Growth and evolution of Mangaldeep and Gournagar channel bars in the Hooghly River, West Bengal, India
DOI:
https://doi.org/10.70035/ijarts.2022.1120-24Keywords:
Channel bar, Bar growth, River channel, Remote sensing, GIS techniqueAbstract
Channel bars are the most common landforms of the alluvial rivers and understanding their growth and evolution is very much i mportant. Bars play important roles for the riparian communities as they support ecologically and economically them with rich envir onments. Mangaldeep and Gournagar bars in the Hooghly River give appropriate environment to the riparian people by giving various opportunities for cultivation, fishing and live-stock development. In the present analysis an attempt has been made to assess the growth and development of the Mangaldeep and Gournagar chars over the last 30 years with the help of geospatial techniques. The identifi cation and changing pattern of bars were observed through remote sensing and GIS technique. The extensions of bars along the stretch of the Hooghly River have been digitized through the ArcGIS 10.5 software. The Mangaldeep char extended gradually from 1.75 hectare in 1990 through 41.2 hectare in 2000 through 62.76 hectare in 2010 to 73.83 hectare in 2020. Whereas the extension of the Gournagar char advanced from 381 hectare in 1990 with a slight increase of 1 hectare more in 2000. On the other hand the study revealed that in 2010 and 2020 the bar of Gournagar developed 440 hectare and 483 hectare respectively. The spatio-temporal analysis of selected channel bars and their evolution as well as the shifting will be helpful to understand the nature and characters of the river channel bars.
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