Title: Geomorphic Response to Land use Changes /Land Covers in Calabar River Basin, Cross River State, Nigeria
Author(s): ABALI T. P.
Abstract: Human-induced modifications of the vegetation cover in river basins may cause strong geomorphic responses by disturbing sediment supply, transport and deposition regimes. This research was set out to ascertain these geomorphic responses arising from Land Use Changes/Land Covers(LU/LC) that have taken place in Calabar river basin overtime(1980 to 2010). Two fundamental tools applied were GIS and remote sensing which were used for the assessment of LU/LC. Remote sensing provided multi temporal images, while GIS was used to analyze the data from a geographic perspective. Furthermore, field experiment was carried out in the area in order to assess the level of sediment yield using experimental plots for five land use types / plots: urban, farmland, grassland, bare and forest surfaces. The result of the analysis for LU/LCprovided six major classifications which include urban (built-up), water bodies, forest, farm, grass and bare surfaces. The built-up area and farmland land uses have increased tremendously (3.19% - 20.73%) and (10.20% - 23.79%) respectively; reductions in forest (35.85% - 24.84%), water bodies (8.77% - 5.27%), Grassland (24.68% - 12.67%) and bare land uses (17.31% - 12.69%).Similarly, the result of fieldwork conducted from all the five land use types, urban land use recorded the most significant amount of sediment loss (33.9kg), farmland (33.5kg), bare (28.8kg), grass (14.9kg)and forest (5.7kg) surfaces. The study revealed that urbanization is a major human activity to contend with in the region. To ameliorate hazards associated with urbanization, the study recommends among others monitoring of variables of sediment loss such as rainfall amount and intensity, infiltration capacity of the soil, slope length and gradient etc. by reforestation and creation of forest reserves.
Keywords: Geospatial Mapping, Land Use, Land Cover, River Basin, Sediment Yield

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