2 nd International Conference on Advances in Civil Engineering 26 –28 Dec, 2014 CUET, Chittagong, Bangladesh Edited by: M.R.A.Mullick, M.R.Alam, M.S.Islam, M.O.Imam, M.J.Alam, S.K.Palit, M.H.Ali, M.A.R.Bhuiyan, S.M.Farooq, M.M.Islam, S.K.Pal, A.Akter, A.Hoque & G.M.S.Islam ______________________________________________________________________________________________________________________________________________________ _ 1083 ID: WRE 039 ANALYSIS OF RIVER BANK EROSION AND DEPOSITION OF KARNAFULI RIVER IN CHITTAGONG, BANGLADESH USING REMOTE SENSING AND GIS APPROACH Kutub Uddin Chisty 1* , Md. Ashraful Islam 1 & Md. Shahjalal Misuk 1 1 Department of Urban and Regional Planning, Chittagong University of Engineering and Technology, Chittagong-4349, Bangladesh. *Corresponding Author, <chisty_cuet10@yahoo.com> ABSTRACT An attempt has been made to analyse the bank erosion of Karnafuli River due to regular shifting of river channels by remote sensing approach. Twelve years interval data of Landsat TM & ETM+ Satellite image of 1989, 2001 & 2013, respectively are used to delineate the historical changes of the both bank alignment of the river course. Analysis also showed that last 2001 to 2013 years erosion rate was higher than 1989 to 2001 years and about 1191 feet was eroded. It is also most interpreted that erosion is higher than deposition and more dramatic changes may result from the formation of zig-zag courses. GIS and remote sensing are used to correlate temporal and spatial information so that a comparative analysis has been analyzed among shorelines of different years and tentative changing morphology of the flashy Karnafuli River. Keywords: River shoreline, Satellite images and GIS INTRODUCTION Bank erosion and channel shifting of the untrained alluvial rivers of Bangladesh are major problems to the socio-economic and environmental sectors of the country (Ahmed, 1989). Generally, river bank erosion or deposition is mechanism of sediment transportation or carrying away the bank materials of the river by itself and it affects the river channel courses (Biswajit, et al., 2013). Moreover, it stated that fluvial geomorphic process is very much active most of rivers in Bangladesh. As a result, river erosion is also common in the study area, Karnafuli River. This paper focused on erosion and deposition considering the shifting river shore lines from satellite images of Karnafuli river area. Moreover, Shoreline evolution is the change in shore position during a time scale. In fact, it is the material resistance of the coastal geologic underpinnings against the impinging hydrodynamic forces (Alam, 1991). Most of the change from 1989 year to 2013 year in shore positions will be quantified in this paper only. Thus the erosion and deposition has been clarified by the shifting pattern of shorelines through the satellite images interpolation. MATERIALS AND METHODOLOGY To analysis erosion and deposition scenarios of the study area from 1989-2013 by Landsat TM and ETM+ Satellite images and finally GIS approach was adopted, the data of river left bank line is extracted from the same time satellite imagery at different years from US Geological Survey. Fixed in eye altitude of 150 km selecting the study area, 30×30 meter resolution of landslide satellite imagery was acquired from Google Earth-6.2v (table 1). Geographic Information systems (GIS) and Remote Sensing (RS) were used in data encoding and analysing purposes. ArcGIS 9.3 and ERDAS Imagine 10.1 version software and human interpretation have been used in extracting the data from 1989, 2001 and 2013 remote sensing images. Different shape file layers (i.e. District, Upazila, Union Boundary, River, Char land and River Shoreline) for vector data were created and assigned projection in each shape file in the ArcGIS (Arc Catalog) environment. Digitization was performed to collect shoreline