Author(s): Md. Maruf Dustegir, Md. Rashedul Islam, Md. Munsur Rahman, Anisul Haque, Rezaul Karim, Gazi Riasat Amin, Lutfor Rahman, Motahar Hossain, Hajime Nakagawa, Yuji Hasegawa
Linked Author(s): Md. Maruf Dustegir
Keywords: Erosion, brahmaputra river, sedimentation, RCC spur, bandallings
Abstract: Brahmaputra River has one of the most active and dynamic fluvial system in the world and shifts its bank line continuously which causes land loss to thousands of people. Due to this phenomenon, the social and economic life of the people residing along Brahmaputra is highly vulnerable and unstable and hinders the gross development of that region. For comprehensive development to happen for the people, the incorporation of the dynamic behaviours of Brahmaputra with its morphological changes is needed. The aim of this study is to assess the bankline shifting during last few decades, the rate of change of the bank retreat and morphological response of the river before and after the installation of the bank protection structure (RCC spurs) with the help of time series analysis using remote sensing. Analysis shows that erosion rate of the study reach is 89. 9753 m/year which is between the year 1973 to 2016. Before the construction of protective structure the rate was 131. 907 m/year and after the installation of the structure it dropped to a rate of 3. 63667 m/year. This study also reveals the fact that the river is migrating westwards continuously during 1973 to 2016. Recently successful studies of bamboo bandalling for sediment management and land reclamation along the Jamuna River are executed. This explores the potential of such structures in protecting eroding bank of the current study site which will be used as a test case under the ongoing protect jointly funded by JST-JICA under SATREPS program
Year: 2017