Quantitative study on shoreline changes and Erosion Hazard assessment: case study in Muriganga–Saptamukhi interfluve, Sundarban, India

Abstract

Quantitative techniques, statistical methods and mathematical rules make the geospatial analysis more systematic, accurate and precise. In order to measure the intensity of the ongoing processes on the earth surface, evaluate the spatio-temporal changes in geographical attributes, highlight the principal factors for any geographic events and to identify the future possibilities, quantitative techniques are for most dependable. In the present article sequential changes of the shoreline, spatio-temporal extent of erosion and depositional processes of Sundarban region, West Bengal, India, have been measured following the selected quantitative techniques. The Sundarban is one of the most dynamic geomorphic units in the earth surface, situated in the northern apex of Bay of Bengal. The region has formed, sculptured and modified due to continuous sedimentation of the Ganga and the Brahmaputra systems, intense tidal hydro dynamic behavior, climatic disturbances and anthropogenic activities. In the last two century most of the parts of the active Sundarban delta has being reclaimed and occupied with dense rural settlements, most of the peoples are engaged in agriculture based rural economy, hence substantial erosion and successive regressive changes in the area have an unconstructive impact on the dwelling communities. In order to examine the net shoreline changes, average rate of end point changes and extent of erosion and depositional processes

Geo-historical Appraisal of Embankment Breaching and Its Management on Active Tidal Land of Sundarban: A Case Study in Gosaba Island, South 24 Parganas, West Bengal

“…It helps the planners as well as engineers to identify the most vulnerable zones in Gosaba, which are quite sensitive to embankment breaching because of active riverbank erosion. The methodology to identify vulnerable coastal zones is quite identical with the previous works of Gopinath and Seralathan (2005); Ghosh and Mukhopadhyay (2016). There are also some remarkable works regarding management strategies of embankment such as Ghosh et al(2015); Lakshmi and Edward (2010); Das et al (2012).…”

“…The rate and intensity of the river bank erosion also depend on various other factors like amount and frequency of water supply, sediment supply, geology, soil characteristics, vegetation cover and surface land-use system. Erosion zone has been identified through the superimposition of vectorised multi-temporal satellite images (Ghosh and Mukhopadhyay, 2016). The shoreline movement towards the river is identified as the depositional zone.…”

Process Form Responses of Shoreline Erosion Using Geo-Spatial Techniques: Case Study in Muriganga-Saptamukhi Interfluve, Sundarban

“…The concerned study focuses on the spatio-temporal changes of bank line shifting, extent of erosion and deposition along with erosion hazard zonation in western Sundarban using multi temporal maps and images (Table-1). The changing bank line configuration, extent of erosional and depositional patches have been extracted by imposing sequential digitized layers of successive periods (Bandyopadhyay and Bandyopadhyay, 1996;Bandyopadhyay et al, 2004;Raju et al, 2010;Mukhopadhyay et al, 2011;Rudra, 2012;Chakraborty, 2013;Das et al, 2013;Laha andBandyopadhyay, 2013 Bandyopadhyay et al, 2014;Ghosh and Mukhopadhyay, 2016). After that, the net areal changes of different geomorphic units have been calculated from the total amount of erosion and deposition (between 1925-26 and 2014) to identify different erosion prone areas.…”

Socio-Hydrological Approach to Explore Groundwater–Human Wellbeing Nexus: Case Study from Sundarbans, India

“…Geographically, the Indian Sundarbans region lies within 21 • 30 to 22 • 40 N latitude and 88 • 05 to 89 • 55 E longitude and is bounded by the Dampier and Hodges line from the northern side, the Hoogli River (a distributary of the river Ganges and a part of the Bhagirathi-Hoogli river channel) from the west, and Bangladesh from the east, while the Bay of Bengal demarcates the southern boundary. The Sundarbans deltaic complex is characterized by extensive sand flats, beaches, coastal dunes, and estuaries, while creeks, mudflats, and mangrove swamps are other important morphotypes [30,31]. The warm-humid climate is prevalent throughout the hydrological year with an average annual precipitation of around 1600 mm in the study area [26].…”