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Please use this identifier to cite or link to this item: http://bsuir.bsum.edu.ng:8080/jspui/handle/11409/544

Title: THRESHOLDS ON ENVIRONMENTAL FACTORS OF GULLY EROSION IN KEREKE DRAINAGE BASIN OF THE BENUE TROUGH
Authors: SONGU, GODWIN AKAAYAR
Keywords: THRESHOLDS, ENVIRONMENTAL, GULLY EROSION
KEREKE DRAINAGE, BASIN
Issue Date: Aug-2019
Publisher: NONE
Citation: NONE
Abstract: Gully erosion is one of the serious environmental problems in the Kereke drainage basin, which has resulted in the destruction of farmlands, buildings among others. This study therefore established threshold values of environmental factors and develop predictive models for assessing gully characteristics in the Kereke drainage basin of the Benue trough. The systematic sampling procedure was used to select thirty-two settlements in the study area as catchment areas for data collection. Data on vegetation, soil, relief, gully characteristics were collected from direct field measurement, information on rainfall was sourced from NIMET office Makurdi and data on Kereke morphometric parameters and land use/land cover was sourced from Shuttle Radar Topographic Mission of the study area using GIS software, principles and techniques. Percentages and means were used to depict variations in the data set. Bivariate linear regression model and stepwise regression model were used to develop predictive models for assessing gully characteristics in the Kereke drainage basin. Findings of the study shows that the critical thresholds of 69% for vegetation cover, 5cm for depth of litter cover, 2o for valley slope angle, 71m for elevation above sea level, 0.3% for soil organic matter, 1.2gcm-3 for soil buck density and 38% for soil porosity are essential for gully initiation in the area. Also, models such as Y = 1.77 + 0.61x1 + 0.02x2 for gully intensity, Y = -0.06 +0.08x1 -0.97x2 – 0.05x3 + 0.01x4 + 0.20x5 for gully depth, Y = 21.13 – 2.43x1 + 0.12x2 + 0.01x3 for gully width and Y = 14.66 + 2.13x1 + 1.23x2 for gully length, are useful for predicting gully characteristics in the Kereke drainage basin. The significant factors of gully erosion in the study area are vegetation, soil erodibility, relief, runoff capacity, rainfall energy, drainage dissection, soil water holding capacity and human activities. It is therefore recommended that soil management should be encouraged especially shifting cultivation and fallowing system, to improving bulk density and vegetal cover for controlled gully initiation in the study area.
URI: http://bsuir.bsum.edu.ng:8080/jspui/handle/11409/544
Appears in Collections:Geography

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