ESTIMATION OF WATER EROSION OF A NIGERIAN GUINEA SAVANNA SOIL
ESTIMATION OF WATER EROSION OF A NIGERIAN GUINEA SAVANNA SOIL
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Date
1998-12
Authors
ADEWUMI, JOHNSON KAYODE
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Abstract
The possibility of establishing an equation for estimating soil loss in Samaru
- Zaria environment was investigated using measured values and two erosion
computer models.
Three experimental plots were established namely: bare soil, vegetated soil
and cultivated soil to measure soil detachment, soil loss and runoff on a storm by
storm basis at Ahmadu Bello University farm, Shika - Samaru during the 3 years
of study.
Soil detachment losses were measured by collecting all splash losses in a
25mm x 31mm hollow rectangular plastic container buried in the soil in a grid
pattern to catch soil splash at a maximum of one meter radius. Similarly, both
runoff and soil loss were also collected inside a drum buried at the end of each
plot.
The results indicate high erosion rate of 2.62 kg/m2/yr was measured for
bare soil on 5.8% slope while 1.15 kg/m2/yr was recorded as mean erosion rate for
vegetated plot on 6.6% slope. Slight over prediction of tested model was
experienced. However, the European Soil Erosion Model (EUROSEM) is
recommended for erosion prediction for bare and vegetated soil in Samaru - Zaria
environment, while the Water Erosion Prediction Project Model (WEPP) is
recommended for further experimentation in the southern part of Nigeria where a
substantial amount of rainfall per single storm normally occurs.
The study concludes with emphasis on using a soil conservation planning
guide of 2.7 kg/m2/yr erosion rate in Samaru - Zaria, Northern Guinea Savanna
zone of Nigeria.
Description
A Thesis Submitted to the Post Graduate School, Ahmadu Bello University,
Zaria in fulfilment of the Requirements for the Degree of Doctor of
Philosophy in Engineering.
Department of Agricultural Engineering
Faculty of Engineering
Ahmadu Bello University,
Zaria, Nigeria.
December, 1998.
Keywords
ESTIMATION,, WATER,, EROSION,, NIGERIAN,, GUINEA,, SAVANNA,, SOIL,