Application of Erosion 2D Model for Erosion Studies in Makurdi Metropolis of Benue State, Nigeria

Abstract:

The equations of Erosion 2D Model (a physically based model) were transformed into a computer programme called EROSOFT and used to predict the rate of soil loss in Makurdi metropolis. The model has detachment, transport and deposition components. Four sites were chosen within the metropolis for this study. Soil samples were collected from the sites for laboratory analysis. Rainfall and runoff fluids were collected from the sites to determine their densities. Levelling instrument was used to detremine the channels slopes. The model predicted an average annual soil loss rate of 310kg m^-2s^-1 for the metropolis. The sensitivity analysis of the model indicates that straight slopes are more prone to soil erosion. The result of the model deviates slightly from established facts that, sandy soils are more erodible and hence prone to be easily detached. Nevertheless, the model shows that soil erosion is influenced by slope geometry and rainfall intensity. The study attributes the major causes of soil erosion in the city to urban runoff concentration and removal of vegetation, and therefore suggests the use of land grading, land forming and cover cropping as well as conservation structures like road side drains for the control of erosion in the metropolis.

• Periodical: Advanced Materials Research (Volume 367)
• Pages: 815-825
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.367.815
• Online since: October 2011
• Authors: M.O. Isikwue, T.G. Amile
• Keywords: Deposition, Detachment, Erosion, Runoff, Sediment, Transport Capacity

References

[1] A.M. Micheal and T. P Ojha: Principle of Agricultural Engineering. Vol. II. Jain Brothers, New Delhi (2006).

[2] T.G. Amile: Application of Erosion 2D model for Erosion studies in Makurdi Metropolis of Benue State. Unpublished B. Eng project work submitted to the Dept. Of Agricultural and Environmental Engineering, University of Agriculture Makurdi (2008).

DOI: 10.4028/www.scientific.net/amr.367.815

[3] A.T. Kumar, and S. Pradhan: Handbook of Agriculture, Indian Counsel of Agricultural Research, New Delhi. (2006).

[4] R. Lal: Soil Erosion, in: The Tropics Principle And Management, McGraw Hill, USA, (1990).

[5] C.O. Okonkwo: Rhetoric of Erosion in Anambra State, South Eastern Nigeria, Information on http/www. Nigeriavillagesquares. com. Assessed on 24 July (2008).

[6] L. H. Nwagozie: Probability and Statistics Engineering Practice, Prints Konzults. Lagos, (1999).

[7] J. Schmidt: A Mathematical Model to Simulate Rainfall Erosion, Catena supplement Vol. 19 (1991a), pp.101-109.

[8] J. Schmidt: Predicting the Sediment Yield from Agricultural Land using a New Soil Erosion Model, In: Proceeding of the 5th International Symposium on River so diwerutation (ICRS) Karlsruhe (1991b).

[9] J.D. Law: Measurement of the full velocity of water and Raindrops, Transaction of American Geophysical Union Vol. 21 (1991) pp.909-921.

[10] J.D. Law and D.A. Parsons: The Relation of Raindrop size to intensity, Transaction of American Geophysical Union Vol 24 (1943) pp.452-460.

[11] F. Hjulstorn: Studies of the Morphological Action of Rivers as illustrated by River Tyris, Bulletin of The University of Upsala, (1935).