Stability Analysis of Brahmaputra Riverbank at Neulgaon

N.Sarma, P.Dutta

ARCGIS, Embankment, Erosion, River migration, Topography.

River bank erosion is a recurrent problem in Jorhat district of Assam. Most of the rivers in Jorhat are shifting in nature and thus river bank erosion is common. Erosion has lead to the general widening of the river and instability of the river banks. River migration and land degradation displaces large number of people annually. This study intends to investigate the nature of river erosion and provision of adequate structural measures. Hydrological data and topographical sheet gathered from government departments have been used as a basis for this project. Software analysis and chronological survey techniques are used for the measurement of channel migration and thus eroded distances. Based on software viz. ARCGIS, channel migration of the river Brahmaputra in Neulgaon, Jorhat is found out. Secondary data were also collected from the local residents to explain the erosion status. The geotechnical properties of the eroded site are important parameters for construction of anti-erosion structures. The design of a structure mainly depends on the topography, hydrological data, and the materials of construction, the mode of construction, and various dynamic properties of the soil. Engineering tests (Field work & laboratory work) has been performed to find its suitability as construction materials. Embankments are the oldest known forms of flood protection works and have been used extensively for this purpose. It is designed in accordance with BIS code 12094:2000. Stability check is then carried out to determine the safety factors.