Abstract
Increased population, unhealthy agricultural practices, indiscriminate land clearing and illegal structures have led to an increase of erosion in Nigeria and Lagos State in particular. This research focused on identifying land use/land cover changes in Eti-Osa LGA of Lagos State and estimating the actual erosion risk using Remote Sensing and Geography Information System. In addition, this research evaluated the perception of communities within the study area with the view to understanding the risk involved in erosion. Maximum Likelihood Algorithm was the classification method applied on the Landsat imageries (1986-2016) to identify the changes on the land use/land cover types. Analysis of Variance (ANOVA) was used to evaluate the perception of communities within the study area and Revised Universal Soil Loss equation (RUSLE) model was used to estimate the actual erosion risk. The result showed that the sediment yield of the study area was estimated to be between 0 to 48ton/ha/yr. The estimated soil losses were higher in Eti-Osa West compared to other parts of Iru/Victoria Island, and Ikoyi/Obalende areas which recorded low losses. Land uses mostly affected by very high and severe erosion are the bare soils and the crop lands having about 3% to 4% respectively. It can be concluded that rainfall, lack of cover for the surface soil were the major causes of soil loss in the study area.
Highlights
Coastal erosion is experienced in almost all the sections of Nigeria’s coastal zone, the quest for a lasting solution (Etuonovbe, 2006)
This research applied Remote Sensing and Geographic Information System (GIS) techniques in erosion risk modeling in Eti-Osa LGA
The Revised Universal Soil Loss equation (RUSLE) model was combined with Remote sensing (RS) and GIS techniques to analyze the annual average soil loss rates caused by the various factors which influence soil erosion: rainfall, soil erodibility, topographical factors and the cover and support practices within the study area and to evaluate the spatial distribution of soil loss rates under different land uses
Summary
Coastal erosion is experienced in almost all the sections of Nigeria’s coastal zone, the quest for a lasting solution (Etuonovbe, 2006). The social and economic consequences of coastal erosion can be substantial in many cases such as causing dis3placement of a whole community, including the loss of lives, loss of port facilities, infrastructures, recreational facilities, industrial and residential land due to coastal erosion as the case with Ogulaha community in Forcados South Point, Delta State, Nigeria (Etuonovbe, 2006). Certain important factors such as rainfall amount and precipitation intensity, which are called rainfall erosivity can results into soil erodibility IPCC (2007).The consequences of these have been reflected in the severe loss of lives and properties especially in Lagos State where the coastal zone contributes to a major part of the nation’s income (Etuonovbe, 2006). In urban areas like Lagos, population explosion, rapid urbanization, climate change, increased rainfall, poor agricultural practices etc. are factors that contribute to soil
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