Erosion Potential Method (Gavrilović method) sensitivity analysis

Abstract

Dragičević N., Karleuša B., Ožanić N. (2017): Erosion Potential Method (Gavrilović method) sensitivity analysis. Soil & Water Res., 12: 51−59.In recent decades, various methods for erosion intensity and sediment production assessment have been developed. The necessity for better model performance has led to the more frequent application of the method sensitivity and uncertainty assessments in order to decrease errors that arise from the model concept and its main assumptions. The analysis presented in this paper refers to the application of the Gavrilović method (Erosion Potential Method), an empirical and semi-quantitative method that can estimate the amount of sediment production and sediment transport as well as the erosion intensity and indicate the areas potentially threatened by erosion. The emphasis in this paper is given upon the method sensitivity analysis that has not previously been conducted for the Gavrilović method. The sensitivity analysis was conducted for fourteen different parameters included in the method, all in relation to different model outputs. Each parameter was perceived and discussed individually in relation to its effect upon the method outputs, and ranked into categories depending on their influence on one or more model outputs. The objective of the analysis was to explore the constraints of the Gavrilović method and the method response to changes deriving from the each individual parameter in an attempt to provide a better understanding of the method, the weight and the contribution of each parameter in the overall method. The parameters that could potentially be used in future research, for method modification and calibration in areas with different catchment characteristics (e.g. climate, geological, etc.) were identified. The most sensitive model parameters resulting from conducted sensitivity analysis for the Gavrilović method are also those considered to be significant in the scientific literature on erosion. The Gavrilović method sensitivity analysis has been done on a case study for the Dubracina catchment area, Croatia.

Estimation of Sediment Yield and Maximum Outflow Using the IntErO Model in the Sarada River Basin of Nepal

“…φ is a coefficient that depends on the active erosion and degree of extension of the forms of linear erosion and mass movements. It is a factor without dimensional unit with values ranging from 0.1 to 1 [19,37,45]. In our study area, this parameter is evaluated based on the erosion pattern map of the Sarada river basin, and each type of erosion form has taken on a value of φ according to the guidelines of the EPM method [39][40][41].…”

Sediment Supply and Hydrogeological Hazard in the Quebrada de Humahuaca (Province of Jujuy, Northwestern Argentina)—Rio Huasamayo and Tilcara Area

“…The last version of the model, applied here, is the one proposed by Gavrilović [13] in 1988. Several authors have applied the method, especially in non-instrumented basins in the Mediterranean area [2,[14][15][16][17][18][19][20][21][22]. Nevertheless, a comparison with the PSIAC method [23,24] showed the same pattern for the predicted sediment yield, with a correlation coefficient of 0.95; it confirms the applicability of the EPM method for semi-arid and arid catchments [25,26].…”

Estimates of soil losses by the erosion potential method in tropical latosols

“…It is important to emphasize that despite the facility of EPM application, the accuracy of the data analyzed depends mainly on the experience and knowledge of the specialists who, based on field observations and sample data, determine the values of erosion coefficients, since the factors X a and Y present high sensitivity of variation, interfering decisively in the results provided by EPM (Shahabi et al, 2016;Dragičević;Karleuša;Ožanić, 2017).…”