Comparative assessment of several rainfall erosivity indices in Southern Nigeria |
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| Institution: | 1. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China;2. Research Institute of Meteorological Science, Tianjin, 300074, China;1. Wroclaw University of Environmental and Life Sciences, Institute of Soil Science and Environmental Protection, Grunwaldzka 53, 50-357 Wroclaw, Poland;2. University of Bern, Institute of Geography, Hallerstrasse 12, 3012 Bern, Switzerland;3. University of Science and Technology, Department of Soil Science and Soil Protection, Bernardyńska 6, 85-029 Bydgoszcz, Poland;4. University of Wroclaw, Institute of Geological Sciences, Cybulskiego 32, 50-205 Wroclaw, Poland;5. Institute of Soil Science and Agrophysics, Department of Soil Science and Soil Protection, Agricultural University of Krakow, Mickiewicza 21,31-120 Krakow, Poland;1. Department of Geology, Palacký University of Olomouc, Tř. 17 listopadu 12, 77146 Olomouc, Czech Republic;2. Department of Geological Sciences, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic;1. Tianjin Academy of Environmental Sciences, 17 Fukang Road, Nankai District, Tianjin 300191, China;2. Tianjin Institute of Radioactive Environment Management, 17 Fukang Road, Nankai District, Tianjin 300191, China;3. Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan |
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| Abstract: | Soil erosion, measured in field runoff plots, was correlated with several rainfall erosivity indices. Erosion was measured on field plots established on a Typic Paleudult in southeastern Nigeria. Several erosivity indices were computed from a daily recording rain gauge sited in vicinity of the runoff plots. Erosivity indices computed included EI30 (WISCHMEIER & SMITH 1978), KE>1 (HUDSON 1971) and AIm (LAL 1976). In addition, several new indices were computed including EkIm and EkI30, where, the new kinetic energy (Ek) factor was computed using an empirical relation developed by KOWAL & KASSAM (1976) in northern Nigeria. Two new indices were slightly better correlated with soil erosion than the conventionally used indices. |
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