Modelling approach for the rainfall erosivity index in sub-humid urban areas in northern Algeria
1Dept. d'Hydraulique. University, Abou Bakr Bel Kaid Tlemcen, Algeria
2Ecole Nationale Supérieure d'Hydraulique, Blida, MVRE, Algeria
Statistical models, specific erosion, sub-humid climate, urban hydrology, USLE
Abstract. This work presents an approach for storm water erosivity index modelling in the absence of measurement in an urban area, in a sub-humid climate. In torrential storms, floods, loaded with sediments, obstruct storm water drainage. With the aim of estimating the amount of sediment that can be deposited on a stretch of road, adjacent to the study area, the erosivity index is determined from a count of 744 rain showers recorded over a period of 19 years. The Universal Soil Loss Equation (USLE) of Wischmeier and Smith is applied, where only the index of erosivity is calculated; it is based on the intensity of the rain starting the process of erosion in the basin. Functional relations are required between this factor and the explanatory variables. A power type regression model is reached, making it possible to bring a decision-making aid in absences of measurements.
Touaibia, I., Abderrahmane Guenim, N., and Touaibia, B.: Modelling approach for the rainfall erosivity index in sub-humid urban areas in northern Algeria, Proc. IAHS, 364, 123-127, doi:10.5194/piahs-364-123-2014, 2014.