility factor estimated by nomograph and fuzkbas program were very low as compared to the observed values. Abstractfunctional relationships between soil erodibility equations of empiricallybased revised universal soil loss equation and processbased water erosion prediction project models were investigated using new datasets from rainfall simulation experiments to overcome conceptual differences of models in estimating soil erodibility. Rusle has the same formula as usle, with improvements in many of the factor estimates. The k factor is an index which quantifies the relative susceptibility of the soil to sheet and rill erosion. Determining and mapping soil erodibility factor case study. Thus, rusle i has become a standard model for estimating soil loss 1. Soil erodibility is one of six factors in the revised universal soil loss equation rusle that reflects the ease with which the soil is detached by splash during rainfall andor by surface flow. Many authors have used soil erodibility k factor in usle as indicator of soil erosion barthes et al. Soil erodibility and its estimation for agricultural soils in.
Soil erodibility k factor is the most important tool for estimation the erosion. The soil erodibility factor k is a measure of erodibility for a standard condition. Erosion prediction revised universal soil loss equation rusle the revised universal soil loss equation rusle is an easily and widely used computer program that estimates rates of soil erosion caused by rainfall and associated overland flow. Estimation of soil erosion risk using the universal soil loss. The soil erodibility factor k is the rate of soil loss per rainfall erosion index unit as measured on a standard soil. Estimating the usle soil erodibility factor in sicily. How can i calculate rusle kfactor erodibility factor without soil structure. Comparisons of leading construction earthwork, excavating and site work estimation and bid management software. Erosion measurements based on unit plot conditions are used to experimentally determine values for k. You could use the kuery software and dataset, which determines k values in is. Natural resources conservation service updated t and k.
The rusle is the simple multiplication of 5 soil erosion risk factors, of which one is the soil erodibility also called kfactor. Soil erodibility k factor high resolution dataset for europe. The dsms provide the necessary soil property information for estimating the erodibility k factor including soil texture, bulk density and organic carbon. How can i calculate rusle kfactor erodibility factor without soil structure information. Estimating water erosion and sediment yield with gis, rusle. Evaluation and estimation of soil erodibility by different techniques. The soil erodibility factor k is the rate of soil loss per rainfall erosion index unit as measured on a standard soil plot and often determined using inherent soil properties 40. Evaluation and estimation of soil erodibility by different. Rusle k values california state water resources control board. This change can affect soil loss values by about 25% in certain locations including the midwestern and northeastern regions of the us. Assessment of methods for predicting soil erodibility in soil loss modeling jamil alexandre ayach anache1, claudia goncalves vianna bacchi2, eloi panachuki3, teodorico alves sobrinho2 1 school of engineering of sao carlos eesc, university of sao paulo usp, av. How can i calculate rusle kfactor erodibility factor without soil. Estimation of soil loss using rusle model for sebou watershed.
Factor conservation practise factor rainfall data a r x k x l x s x c x p soil erosion map fig. Prediction the soil erodibility and sediments load using soil. Sandy soils required that more than half of the material be larger than the no. The soil erodibility factor was devised by the natural resources conservation service nrcs for use in estimating soil losses with the universal soil loss equation usle. Mar 08, 2006 files for surface soil erodibility factors data set reference code 19980111 to accommodate users with a variety of gis software, the data giving the surface soil erodibility factors are available in several different formats. The accuracy of estimating erosion risk depends on prediction model and its factor. Application of gis to estimate soil erosion using rusle. Developing a nomograph for estimating erodibility factor. The major obstacles to any accurate, largescale soil erodibility estimation are the lack of. Soil erosion modeling using rusle and gis on dudhawa catchment.
Mapping soil erosion and sediment yield susceptibility using. How can i calculate rusle kfactor erodibility factor. Is there any software available to analyse the soil erosion due to. C factor map soil erodibility factor cropping mang.
Prediction the soil erodibility and sediments load using soil attributes. The most common method of soil erodibility calculation is the soil erodibility nomograph. Location map of study area material and methods researchers have developed many predictive models. Soil erodibility estimates for the lucas point dataset.
Soil erosion modeling using rusle and gis on dudhawa catchment 1149 figure 1. The nomograph considers additional factors and the variability of onsite factors i. Erodibility tends to be high early in the springduring and immediately following thawing and during periods when the soil is wet. Among universal soil erosion equation usle factors r, k, l, s and p, soil erodibility factor k is one of the most important and key factors which determines soil particles resistance to be detachment by water erosion rainfall andor runoff forces. Information system gis techniques, and a sediment delivery concept for estimating water erosion and sediment delivery at the watershed scale was presented. Wischmeier wh, johnson cb, cross bv 1971 a soil erodibility nomograph for farmland and construction sites. The aim of this software is calculate the frequency distributions of the soil erodibility values k observed for given textural, organic matter and climate data. As an effective tool to estimate soil loss, usle has been widely applied in the us and around the world.
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