{"title":"The Effects of Rain and Overland Flow Powers on Agricultural Soil Erodibility","authors":"A. Moussouni, L. Mouzai, M. Bouhadef","volume":76,"journal":"International Journal of Geological and Environmental Engineering","pagesStart":229,"pagesEnd":233,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/1352","abstract":"The purpose of this investigation is to relate the rain\r\npower and the overland flow power to soil erodibility to assess the\r\neffects of both parameters on soil erosion using variable rainfall\r\nintensity on remoulded agricultural soil. Six rainfall intensities were\r\nused to simulate the natural rainfall and are as follows: 12.4mm\/h,\r\n20.3mm\/h, 28.6mm\/h, 52mm\/h, 73.5mm\/h and 103mm\/h. The results\r\nhave shown that the relationship between overland flow power and\r\nrain power is best represented by a linear function (R2=0.99). As\r\nregards the relationships between soil erodibility factor and rain and\r\noverland flow powers, the evolution of both parameters with the\r\nerodibility factor follow a polynomial function with high coefficient\r\nof determination. From their coefficients of determination (R2=0.95)\r\nfor rain power and (R2=0.96) for overland flow power, we can\r\nconclude that the flow has more power to detach particles than rain.\r\nThis could be explained by the fact that the presence of particles,\r\nalready detached by rain and transported by the flow, give the flow\r\nmore weight and then contribute to the detachment of particles by\r\ncollision.","references":"[1] Aggassi M.; Bradford J.M. (1999) \"Methodologies for interrill soil\r\nerosion studies\". Soil and Tillzge Research 49, pp: 277-287.\r\n[2] Bryan R.B. (2000) \"Soil erodibility and processes of water erosion on\r\nhillslope\". Geomorphology 32, pp: 385-415.\r\n[3] Gabet, E.J. and T. Dunne (2003) Sediment detachment by rain power,\r\n39, No 1, pp: 1-12.\r\n[4] Guy, B.J.;W.T.Dickinson and Rudra, R.P. (1990) \"Hydraulics of\r\nsediment-laden sheet flow and the influence of simulated rainfall\". Earth\r\nSurface Processes and Landforms, vol.15, pp: 101-118.\r\n[5] Kinnell, P.I.A. (1993) \"Runoff as a factor influencing experimentally\r\ndetermined interrill erodibilities\". Aust. Jour. Soil Resear. 31, pp: 333-\r\n342.\r\n[6] Li, G. (2009) \"Preliminary study of the interference of surface objects\r\nand rainfall in overland flow resistance\", Catena 78, pp: 154-158.\r\n[7] Morgan, R.P.C. (1977). \"Soil erosion in the United Kingdom: Field\r\nstudies in the Silsoe area, 1973-1975\". Silsoe Occasional paper, number\r\n4, 41p.\r\n[8] Moussouni, A., Mouzai L. and Bouhadef M. (2012) \"Laboratory\r\nexperiments: Influence of rainfall characteristics on runoff and water\r\nerosion\", Waset, 68, pp: 1540-1543.\r\n[9] Nearing M.A., L.D. Norton, D.A. Bulkakov, G.A. Larionov L.T. West,\r\nand K.M. Dontsova (1997) \"Hydraulics and erosion in eroding rills\".\r\nWater Resources Research, vol. 33, N\u252c\u25914, pp: 865-876.\r\n[10] Tan, S.K. (1989) \"Rainfall and soil detachment\". Jour. of Hyd. Res.\r\nVol.27 (5), pp: 699-715.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 76, 2013"}