Characterisation of channel morphological pattern changes and flood corridor dynamics of the tropical Tana River fluvial systems, Kenya. (March 2020)

• Record Type: Journal Article
• Authors: Langat, Philip Kibet; Kumar, Lalit; Koech, Richard; Ghosh, Manoj Kumer
• Is Part Of: Journal of African earth sciences. Volume 163(2020)
• Publication Date: 2020-03
• Subjects: Fluvial geomorphology -- River restoration -- Channel planform changes -- Floodplain land cover/use -- Integrated remote sensing and GIS; Earth sciences -- Africa -- Periodicals; Earth sciences -- Middle East -- Periodicals; Geology -- Africa -- Periodicals; Geology -- Middle East -- Periodicals; Sciences de la terre -- Afrique -- Périodiques; Sciences de la terre -- Moyen-Orient -- Périodiques; Géologie -- Afrique -- Périodiques; Géologie -- Moyen-Orient -- Périodiques; Earth sciences; Geology; Africa; Middle East; Periodicals; Electronic journals; 556.05
• DOI: 10.1016/j.jafrearsci.2019.103748
• Languages: English
• ISSNs: 1464-343X

Abstract

Abstract: Historical morphological changes are useful tools for understanding river evolutionary trends and condition. This study characterised planform changes and floodplain dynamics of the Tana River fluvial systems, Kenya, between 1975 and 2017 using an integrated remote sensing and geographical information system (GIS) methodological framework. The river has witnessed significant alterations in channel morphology over a period of 42 years, indicating a highly active and meandering nature with a generally rising sinuosity in the downstream direction. The annual lateral river movement rate reduced significantly after the river regulation, which occurred between 1981 and 1988. Land cover change detection of the study reaches revealed tremendous spatial and temporal progressive disappearance of the riparian vegetation and dynamic channel morphological characteristics, trends that may continue in the coming years. The approach adopted in this study can be applied to other river reaches within study area with similar protocols or modifications according channel type and reach condition to provide water managers with evidence on the dynamic fluvial channel plan morphology for sustainable planning management and restoration activities. Highlights: A remote sensing and GIS methodological approach for characterising river channel dynamics. Tana River sinuosity is generally increasing in the downstream direction Land cover change detection reveals significant temporal dynamics over the last 30 years. The river shows a movement tendency towards the east direction.