Erosion and Flood Vulnerability of Soils: A Climatic Challenge in Southern Nigeria

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Author(s) Romanus Obasi
Pages 675-684
Volume 2
Issue 9
Date September, 2013
Keywords Soil, erodebility, flood vulnerability, particle size.
Abstract

The soil erodebility and flood vulnerability of areas in the Southern Nigeria are studied using the climatic data for thirty six (36) years and fifteen soil/rock samples from erosion sites. The monthly mean rainfall and temperature data were subjected to linear regression and trend analysis. The result of the R2 regression method shows that the rainfall for Ikeja, Ibadan, Ondo, and Oshogbo areas varies from 1.2% to 4.5% in an increasing trend, an indication that the rainfall is not uniform over the years even though the temperature under the same condition indicates a decreasing trend. Similarly, the rainfall for Enugu, Umuahia and Owerri areas ranges between 0.6% and 5.2% in an increasing trend with temperature varying from 22.5% to 31.3% in a decreasing trend as well. The results of the particle size analyses for the soil/rock samples from erosion sites show three classifications in the following ranges; gravel 0.9%-1.7%,medium sand 69.3%-87.0% and fine sand 11.3%-29.0% respectively. This type of soil compositions from fine to medium grained favour the insurgence of erosion and by extension flooding under a continuous increasing trend of rainfall. Government is advised to adopt a proper urban management planning to avert flooding and its attendant unpleasant disasters.

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