Assessment of Channel Planform Adjustments in the Mubi Section of River Yedzeram, Adamawa State, Northeastern Nigeria

Abstract

Recent changes in the channel planform of the Mubi section of River Yedzeram were examined using field studies and Geographical Information System Analysis. Changes resulting from channel widening, incision, meandering and lateral migration processes in the channel section were examined over a period of 13 years (2006 to 2019). Impacts of the occurring changes on riparian land uses were also assessed. Results showed an average channel widening of 8.48m; meandering (sinuosity) range of 1.51 to 1.58; meander bend lateral migration rates of 32.38m at 5.40m/year (from 2006 to 2012) and 27.80m at 3.97m/year (from 2012 to 2019). A short term (2016 to 2019) channel incision rate of 0.32m/year was also observed within the embanked section of the channel. Major affected land uses were irrigation farmlands and residential structures. Riparian buffer zones mapping and restriction policies against encroachment within the zones were recommended.