Model Development for Quantifying and Predicting Rainfall Induced
Erosion in Tropics Region using Dimensional Equation approach
Abstract
Erosion and sedimentation has a serious problem over the year
especially in semi arid where soil is loose and in addition torrential
rainfall. The need to develop a specissessment of rainfall induced soil
erosion and sediment yield model is necessary.. Data was collected
between 2018&2019 which was used to develop a dimensionless model for
predicting Rainfall-induced erosion using the dimensional analyses
approach. Factors used include; Soil infiltration rate, Soil erodibility
factor, Hydraulic shear stress, Soil grain diameter, Depth of tilt Mean
diameter of raindrop, Rainfall intensity, Rainfall duration, Gully size,
and Density of soil Runoff velocity.The model produced reasonable
predictions relative to field measurements with coefficient of
determination R²of 0.768, the variables in the model are easily
measurable; this makes it better and easily adoptable. It is recommended
to use locally developed model using specific local data.