EFFECTS OF URBAN GROWTH ON THE INTENSIFICATION OF UNGWAN DANYARO GULLY EROSION, SAMARU, ZARIA, NIGERIA
EFFECTS OF URBAN GROWTH ON THE INTENSIFICATION OF UNGWAN DANYARO GULLY EROSION, SAMARU, ZARIA, NIGERIA
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Date
2015-11
Authors
ADEYINKA, Morenike
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Abstract
The study examines the effects of urban growth on the intensification of Ungwan Dayaro gully erosion in samara, Zaria. This was done with a view to map and describes urban expansion; to characterize gully growth in relation to human activities and to establish relationship between urban growth and the gully development. Topographical map of 1973 of scale 1:25,000 and Landsat images of 1980, 1996 and Google images of 2000 and 2015 were used to map the extent of urban growth and gully development. Arc 9.2 software was used to digitize the topographic maps of the decadian years, a Digital Elevation Model (DEM) was created and the elevation values was used to derive a cross section of nine selected gullies. Overlaying operation was carried out in order to establish the incremental growth in depth and width of the gullies and spatial growth of the study area. The result showed that the gullies differ one from another in depth and width; 1980 gullies were the shallowest while 2015 gullies were the deepest. The gullies also exhibited both “U” and V – shape. There was accelerated increase in the growth rate of the settlements from 1980 to 2015. The growth rate was 14% in1996, 40.9% in 2000 and 45.1% in 2015. The Product Moment Correlation co-efficient of 0.991 indicates that Urban growth have a significant influence on gully development in the study area. Urban growth due to increasing population and human activities such as agriculture, deforestation, construction, grazing and sand mining were identified as factors that have enhanced the development of gullies and this in turn has led to the destruction of building foundation and communication route and formation of bad land in the area. Enlightenment and awareness of erosion control should include land use habit of the people in the agricultural practice and care of vegetation. Stabilizing of gully is recommended in the area to reduce the impact or the force of rain drop. This will restrict the widening of incipient gullies. A holistic rehabilitation programmer of monitoring the
gully affected area to reclaim devastated land as well as to ensure a safe environment is also recommented.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FUFILLMENT FOR THE AWARD OF MASTER OF SCIENCE (M. Sc.) DEGREE IN GEOGRAPHY
DEPARTMENT OF GEOGRAPHY,
AHMADU BELLO UNIVERSITY, ZARIA,
NIGERIA
Keywords
EFFECTS,, URBAN GROWTH,, INTENSIFICATION,, UNGWAN DANYARO GULLY EROSION,, SAMARU,, ZARIA,, NIGERIA,