Abstract
The channel of Bhagirathi River is the branches off from the Ganga at Nurpur (lower course of the Ganga). Bhagirathi River is one of the main rivers in Murshidabad district. Analyzing the image of the Bhagirathi River in Murshidabad district through the year 1970, 1977, 1990, 2000 and 2006, it is found that significant changed has been occurred in souththern part of the river and less change is found in the middle part which is close to the Berhampore town. Toposheet of the year 1970 is also compared with the image data to observe the change. Water discharge, soil types and transportation of sediment is the major contributing factor of morphological changes like bar or shoal, ox-bow Lake, meander etc. Maximum erosion takes place at Dear Balagachi and after Baidyanathpur. A cut-off has take place at Baidyanathpur in 1984 [1]. It is found from the study that there is a possibility of natural meander cut-off at Dear Balagachi and near Majayampur. The traditional bank protection works, concrete walls, cemented stone and brick, play a significant role in the modification of the hydraulic aspect of the discharge values and in the interference in the water dynamics of erosive and depositional phenomena both upstream and downstream.
Highlights
Meandering streams are one of the few morphological system for which an abundant historical record exists of changes of channel pattern and associated flood plain erosion and deposition
Analyzing the image of the Bhagirathi River in Murshidabad district through the year 1970, 1977, 1990, 2000 and 2006, it is found that significant changed has been occurred in souththern part of the river and less change is found in the middle part which is close to the Berhampore town
It is found from the study that there is a possibility of natural meander cut-off at Dear Balagachi and near Majayampur
Summary
Meandering streams are one of the few morphological system for which an abundant historical record exists of changes of channel pattern and associated flood plain erosion and deposition. Discussed the combines simulated bank erosion and channel migration. Such simulation modeling has both practical and theoretical utility for prediction of channel and floodplain changes, validation of theoretical process models, and increased understanding of the sedimentological structure of fluvial deposits with implication for groundwater flow. The model discussed here has three major components: (1) The model flow, bed topography, and sediment transport in meandering streams, (2) The component is a relationship between near-bank velocity and corresponding rates of bank erosion and lateral migration and (3) The marriage of a realistic model of meandering with floodplain sedimentation is the novel contribution. To propose the rational management for the abatement of erosion and protection for river bank
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